thebmjBMJ2015;351:h3978 doi: 1 0.1136/bmj.h3978 RESEARCH 1 OPEN ACCESS Department oClinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada Chanchlani Research Centre, McMaster University, Hamilton, ON, Canada Department oNutritional Sciences, University oToronto, Toronto, ON, Canada Clinical Nutrition and Risk Factor Modification Center, St Michael’s Hospital, Toronto, ON, Canada Population Health Research Institute, Hamilton Health Sciences, Hamilton, ON, Canada Scotiabank Health Sciences Library, St Michael’s Hospital, Toronto, ON, Canada Hospital Library and Archives, Hospital or Sick Children, Toronto, ON, Canada Department oMedicine, McMaster University, Hamilton, ON, Canada Correspondence to: S Anand, McMaster University, Main St W, MDCL-, Hamilton, ON LN Z, Canada [email protected]Additional material is published online only. To view please visit the journal online (ht tp:// dx.doi. org/./bmj.h) Cite this as: BMJ;:hdoi: ./bmj.hAccepted: July Intake of saturated and trans unsaturated fatty acids and risk of all cause mortality, cardiovascular disease, and type 2 diabetes: systematic review and meta-analysis of observational studies Russell J de Souza, , , , Andrew Mente, , , Adriana Maroleanu, Adrian I Cozma, , Vanessa Ha, , , Teruko Kishibe, Elizabeth Uleryk, Patrick Budylowski, Holger Schünemann, , Joseph Beyen e, , Sonia S Anand , , , ABSTRACT OBJECTIVE To systematically review associations between intake of saturated fat and trans unsaturated fat and all cause mortality, cardiovascular disease (CVD) and associated mortality, coronary heart disease (CHD) and associated mortality, ischemic stroke, and type diabetes. DESIGN Systematic review and meta-analysi s. DAT A SOU RCES Medline, Embase, Cochrane Central Registry of Controlled Trials, Evidence-Based Medicine Reviews, and CINAHL from inception to May , supplemente d by bibliographies of retrieved articles and previous reviews. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Observational studies reporting associations of saturated fat and/or trans unsaturated fat (total, industrially manufacture d, or from ruminant animals) with all cause mortality, CHD/CVD mortality, total CHD, ischemic stroke, or type diabetes. DATA EXTRACTION AND SYNTHESIS Two reviewers independently extracted data and assessed study risks of bias. Multivariable relative risks were pooled. Heterogeneity was assessed and quantified. Potential publication bias was assessed and subgroup analyses were undertaken. The GRADE approach was used to evaluate quality of evidence and certainty of conclusions. RESULTS For saturated fat, three to prospective cohort studies for each association were pooled (five to comparisons with -participants). Saturated fat intake was not associated with all cause mortality (relative risk ., % confidence interval .to .), CVD mortality (., .to .), total CHD (., .to .), ischemic stroke (., .to .), or type diabetes (., .to .). There was no convincing lack of association between saturated fat and CHD mortality (., .to .; P=.). For trans fats, one to six prospective cohort studies for each association were pooled (two to seven comparisons with -participants). Total trans fat intake was associated with all cause mortality (., .to .), CHD mortality (., .to .), and total CHD (., .to .) but not ischemic stroke (., .to .) or type diabetes (., .to .). Industrial, but not ruminant, trans fats were associated with CHD mortality (.(.to .) v.(.to .)) and CHD (.(.to .) v.(.to .)). Ruminant trans-palmitoleic acid was inversely associated with type diabetes (., .to .). The certainty of associations between saturated fat and all outcomes was “very low.” The certainty of associations of trans fat with CHD outcomes was “moderate” and “very low” to “low” for ot her associations. CONCLUSIONS Saturated fats are not associated with all cause mortality, CVD, CHD, ischemic stroke, or type diabetes, but the evidence is heterogeneous with methodological limitations. Trans fats are associated with all cause mortality, total CHD, and CHD mortality, probably because of higher levels of intake of industrial trans fa ts than ruminant trans fats. Dietary guidelines must carefully consider the health effects of recommendations for alternative macronutrients to replace trans fats and saturated fats. Introduction Recent high profile opinion pieces, informed by system- atic reviews of randomized trials and prospective cohort studies, have called for a re-evaluation of dietary guidelines for intake and a re-appraisal of the effects of saturated fat on health; during this time pub- lic health efforts to remove trans fats from the food sup- ply in several countries have intensified. Saturated fats contribute about % of energy to the North American diet. The main sources of saturated WHAT IS ALREADY KNOWN ON THIS TOPIC Contrary to prevailing dietary advice, authors of a recent systematic review and meta-analyses claim that there is no excess cardiovascular risk associated with intake of saturated fat, and the US has recently taken policy action to remove partially hydrogenated vegetable oils from its food supply Population health guidelines require a careful review and assessment of the evidence of harms of these nutrients, with a focus on replacement nutrients WHAT THIS STUDY ADDS This study reviewed prospective observational studies and assessed the certainty of the associations with GRADE methods There was no association between saturated fats and health outcomes in studies where saturated fat generally replaced refined carbohydrates, but there was a positive association between total trans fatty acids and health outcomes Dietary guidelines for saturated and trans fatty acids must carefully consider the effect of replacement nutrients
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7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 116thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
1
OPEN ACCESS
983089Department o ClinicalEpidemiology and BiostatisticsMcMaster University HamiltonON Canada983090Chanchlani Research CentreMcMaster University HamiltonON Canada983091Department o NutritionalSciences University o TorontoToronto ON Canada983092Clinical Nutrition and Risk FactorModification Center St MichaelrsquosHospital Toronto ON Canada983093Population Health ResearchInstitute Hamilton HealthSciences Hamilton ON Canada983094Scotiabank Health SciencesLibrary St Michaelrsquos HospitalToronto ON Canada983095Hospital Library and ArchivesHospital or Sick ChildrenToronto ON Canada983096Department o MedicineMcMaster University HamiltonON Canada
Correspondence to S AnandMcMaster University 983089983090983096983088 MainSt W MDCL-983091983090983088983092 Hamilton ONL983096N 983091Z983093 Canadaanandsmcmasterca
Additional material is publishedonline only To view please visit
the journal online (ht tpdxdoiorg983089983088983089983089983091983094bmjh983091983097983095983096)
Cite this as BMJ 983090983088983089983093983091983093983089h983091983097983095983096doi 983089983088983089983089983091983094bmjh983091983097983095983096
Accepted 983089983093 July 983090983088983089983093
Intake of saturated and trans unsaturated fatty acids and risk of
all cause mortality cardiovascular disease and type 2 diabetes
systematic review and meta-analysis of observational studies
Russell J de Souza983089 983090 983091 983092 Andrew Mente983089 983090 983093 Adriana Maroleanu983090 Adrian I Cozma983091 983092 Vanessa Ha983089 983091 983092 Teruko Kishibe983094 Elizabeth Uleryk983095 Patrick Budylowski983092 Holger Schuumlnemann983089 983096 Joseph Beyene983089 983090 Sonia S Anand983089 983090 983093 983096
ABSTRACT
OBJECTIVE
To systematically review associations between intake
of saturated fat and trans unsaturated fat and all cause
mortality cardiovascular disease (CVD) and associated
mortality coronary heart disease (CHD) and associated
mortality ischemic stroke and type 983090 diabetes
DESIGN
Systematic review and meta-analysisDATA SOURCES
Medline Embase Cochrane Central Registry of
Controlled Trials Evidence-Based Medicine Reviews
and CINAHL from inception to 983089 May 983090983088983089983093
supplemented by bibliographies of retrieved articles
and previous reviews
ELIGIBILITY CRITERIA FOR SELECTING STUDIES
Observational studies reporting associations of
saturated fat andor trans unsaturated fat (total
industrially manufactured or from ruminant animals)
with all cause mortality CHDCVD mortality total CHD
ischemic stroke or type 983090 diabetes
DATA EXTRACTION AND SYNTHESISTwo reviewers independently extracted data and
assessed study risks of bias Multivariable relative
risks were pooled Heterogeneity was assessed and
quantified Potential publication bias was assessed
and subgroup analyses were undertaken The GRADE
approach was used to evaluate quality of evidence and
certainty of conclusions
RESULTSFor saturated fat three to 983089983090 prospective cohort studies
for each association were pooled (five to 983089983095
comparisons with 983097983088 983093983088983089-983091983091983097 983088983097983088 participants)
Saturated fat intake was not associated with all cause
983088983097983089 to 983089983088983097) CVD mortality (983088983097983095 983088983096983092 to 983089983089983090) total
CHD (983089983088983094 983088983097983093 to 983089983089983095) ischemic stroke (983089983088983090 983088983097983088 to
983089983089983093) or type 983090 diabetes (983088983097983093 983088983096983096 to 983089983088983091) There was
no convincing lack of association between saturatedfat and CHD mortality (983089983089983093 983088983097983095 to 983089983091983094 P=983088983089983088) For
trans fats one to six prospective cohort studies for
each association were pooled (two to seven
comparisons with 983089983090 983097983092983090-983090983091983088 983089983091983093 participants) Total
trans fat intake was associated with all cause mortality
(983089983091983092 983089983089983094 to 983089983093983094) CHD mortality (983089983090983096 983089983088983097 to 983089983093983088)
and total CHD (983089983090983089 983089983089983088 to 983089983091983091) but not ischemic
stroke (983089983088983095 983088983096983096 to 983089983090983096) or type 983090 diabetes (983089983089983088 983088983097983093
to 983089983090983095) Industrial but not ruminant trans fats were
associated with CHD mortality (983089983089983096 (983089983088983092 to 983089983091983091) v 983089983088983089
(983088983095983089 to 983089983092983091)) and CHD (983089983092983090 (983089983088983093 to 983089983097983090) v 983088983097983091 (983088983095983091
to 983089983089983096)) Ruminant trans-palmitoleic acid was inversely
associated with type 983090 diabetes (983088983093983096 983088983092983094 to 983088983095983092)The certainty of associations between saturated fat
and all outcomes was ldquovery lowrdquo The certainty of
associations of trans fat with CHD outcomes was
ldquomoderaterdquo and ldquovery lowrdquo to ldquolowrdquo for other
associations
CONCLUSIONS
Saturated fats are not associated with all cause
mortality CVD CHD ischemic stroke or type 983090
diabetes but the evidence is heterogeneous with
methodological limitations Trans fats are associated
with all cause mortality total CHD and CHD mortality
probably because of higher levels of intake of
industrial trans fats than ruminant trans fats Dietary
guidelines must carefully consider the health effects of
recommendations for alternative macronutrients to
replace trans fats and saturated fats
Introduction
Recent high profile opinion pieces informed by system-
atic reviews of randomized trials983089 983090 and prospective
cohort studies983089 983091 have called for a re-evaluation of
dietary guidelines for intake and a re-appraisal of the
effects of saturated fat on health during this time pub-
lic health efforts to remove trans fats from the food sup-
ply in several countries have intensified
Saturated fats contribute about 983089983088 of energy to theNorth American diet983092 983093 The main sources of saturated
WHAT IS ALREADY KNOWN ON THIS TOPIC
Contrary to prevailing dietary advice authors of a recent systematic review and
meta-analyses claim that there is no excess cardiovascular risk associated with
intake of saturated fat and the US has recently taken policy action to remove
partially hydrogenated vegetable oils from its food supply
Population health guidelines require a careful review and assessment of the
evidence of harms of these nutrients with a focus on replacement nutrients
WHAT THIS STUDY ADDS
This study reviewed prospective observational studies and assessed the certainty
of the associations with GRADE methods
There was no association between saturated fats and health outcomes in studies
where saturated fat generally replaced refined carbohydrates but there was a
positive association between total trans fatty acids and health outcomes
Dietary guidelines for saturated and trans fatty acids must carefully consider theeffect of replacement nutrients
fatty acids in the food supply are animal products such
as butter cowsrsquo milk meat salmon and egg yolks and
some plant products such as chocolate and cocoa butter
coconut and palm kernel oils Previous meta-analyses
of prospective cohort studies reported pooled relative
risk estimates comparing extremes of intake of saturated
fat of 983089983088983095 (983097983093 confidence interval 983088983097983094 to 983089983089983097 P=983088983090983090)
for coronary heart disease (CHD) 983088983096983089 (983088983094983090 to 983089983088983093
P=983088983089983089) for stroke and 983089983088983088 (983088983096983097 to 983089983089983089 P=983088983097983093) for car-
diovascular disease (CVD)983094 Intervention trials have
shown modest cardiovascular benefits of reducing
intake of saturated fat while increasing intake of polyun-
saturated fat983095 but most trials lasted only up to two years
and examined surrogate outcomes A meta-analysis of
randomized trials suggested a 983089983095 reduction in risk of
CVD in studies that reduced saturated fat intake from
about 983089983095 to about 983097 of energy (983088983096983091 983088983095983090 to 983088983097983094)983096
Trans fats contribute about 983089-983090 of energy in the
North American diet983097-983089983089 and are produced industrially
through partial hydrogenation of liquid plant oils in the
presence of a metal catalyst vacuum and high heat or
can occur naturally in meat and dairy products where
ruminant animals biohydrogenate unsaturated fatty
acids via bacterial enzymes The major industrially
produced trans fatty acids in the food supply are elaidic
acid isomers and the major ruminant derived trans
fatty acid is vaccenic acid both share the characteristic
of having at least one double bond in the ldquotrans-rdquo rather
than ldquocis-rdquo configuration A prior meta-analysis
reported pooled relative risk estimates of CHD of 983089983090983090
(983097983093 confidence interval 983089983088983096 to 983089983091983096 P=983088983088983088983090) for
extremes of total intake of trans fats 983089983091983088 (983088983096983088 to 983090983089983092
P=983088983090983097) for intake of industrially produced trans fats
and 983088983097983091 (983088983095983092 to 983089983089983096 P=983088983093983094) for intake of ruminantderived trans fats983089983090 suggesting that industrially pro-
duced trans fats might increase the risk of CHD though
this could also reflect the low levels of ruminant derived
trans fats compared with the higher doses of industri-
ally produced trans fats typically consumed in studies
and available in the food supply983089983091
Dietary guidelines recommend that saturated fats
should be limited to lt983089983088 (983093-983094 for those who would
benefit from lowering of LDL cholesterol) and trans fats
to lt983089 of energy or as low as possible983089983092-983089983097 primarily to
reduce risk of ischemic heart disease and stroke To
clarify controversies surrounding guidelines for satu-
rated and trans fats for adults we have extended andupdated previous work to synthesize prospective asso-
ciations between these fats and all cause mortality and
type 983090 diabetes (which have not been previously synthe-
sized) separate estimates for risks of cardiovascular
morbidity and mortality and assess the confidence in
the observational evidence using the Grading of Recom-
mendations Assessment Development and Evaluation
(GRADE) approach983090983088-983090983090
Methods
This review was conducted in accordance with the
WHOrsquos guideline development process983090983091 based on the
Cochrane Collaboration approach983090983092 and reportedaccording to the MOOSE checklist983090983093
Data sources
We conducted independent searches for relevant
observational studies assessing the association
between saturated andor trans fats and health out-
comes up to 983089 May 983090983088983089983093 (appendix 983089 gives full details)
This included searching Medline (from 983089983097983092983094) Embase
(from 983089983097983095983092) Cochrane Central Registry of Controlled
Trials (from 983089983097983097983094) Evidence Based Medicine Reviews
(from 983089983097983097983094) and CINAHL (from 983089983097983096983091) Reference lists of
retrieved articles and previous systematic and narra-
tive reviews983089 983089983090 983090983094-983090983097 were hand searched There were no
language restrictions
Study selection
Eligible studies included any observational study con-
ducted in humans (such as prospective cohort
case-control nested case-control or case-cohort
design) that reported a measure of association (such as
hazard ratios or incident rate ratios for prospective
studies or odds ratios for retrospective studies)
between intakes of saturated or trans fat measured by
self report or a biomarker and all cause mortality coro-
nary heart disease stroke or type 983090 diabetes measured
by self report andor confirmed by medical records or
registry linkage One reviewer assessed titles and
abstracts of all studies identified through electronic
searches Potentially eligible studies were reviewed
independently by a second reviewer with discrepan-
cies resolved by discussion and when necessary a
senior author was consulted to reach consensus
Data extraction
Pairs of authors independently extracted details of the
study design country of conduct exposure and out-come assessment participant characteristics and sta-
tistical analyses including adjustment for confounders
from included studies using pretested instruments (see
appendix 983089) with discrepancies resolved by discussion
Authors were contacted for additional data when nec-
essary We used Plot Digitizer (httpplotdigitizer
sourceforgenet) to extract numerical estimates from
graphs
Assessment of trans fats exposure methods
To assess the accuracy of measures of trans fats in stud-
ies that did not directly measure concentrations in
blood or adipose tissues we assessed the potential formisclassification The lowest risk of misclassification
was for those studies that used a food frequency ques-
tionnaire validated against multiple day prospective
diet records or 983090983092 hour recalls directly measured adi-
pose tissue trans fatty acids in a subset of the popula-
tion and analyzed dietary intake with an updated
database of foods A study was rated as at low risk of
misclassification if it accomplished all three moderate
risk of misclassification) if it accomplished two of three
high risk of misclassification if it accomplished one of
three or at very high risk of misclassification if it did
not accomplish any For assessment of ruminant trans
fats the most common approach was to use the knownnutrient composition from food tables for dairy and
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RESEARCH
3
meat products to estimate ruminant trans fats and pos-
sibly supplemented by direct measurement with gas
chromatography (see eTable 983089 in appendix 983090)
Study risk of bias
We used the Newcastle-Ottawa scale983091983088 to assess the risk
of bias of the included studies on the basis of selection
of study groups comparability of groups and ascer-
tainment of exposure(s) or outcome(s)
Grading of recommendations assessment
development and evaluation (GRADE)
The GRADE approach was used to assess the confi-
dence in the effect estimates derived from the body of
evidence (quality of evidence) by outcome and pro-
duce evidence profiles983090983088-983090983090 We limited the presenta-
tions of results in the main text to the synthesis of
prospective cohort studies as these are considered the
highest level of evidence for observational studies and
thus were used for the GRADE assessments of confi-
dence Appendix 983091 provides full details of designs that
did not directly inform GRADE (that is retrospective
case-control studies and other studies not amenable
to quantitative synthesis) All investigators discussed
and reviewed evidence summaries and GRADE assess-
ments which were reviewed with the WHO Nutrition
Guidance Expert Advisory Group (NUGAG) subgroup
on diet and health as part of WHOrsquos guideline develop-
ment process Confidence in the estimate of each asso-
ciation was categorized into four levels from very low
to high
Data synthesis and analysis
Statistical synthesis o effect estimatesThe principal association measures were the risk ratios
between extreme levels of intake (highest v lowest) for
prospective studies and the odds ratio between extreme
levels of exposure (highest v lowest) for retrospective
studies For each study we calculated most adjusted
(that is the multivariable association measure with the
highest number of covariates) and least adjusted (that
is the multivariable association measure with the few-
est number of covariates) estimates and corresponding
983097983093 confidence intervals for each outcome We
extracted both estimates to assess whether relevant
confounders (such as smoking age) and intermediate
variables (such as LDL cholesterol blood pressure)were captured in the statistical models Analyses that
adjust for potential confounders and intermediate vari-
ables will generally represent conservative estimates of
the strength of the associations and analyses that do
not adjust for these will generally reflect the effect not
only of exposure to fat but of other determinants of the
health outcomes We present both models to assess the
impact of these variables on the reported association
When at least two studies provided data we performed
a DerSimonian and Laird random effects meta-analysis
which yields conservative confidence intervals around
relative risks in the presence of heterogeneity983091983089 When
three or fewer studies were combined we also consid-ered fixed effect estimates
Heterogeneity
Heterogeneity was determined with Cochranrsquos Q test
(significant at Plt983088983089983088) quantified with the I983090 statistic
(range from 983088-983089983088983088)983091983090 and used to assess inconsis-
tency as part of the GRADE assessment of evidence
quality If ge983089983088 studies were available983091983091 983091983092 and heteroge-
neity was substantial (I983090gt983094983088 or PQlt983088983089983088)983091983090 we used
meta-regression to explore heterogeneity by baseline
year of study continent of conduct length of follow-up
median age of participants proportion of smokers in
the sample amount of saturated fat in reference cate-
gory mean saturated or trans fat intake of the popula-
tion sex α-linoleic acid total polyunsaturated fat
adjustment for total energy method and frequency of
exposure assessment risk of bias score and adjust-
ment for lipids or blood pressure (that is causal inter-
mediates)
Sensitivity
We carried out four a priori sensitivity analyses We
removed each single study from the meta-analyses and
recalculated the summary association (the ldquoleave one
outrdquo approach)983091983093 removed studies with scores lt983095 on
the Newcastle-Ottawa scale and recalculated the
pooled association included unpublished data on
trans fats and CHD mortality (P Knekt personal com-
munication) and removed risk estimates imputed
because of incomplete reporting A study whose
removal either pushed the significance level of the
overall association from lt983088983088983093 to ge983088983088983093 (or vice versa)
or altered the nominal effect size by 983089983088 or more was
considered an influential outlier At the request of the
For saturated fats and total CHD983092983092 983092983097-983094983090 the summary
most adjusted multivariable risk ratio was 983089983088983094 (983097983093
confidence interval 983088983097983093 to 983089983089983095 P=983088983090983097 I983090=983092983095Phet=983088983088983090) (fig 983090 appendix 983092 eFigure 983093) As risk esti-
mates from three comparisons983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these three comparisons
resulted in a summary risk ratio of 983089983088983096 (983088983097983095 to 983089983090983088
P=983088983089983096 I983090=983093983089 Phet=983088983088983089) The summary least adjusted
relative risk was 983089983089983090 (983089983088983088 to 983089983090983094 P=983088983088983093 I983090=983094983091
Phetlt983088983088983088983089) (appendix 983092 eFigure 983094) No study was an
influential outlier
For saturated fats and ischemic stroke983092983095 983093983091 983093983095 983093983096 983094983089 983094983091-983095983088
the summary most adjusted multivariable risk ratio was
983089983088983090 (983097983093 confidence interval 983088983097983088 to 983089983089983093 P=983088983095983097
I983090=983093983097 Phet=983088983088983088983090) (fig 983090 appendix 983092 eFigure 983095) As riskestimates for four comparisons983092983095 983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these four comparisons
resulted in a summary risk ratio of 983089983088983091 (983088983096983097 to 983089983089983097
P=983088983094983096 I983090=983094983094 Phetlt983088983088983088983089) The summary least
adjusted risk ratio was 983089983088983091 (983088983097983089 to 983089983089983094 P=983088983094983093 I983090=983094983094
Phetlt983088983088983088983089) (appendix 983092 eFigure 983096) No study was an
influential outlier
Type 983090 diabetes
For saturated fats and type 983090 diabetes983095983089-983095983095 983095983096 the sum-
mary most adjusted multivariable risk ratio was 983088983097983093
(983097983093 confidence interval 983088983096983096 to 983089983088983091 P=983088983090983088 I983090=983088Phet=983088983094983089) (fig 983090 appendix 983092 eFigure 983097) The summary
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Prospective cohort studies (n=) Case-control studies (n=) Pooling study (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Excluded (n=)
Did not assess saturated fat exposure (n=) Did not measure outcome(s) of interest (n=) Duplicate data from previous publication (n=) Did not present a measure of association (n=) Inappropriate study design (abstracts cross sectional studies reviews) (n=)
Fig 983089 | PRISMA summary of evidence search and selection for saturated fat and healthoutcomes (up to 983089 May 983090983088983089983093)
7232019 journal 2 newpdf
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RESEARCH
5
least adjusted risk ratio was 983089983090983091 (983088983097983096 to 983089983093983090 P=983088983088983095
I983090=983097983089 Phetlt983088983088983088983089) (appendix 983092 eFigure 983089983088) No study
was an influential outlier
Trans fats and health outcomes
Literature low
We identified 983089983096 983096983091983093 potentially eligible articles (fig 983091 )
After full text review 983090983088 primary reports of associa-
tions between total trans fats and the health outcomes
in prospective cohort studies (published between 983089983097983097983094
and 983090983088983089983093) provided 983090983096 data points that contributed to
the quantitative synthesis Cohorts were enrolled from
the US (983089983092 studies 983089983097 data points) Finland (four stud-
ies six data points) China (one study one data point)
and the Netherlands (one study two data points)
One systematic review contributed one data point
from a previously unpublished prospective cohort
study983089983090 and one author provided updated unpub-
lished data from the Finnish Mobile Health clinics
(P Knekt personal communication) Four primary
reports of associations between industrial trans fats
and the health outcomes (published between 983089983097983097983091 and
983090983088983089983091) provided four data points that contributed to the
quantitative synthesis Cohorts were enrolled from the
US (one study one data point) Finland (one study
one data point) the Netherlands (one study one data
point) and Norway (one study one data point) Nine
primary reports of associations between ruminant
trans fats and the health outcomes (published
between 983089983097983097983091 and 983090983088983089983093) provided 983089983091 data points that
contributed to the quantitative synthesis Cohorts
came from the US (five studies five data points) Nor-
way (one study four data points) Finland (one studyone data point) Denmark (one study two data points)
and the Netherlands (one study one data point)
Appendix 983090 shows full study characteristics in eTable
983089983089 for prospective cohort studies eTable 983089983090 for retro-
spective case-control studies eTable 983089983091 for nested
case-control or case-cohort studies and eTables 983093 and
983094 for scores on the Newcastle-Ottawa scale Summaries
of results for case-control studies nested case-control
studies dose-responsesubstitution relations and
studies that did not inform the GRADE evidence table
are presented in appendix 983091 We use the term ldquototal
trans fatsrdquo to refer to the estimate of exposure to all
trans fats whether industrially produced or ruminantderived and present specific associations of industri-
ally produced and ruminant derived trans fats with
health outcomes separately when available The spec-
ificity of trans fat measurement provided by each study
is presented in appendix 983090 eTables 983089 983089983089 983089983090 and 983089983091
All cause mortality
The pooled random effects most adjusted multivariable
risk ratio of high versus low total intake of trans unsatu-
rated fatty acid estimated from two published reports983092983090 983095983097
(two comparisons) including 983090983089983092983089 deaths in 983090983088 983091983092983094
individuals was 983089983092983090 (983097983093 confidence interval 983089983088983092 to 983089983097983092
P=983088983088983091) with some evidence of heterogeneity betweenstudies (I983090=983095983088 Phet=983088983088983095) appendix 983092 eFigure 983089983089)
All cause mortality
CHD mortality
CVD mortality
CHD total
Ischemic strokeType diabetes
( to )
( to )
( to )
( to )
( to ) ( to )
Outcome
Saturated fatsprotective
Saturated fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
lt
Phet
P
No of studiescomparisons
No of eventsparticipants
Fig 983090 | Summary most adjusted relative risks for saturated fat intake and all cause mortality CHD mortality CVD mortalitytotal CHD ischemic stroke and type 983090 diabetes All effect estimates are from random effects analyses P value is for Z testof no overall association between exposure and outcome Phet is for test of no differences in association measure amongstudies I983090 is proportion of total variation in study estimates from heterogeneity rather than sampling error
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Case-control studies (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Total trans fats Prospective cohort studies (n= data points) Industrial trans fats Prospective cohort studies (n= data points) Ruminant trans fats Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Previously unpublished data added during manual search (n=)
Excluded (n=) Did not assess trans fat exposure (n=) Cross sectional studies (n=) Did not allow isolation of trans fat effect (n=) Did not present a measure of association (n=) Did not measure outcome(s) of interest (n=) Could not obtain original article (n=)
Other (editorials commentaries reviews case series duplicate publications abstracts only (n=)
Fig 983091 | PRISMA summary of evidence search and selection for trans unsaturated fat andhealth outcomes (up to 983089 May 983090983088983089983093)
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
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RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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at intake and early mortality patternsmdashdata rom The Malmo Diet andCancer Study J Intern Med 983090983088983088983093983090983093983096983089983093983091-983094983093
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Tocopherol Beta-Carotene Cancer Prevention Study Am J Epidemiol 983089983097983097983095983089983092983093983096983095983094-983096983095
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J Med 983089983097983096983089983091983088983092983094983093-983095983088983093983089 Xu J Eilat-Adar S Loria C et al Dietary at intake and risk o coronary
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983093983091 Sauvaget C Nagano J Hayashi M Yamada M Animal protein animalat and cholesterol intakes and risk o cerebral inarction mortality inthe adult health study Stroke 983090983088983088983092983091983093983089983093983091983089-983095
983093983092 Fehily AM Yarnell JW Sweetnam PM Elwood PC Diet and incidentischaemic heart disease the Caerphilly Study Br J Nutr 983089983097983097983091983094983097983091983088983091-983089983092
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983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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RESEARCH
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983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
fatty acids in the food supply are animal products such
as butter cowsrsquo milk meat salmon and egg yolks and
some plant products such as chocolate and cocoa butter
coconut and palm kernel oils Previous meta-analyses
of prospective cohort studies reported pooled relative
risk estimates comparing extremes of intake of saturated
fat of 983089983088983095 (983097983093 confidence interval 983088983097983094 to 983089983089983097 P=983088983090983090)
for coronary heart disease (CHD) 983088983096983089 (983088983094983090 to 983089983088983093
P=983088983089983089) for stroke and 983089983088983088 (983088983096983097 to 983089983089983089 P=983088983097983093) for car-
diovascular disease (CVD)983094 Intervention trials have
shown modest cardiovascular benefits of reducing
intake of saturated fat while increasing intake of polyun-
saturated fat983095 but most trials lasted only up to two years
and examined surrogate outcomes A meta-analysis of
randomized trials suggested a 983089983095 reduction in risk of
CVD in studies that reduced saturated fat intake from
about 983089983095 to about 983097 of energy (983088983096983091 983088983095983090 to 983088983097983094)983096
Trans fats contribute about 983089-983090 of energy in the
North American diet983097-983089983089 and are produced industrially
through partial hydrogenation of liquid plant oils in the
presence of a metal catalyst vacuum and high heat or
can occur naturally in meat and dairy products where
ruminant animals biohydrogenate unsaturated fatty
acids via bacterial enzymes The major industrially
produced trans fatty acids in the food supply are elaidic
acid isomers and the major ruminant derived trans
fatty acid is vaccenic acid both share the characteristic
of having at least one double bond in the ldquotrans-rdquo rather
than ldquocis-rdquo configuration A prior meta-analysis
reported pooled relative risk estimates of CHD of 983089983090983090
(983097983093 confidence interval 983089983088983096 to 983089983091983096 P=983088983088983088983090) for
extremes of total intake of trans fats 983089983091983088 (983088983096983088 to 983090983089983092
P=983088983090983097) for intake of industrially produced trans fats
and 983088983097983091 (983088983095983092 to 983089983089983096 P=983088983093983094) for intake of ruminantderived trans fats983089983090 suggesting that industrially pro-
duced trans fats might increase the risk of CHD though
this could also reflect the low levels of ruminant derived
trans fats compared with the higher doses of industri-
ally produced trans fats typically consumed in studies
and available in the food supply983089983091
Dietary guidelines recommend that saturated fats
should be limited to lt983089983088 (983093-983094 for those who would
benefit from lowering of LDL cholesterol) and trans fats
to lt983089 of energy or as low as possible983089983092-983089983097 primarily to
reduce risk of ischemic heart disease and stroke To
clarify controversies surrounding guidelines for satu-
rated and trans fats for adults we have extended andupdated previous work to synthesize prospective asso-
ciations between these fats and all cause mortality and
type 983090 diabetes (which have not been previously synthe-
sized) separate estimates for risks of cardiovascular
morbidity and mortality and assess the confidence in
the observational evidence using the Grading of Recom-
mendations Assessment Development and Evaluation
(GRADE) approach983090983088-983090983090
Methods
This review was conducted in accordance with the
WHOrsquos guideline development process983090983091 based on the
Cochrane Collaboration approach983090983092 and reportedaccording to the MOOSE checklist983090983093
Data sources
We conducted independent searches for relevant
observational studies assessing the association
between saturated andor trans fats and health out-
comes up to 983089 May 983090983088983089983093 (appendix 983089 gives full details)
This included searching Medline (from 983089983097983092983094) Embase
(from 983089983097983095983092) Cochrane Central Registry of Controlled
Trials (from 983089983097983097983094) Evidence Based Medicine Reviews
(from 983089983097983097983094) and CINAHL (from 983089983097983096983091) Reference lists of
retrieved articles and previous systematic and narra-
tive reviews983089 983089983090 983090983094-983090983097 were hand searched There were no
language restrictions
Study selection
Eligible studies included any observational study con-
ducted in humans (such as prospective cohort
case-control nested case-control or case-cohort
design) that reported a measure of association (such as
hazard ratios or incident rate ratios for prospective
studies or odds ratios for retrospective studies)
between intakes of saturated or trans fat measured by
self report or a biomarker and all cause mortality coro-
nary heart disease stroke or type 983090 diabetes measured
by self report andor confirmed by medical records or
registry linkage One reviewer assessed titles and
abstracts of all studies identified through electronic
searches Potentially eligible studies were reviewed
independently by a second reviewer with discrepan-
cies resolved by discussion and when necessary a
senior author was consulted to reach consensus
Data extraction
Pairs of authors independently extracted details of the
study design country of conduct exposure and out-come assessment participant characteristics and sta-
tistical analyses including adjustment for confounders
from included studies using pretested instruments (see
appendix 983089) with discrepancies resolved by discussion
Authors were contacted for additional data when nec-
essary We used Plot Digitizer (httpplotdigitizer
sourceforgenet) to extract numerical estimates from
graphs
Assessment of trans fats exposure methods
To assess the accuracy of measures of trans fats in stud-
ies that did not directly measure concentrations in
blood or adipose tissues we assessed the potential formisclassification The lowest risk of misclassification
was for those studies that used a food frequency ques-
tionnaire validated against multiple day prospective
diet records or 983090983092 hour recalls directly measured adi-
pose tissue trans fatty acids in a subset of the popula-
tion and analyzed dietary intake with an updated
database of foods A study was rated as at low risk of
misclassification if it accomplished all three moderate
risk of misclassification) if it accomplished two of three
high risk of misclassification if it accomplished one of
three or at very high risk of misclassification if it did
not accomplish any For assessment of ruminant trans
fats the most common approach was to use the knownnutrient composition from food tables for dairy and
7232019 journal 2 newpdf
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RESEARCH
3
meat products to estimate ruminant trans fats and pos-
sibly supplemented by direct measurement with gas
chromatography (see eTable 983089 in appendix 983090)
Study risk of bias
We used the Newcastle-Ottawa scale983091983088 to assess the risk
of bias of the included studies on the basis of selection
of study groups comparability of groups and ascer-
tainment of exposure(s) or outcome(s)
Grading of recommendations assessment
development and evaluation (GRADE)
The GRADE approach was used to assess the confi-
dence in the effect estimates derived from the body of
evidence (quality of evidence) by outcome and pro-
duce evidence profiles983090983088-983090983090 We limited the presenta-
tions of results in the main text to the synthesis of
prospective cohort studies as these are considered the
highest level of evidence for observational studies and
thus were used for the GRADE assessments of confi-
dence Appendix 983091 provides full details of designs that
did not directly inform GRADE (that is retrospective
case-control studies and other studies not amenable
to quantitative synthesis) All investigators discussed
and reviewed evidence summaries and GRADE assess-
ments which were reviewed with the WHO Nutrition
Guidance Expert Advisory Group (NUGAG) subgroup
on diet and health as part of WHOrsquos guideline develop-
ment process Confidence in the estimate of each asso-
ciation was categorized into four levels from very low
to high
Data synthesis and analysis
Statistical synthesis o effect estimatesThe principal association measures were the risk ratios
between extreme levels of intake (highest v lowest) for
prospective studies and the odds ratio between extreme
levels of exposure (highest v lowest) for retrospective
studies For each study we calculated most adjusted
(that is the multivariable association measure with the
highest number of covariates) and least adjusted (that
is the multivariable association measure with the few-
est number of covariates) estimates and corresponding
983097983093 confidence intervals for each outcome We
extracted both estimates to assess whether relevant
confounders (such as smoking age) and intermediate
variables (such as LDL cholesterol blood pressure)were captured in the statistical models Analyses that
adjust for potential confounders and intermediate vari-
ables will generally represent conservative estimates of
the strength of the associations and analyses that do
not adjust for these will generally reflect the effect not
only of exposure to fat but of other determinants of the
health outcomes We present both models to assess the
impact of these variables on the reported association
When at least two studies provided data we performed
a DerSimonian and Laird random effects meta-analysis
which yields conservative confidence intervals around
relative risks in the presence of heterogeneity983091983089 When
three or fewer studies were combined we also consid-ered fixed effect estimates
Heterogeneity
Heterogeneity was determined with Cochranrsquos Q test
(significant at Plt983088983089983088) quantified with the I983090 statistic
(range from 983088-983089983088983088)983091983090 and used to assess inconsis-
tency as part of the GRADE assessment of evidence
quality If ge983089983088 studies were available983091983091 983091983092 and heteroge-
neity was substantial (I983090gt983094983088 or PQlt983088983089983088)983091983090 we used
meta-regression to explore heterogeneity by baseline
year of study continent of conduct length of follow-up
median age of participants proportion of smokers in
the sample amount of saturated fat in reference cate-
gory mean saturated or trans fat intake of the popula-
tion sex α-linoleic acid total polyunsaturated fat
adjustment for total energy method and frequency of
exposure assessment risk of bias score and adjust-
ment for lipids or blood pressure (that is causal inter-
mediates)
Sensitivity
We carried out four a priori sensitivity analyses We
removed each single study from the meta-analyses and
recalculated the summary association (the ldquoleave one
outrdquo approach)983091983093 removed studies with scores lt983095 on
the Newcastle-Ottawa scale and recalculated the
pooled association included unpublished data on
trans fats and CHD mortality (P Knekt personal com-
munication) and removed risk estimates imputed
because of incomplete reporting A study whose
removal either pushed the significance level of the
overall association from lt983088983088983093 to ge983088983088983093 (or vice versa)
or altered the nominal effect size by 983089983088 or more was
considered an influential outlier At the request of the
For saturated fats and total CHD983092983092 983092983097-983094983090 the summary
most adjusted multivariable risk ratio was 983089983088983094 (983097983093
confidence interval 983088983097983093 to 983089983089983095 P=983088983090983097 I983090=983092983095Phet=983088983088983090) (fig 983090 appendix 983092 eFigure 983093) As risk esti-
mates from three comparisons983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these three comparisons
resulted in a summary risk ratio of 983089983088983096 (983088983097983095 to 983089983090983088
P=983088983089983096 I983090=983093983089 Phet=983088983088983089) The summary least adjusted
relative risk was 983089983089983090 (983089983088983088 to 983089983090983094 P=983088983088983093 I983090=983094983091
Phetlt983088983088983088983089) (appendix 983092 eFigure 983094) No study was an
influential outlier
For saturated fats and ischemic stroke983092983095 983093983091 983093983095 983093983096 983094983089 983094983091-983095983088
the summary most adjusted multivariable risk ratio was
983089983088983090 (983097983093 confidence interval 983088983097983088 to 983089983089983093 P=983088983095983097
I983090=983093983097 Phet=983088983088983088983090) (fig 983090 appendix 983092 eFigure 983095) As riskestimates for four comparisons983092983095 983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these four comparisons
resulted in a summary risk ratio of 983089983088983091 (983088983096983097 to 983089983089983097
P=983088983094983096 I983090=983094983094 Phetlt983088983088983088983089) The summary least
adjusted risk ratio was 983089983088983091 (983088983097983089 to 983089983089983094 P=983088983094983093 I983090=983094983094
Phetlt983088983088983088983089) (appendix 983092 eFigure 983096) No study was an
influential outlier
Type 983090 diabetes
For saturated fats and type 983090 diabetes983095983089-983095983095 983095983096 the sum-
mary most adjusted multivariable risk ratio was 983088983097983093
(983097983093 confidence interval 983088983096983096 to 983089983088983091 P=983088983090983088 I983090=983088Phet=983088983094983089) (fig 983090 appendix 983092 eFigure 983097) The summary
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Prospective cohort studies (n=) Case-control studies (n=) Pooling study (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Excluded (n=)
Did not assess saturated fat exposure (n=) Did not measure outcome(s) of interest (n=) Duplicate data from previous publication (n=) Did not present a measure of association (n=) Inappropriate study design (abstracts cross sectional studies reviews) (n=)
Fig 983089 | PRISMA summary of evidence search and selection for saturated fat and healthoutcomes (up to 983089 May 983090983088983089983093)
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 516thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
5
least adjusted risk ratio was 983089983090983091 (983088983097983096 to 983089983093983090 P=983088983088983095
I983090=983097983089 Phetlt983088983088983088983089) (appendix 983092 eFigure 983089983088) No study
was an influential outlier
Trans fats and health outcomes
Literature low
We identified 983089983096 983096983091983093 potentially eligible articles (fig 983091 )
After full text review 983090983088 primary reports of associa-
tions between total trans fats and the health outcomes
in prospective cohort studies (published between 983089983097983097983094
and 983090983088983089983093) provided 983090983096 data points that contributed to
the quantitative synthesis Cohorts were enrolled from
the US (983089983092 studies 983089983097 data points) Finland (four stud-
ies six data points) China (one study one data point)
and the Netherlands (one study two data points)
One systematic review contributed one data point
from a previously unpublished prospective cohort
study983089983090 and one author provided updated unpub-
lished data from the Finnish Mobile Health clinics
(P Knekt personal communication) Four primary
reports of associations between industrial trans fats
and the health outcomes (published between 983089983097983097983091 and
983090983088983089983091) provided four data points that contributed to the
quantitative synthesis Cohorts were enrolled from the
US (one study one data point) Finland (one study
one data point) the Netherlands (one study one data
point) and Norway (one study one data point) Nine
primary reports of associations between ruminant
trans fats and the health outcomes (published
between 983089983097983097983091 and 983090983088983089983093) provided 983089983091 data points that
contributed to the quantitative synthesis Cohorts
came from the US (five studies five data points) Nor-
way (one study four data points) Finland (one studyone data point) Denmark (one study two data points)
and the Netherlands (one study one data point)
Appendix 983090 shows full study characteristics in eTable
983089983089 for prospective cohort studies eTable 983089983090 for retro-
spective case-control studies eTable 983089983091 for nested
case-control or case-cohort studies and eTables 983093 and
983094 for scores on the Newcastle-Ottawa scale Summaries
of results for case-control studies nested case-control
studies dose-responsesubstitution relations and
studies that did not inform the GRADE evidence table
are presented in appendix 983091 We use the term ldquototal
trans fatsrdquo to refer to the estimate of exposure to all
trans fats whether industrially produced or ruminantderived and present specific associations of industri-
ally produced and ruminant derived trans fats with
health outcomes separately when available The spec-
ificity of trans fat measurement provided by each study
is presented in appendix 983090 eTables 983089 983089983089 983089983090 and 983089983091
All cause mortality
The pooled random effects most adjusted multivariable
risk ratio of high versus low total intake of trans unsatu-
rated fatty acid estimated from two published reports983092983090 983095983097
(two comparisons) including 983090983089983092983089 deaths in 983090983088 983091983092983094
individuals was 983089983092983090 (983097983093 confidence interval 983089983088983092 to 983089983097983092
P=983088983088983091) with some evidence of heterogeneity betweenstudies (I983090=983095983088 Phet=983088983088983095) appendix 983092 eFigure 983089983089)
All cause mortality
CHD mortality
CVD mortality
CHD total
Ischemic strokeType diabetes
( to )
( to )
( to )
( to )
( to ) ( to )
Outcome
Saturated fatsprotective
Saturated fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
lt
Phet
P
No of studiescomparisons
No of eventsparticipants
Fig 983090 | Summary most adjusted relative risks for saturated fat intake and all cause mortality CHD mortality CVD mortalitytotal CHD ischemic stroke and type 983090 diabetes All effect estimates are from random effects analyses P value is for Z testof no overall association between exposure and outcome Phet is for test of no differences in association measure amongstudies I983090 is proportion of total variation in study estimates from heterogeneity rather than sampling error
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Case-control studies (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Total trans fats Prospective cohort studies (n= data points) Industrial trans fats Prospective cohort studies (n= data points) Ruminant trans fats Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Previously unpublished data added during manual search (n=)
Excluded (n=) Did not assess trans fat exposure (n=) Cross sectional studies (n=) Did not allow isolation of trans fat effect (n=) Did not present a measure of association (n=) Did not measure outcome(s) of interest (n=) Could not obtain original article (n=)
Other (editorials commentaries reviews case series duplicate publications abstracts only (n=)
Fig 983091 | PRISMA summary of evidence search and selection for trans unsaturated fat andhealth outcomes (up to 983089 May 983090983088983089983093)
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
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RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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983090 Harcombe Z Baker JS Cooper SM et al Evidence rom randomisedcontrolled trials did not support the introduction o dietary atguidelines in 983089983097983095983095 and 983089983097983096983091 a systematic review and meta-analysisOpen Heart 983090983088983089983093983090e983088983088983088983089983097983094
983091 Siri-Tarino PW Sun Q Hu FB Krauss RM Meta-analysis o prospectivecohort studies evaluating the association o saturated at withcardiovascular disease Am J Clin Nutr 983090983088983089983088983097983089983093983091983093-983092983094
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Flickinger BD Trans atty acid intakes and ood sources in the US
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
983094983088 Posner BM Cobb JL Belanger AJ Cupples LA DrsquoAgostino RB Stokes J983091rd Dietary lipid predictors o coronary heart disease in men TheFramingham Study Arch Intern Med 983089983097983097983089983089983093983089983089983089983096983089-983095
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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RESEARCH
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acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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RESEARCH
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and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
For saturated fats and total CHD983092983092 983092983097-983094983090 the summary
most adjusted multivariable risk ratio was 983089983088983094 (983097983093
confidence interval 983088983097983093 to 983089983089983095 P=983088983090983097 I983090=983092983095Phet=983088983088983090) (fig 983090 appendix 983092 eFigure 983093) As risk esti-
mates from three comparisons983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these three comparisons
resulted in a summary risk ratio of 983089983088983096 (983088983097983095 to 983089983090983088
P=983088983089983096 I983090=983093983089 Phet=983088983088983089) The summary least adjusted
relative risk was 983089983089983090 (983089983088983088 to 983089983090983094 P=983088983088983093 I983090=983094983091
Phetlt983088983088983088983089) (appendix 983092 eFigure 983094) No study was an
influential outlier
For saturated fats and ischemic stroke983092983095 983093983091 983093983095 983093983096 983094983089 983094983091-983095983088
the summary most adjusted multivariable risk ratio was
983089983088983090 (983097983093 confidence interval 983088983097983088 to 983089983089983093 P=983088983095983097
I983090=983093983097 Phet=983088983088983088983090) (fig 983090 appendix 983092 eFigure 983095) As riskestimates for four comparisons983092983095 983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these four comparisons
resulted in a summary risk ratio of 983089983088983091 (983088983096983097 to 983089983089983097
P=983088983094983096 I983090=983094983094 Phetlt983088983088983088983089) The summary least
adjusted risk ratio was 983089983088983091 (983088983097983089 to 983089983089983094 P=983088983094983093 I983090=983094983094
Phetlt983088983088983088983089) (appendix 983092 eFigure 983096) No study was an
influential outlier
Type 983090 diabetes
For saturated fats and type 983090 diabetes983095983089-983095983095 983095983096 the sum-
mary most adjusted multivariable risk ratio was 983088983097983093
(983097983093 confidence interval 983088983096983096 to 983089983088983091 P=983088983090983088 I983090=983088Phet=983088983094983089) (fig 983090 appendix 983092 eFigure 983097) The summary
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Prospective cohort studies (n=) Case-control studies (n=) Pooling study (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Excluded (n=)
Did not assess saturated fat exposure (n=) Did not measure outcome(s) of interest (n=) Duplicate data from previous publication (n=) Did not present a measure of association (n=) Inappropriate study design (abstracts cross sectional studies reviews) (n=)
Fig 983089 | PRISMA summary of evidence search and selection for saturated fat and healthoutcomes (up to 983089 May 983090983088983089983093)
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RESEARCH
5
least adjusted risk ratio was 983089983090983091 (983088983097983096 to 983089983093983090 P=983088983088983095
I983090=983097983089 Phetlt983088983088983088983089) (appendix 983092 eFigure 983089983088) No study
was an influential outlier
Trans fats and health outcomes
Literature low
We identified 983089983096 983096983091983093 potentially eligible articles (fig 983091 )
After full text review 983090983088 primary reports of associa-
tions between total trans fats and the health outcomes
in prospective cohort studies (published between 983089983097983097983094
and 983090983088983089983093) provided 983090983096 data points that contributed to
the quantitative synthesis Cohorts were enrolled from
the US (983089983092 studies 983089983097 data points) Finland (four stud-
ies six data points) China (one study one data point)
and the Netherlands (one study two data points)
One systematic review contributed one data point
from a previously unpublished prospective cohort
study983089983090 and one author provided updated unpub-
lished data from the Finnish Mobile Health clinics
(P Knekt personal communication) Four primary
reports of associations between industrial trans fats
and the health outcomes (published between 983089983097983097983091 and
983090983088983089983091) provided four data points that contributed to the
quantitative synthesis Cohorts were enrolled from the
US (one study one data point) Finland (one study
one data point) the Netherlands (one study one data
point) and Norway (one study one data point) Nine
primary reports of associations between ruminant
trans fats and the health outcomes (published
between 983089983097983097983091 and 983090983088983089983093) provided 983089983091 data points that
contributed to the quantitative synthesis Cohorts
came from the US (five studies five data points) Nor-
way (one study four data points) Finland (one studyone data point) Denmark (one study two data points)
and the Netherlands (one study one data point)
Appendix 983090 shows full study characteristics in eTable
983089983089 for prospective cohort studies eTable 983089983090 for retro-
spective case-control studies eTable 983089983091 for nested
case-control or case-cohort studies and eTables 983093 and
983094 for scores on the Newcastle-Ottawa scale Summaries
of results for case-control studies nested case-control
studies dose-responsesubstitution relations and
studies that did not inform the GRADE evidence table
are presented in appendix 983091 We use the term ldquototal
trans fatsrdquo to refer to the estimate of exposure to all
trans fats whether industrially produced or ruminantderived and present specific associations of industri-
ally produced and ruminant derived trans fats with
health outcomes separately when available The spec-
ificity of trans fat measurement provided by each study
is presented in appendix 983090 eTables 983089 983089983089 983089983090 and 983089983091
All cause mortality
The pooled random effects most adjusted multivariable
risk ratio of high versus low total intake of trans unsatu-
rated fatty acid estimated from two published reports983092983090 983095983097
(two comparisons) including 983090983089983092983089 deaths in 983090983088 983091983092983094
individuals was 983089983092983090 (983097983093 confidence interval 983089983088983092 to 983089983097983092
P=983088983088983091) with some evidence of heterogeneity betweenstudies (I983090=983095983088 Phet=983088983088983095) appendix 983092 eFigure 983089983089)
All cause mortality
CHD mortality
CVD mortality
CHD total
Ischemic strokeType diabetes
( to )
( to )
( to )
( to )
( to ) ( to )
Outcome
Saturated fatsprotective
Saturated fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
lt
Phet
P
No of studiescomparisons
No of eventsparticipants
Fig 983090 | Summary most adjusted relative risks for saturated fat intake and all cause mortality CHD mortality CVD mortalitytotal CHD ischemic stroke and type 983090 diabetes All effect estimates are from random effects analyses P value is for Z testof no overall association between exposure and outcome Phet is for test of no differences in association measure amongstudies I983090 is proportion of total variation in study estimates from heterogeneity rather than sampling error
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Case-control studies (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Total trans fats Prospective cohort studies (n= data points) Industrial trans fats Prospective cohort studies (n= data points) Ruminant trans fats Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Previously unpublished data added during manual search (n=)
Excluded (n=) Did not assess trans fat exposure (n=) Cross sectional studies (n=) Did not allow isolation of trans fat effect (n=) Did not present a measure of association (n=) Did not measure outcome(s) of interest (n=) Could not obtain original article (n=)
Other (editorials commentaries reviews case series duplicate publications abstracts only (n=)
Fig 983091 | PRISMA summary of evidence search and selection for trans unsaturated fat andhealth outcomes (up to 983089 May 983090983088983089983093)
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
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RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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983097983097 Smith-Warner SA Spiegelman D Adami HO et al Types o dietary atand breast cancer a pooled analysis o cohort studies Int J Cancer 983090983088983088983089983097983090983095983094983095-983095983092
983089983088983088 Larsson SC Orsini N Red meat and processed meat consumption andall-cause mortality a meta-analysis Am J Epidemiol 983090983088983089983091
983089983088983089 OrsquoSullivan TA Haekost K Mitrou F Lawrence D Food sources osaturated at and the association with mortality a meta-analysis Am JPublic Health 983090983088983089983091983089983088983091e983091983089-983092983090
983089983088983090 Rohrmann S Overvad K Bueno-de-Mesquita HB et al Meatconsumption and mortalitymdashresults rom the European Prospective
Investigation into Cancer and Nutrition BMC Med 983090983088983089983091983089983089983094983091983089983088983091 Zhu H Yang X Zhang C et al Red and processed meat intake is
associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
983089983088983092 Choi Y Song S Song Y Lee JE Consumption o red and processedmeat and esophageal cancer risk meta-analysis World JGastroenterol 983090983088983089983091983089983097983089983088983090983088-983097
983089983088983093 Aune D Chan DS Vieira AR et al Red and processed meat intake andrisk o colorectal adenomas a systematic review and meta-analysis oepidemiological studies Cancer Causes Control 983090983088983089983091983090983092983094983089983089-983090983095
983089983088983094 World Cancer Research FundAmerican Institute or Cancer ResearchFood nutrition physical activity and the prevention o cancer aglobal Perspective World Cancer Research FundAmerican Instituteor Cancer Research 983090983088983088983095
983089983088983095 Tanasescu M Cho E Manson JE Hu FB Dietary at and cholesteroland the risk o cardiovascular disease among women with type 983090diabetes Am J Clin Nutr 983090983088983088983092983095983097983097983097983097-983089983088983088983093
983089983088983096 Trichopoulou A Psaltopoulou T Oranos P Trichopoulos D Diet andphysical activity in relation to overall mortality amongst adultdiabetics in a general population cohort J Intern Med 983090983088983088983094983090983093983097983093983096983091-983097983089
983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
983089983089983088 Franz MJ Bantle JP Beebe CA et al Evidence-based nutritionprinciples and recommendations or the treatment and prevention odiabetes and related complications Diabetes Care 983090983088983088983091983090983094 Suppl983089S983093983089-983094983089
983089983089983089 Jakobsen MU OrsquoReilly EJ Heitmann BL et al Major types o dietary atand risk o coronary heart disease a pooled analysis o 983089983089 cohortstudies Am J Clin Nutr 983090983088983088983097983096983097983089983092983090983093-983091983090
983089983089983090 Dayton S Pearce ML Hashimoto S Dixon WJ Tomiyasu U A controlledclinical trial o a diet high in unsaturated at in preventingcomplications o atherosclerosis Circulation 983089983097983094983097983092983088II-983089-II-983094983091
983089983089983091 Leren P The Oslo diet-heart study Eleven-year report Circulation 983089983097983095983088983092983090983097983091983093-983092983090
983089983089983092 Turpeinen O Karvonen MJ Pekkarinen M Miettinen M Elosuo RPaavilainen E Dietary prevention o coronary heart disease theFinnish Mental Hospital Study Int J Epidemiol 983089983097983095983097983096983097983097-983089983089983096
983089983089983093 Liu S Willett WC Stamper MJ et al A prospective study o dietaryglycemic load carbohydrate intake and risk o coronary heart diseasein US women Am J Clin Nutr 983090983088983088983088983095983089983089983092983093983093-983094983089
983089983089983094 Jakobsen MU Dethlesen C Joensen AM et al Intake o carbohydratescompared with intake o saturated atty acids and risk o myocardialinarction importance o the glycemic index Am J Clin Nutr 983090983088983089983088983097983089983089983095983094983092-983096
983089983089983095 Hu FB Stamper MJ Manson JE et al Dietary saturated ats and theirood sources in relation to the risk o coronary heart disease inwomen Am J Clin Nutr 983089983097983097983097983095983088983089983088983088983089-983096
983089983089983096 De Oliveira Otto MC Mozaffarian D et al Dietary intake o saturated
at by ood source and incident cardiovascular disease theMulti-Ethnic Study o Atherosclerosis Am J Clin Nutr 983090983088983089983090983097983094983091983097983095-983092983088983092
983089983089983097 Rasmussen BM Vessby B Uusitupa M et al Effects o dietarysaturated monounsaturated and n-983091 atty acids on blood pressure inhealthy subjects Am J Clin Nutr 983090983088983088983094983096983091983090983090983089-983094
983089983090983088 Riserus U Fatty acids and insulin sensitivity Curr Opin Clin NutrMetab Care 983090983088983088983096983089983089983089983088983088-983093
983089983090983089 Perez-Jimenez F Lopez-Miranda J Pinillos MD et al A Mediterraneanand a high-carbohydrate diet improve glucose metabolism in healthyyoung persons Diabetologia 983090983088983088983089983092983092983090983088983091983096-983092983091
983089983090983090 Vessby B Uusitupa M Hermansen K et al Substituting dietarysaturated or monounsaturated at impairs insulin sensitivity inhealthy men and women The KANWU Study Diabetologia 983090983088983088983089983092983092983091983089983090-983097
983089983090983091 Tinker LF Bonds DE Margolis KL et al Low-at dietary pattern and risko treated diabetes mellitus in postmenopausal women the WomenrsquosHealth Initiative randomized controlled dietary modification trial Arch
Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
983089983090983093 Micha R Michas G Mozaffarian D Unprocessed red and processedmeats and risk o coronary artery disease and type 983090 diabetesmdashanupdated review o the evidence Curr Atheroscler Rep 983090983088983089983090983089983092983093983089983093-983090983092
983089983090983094 Lee JE McLerran DF Rolland B et al Meat intake and cause-specificmortality a pooled analysis o Asian prospective cohort studies Am JClin Nutr 983090983088983089983091983097983096983089983088983091983090-983092983089
983089983090983095 Forouhi NG Koulman A Sharp SJ et al Differences in the prospectiveassociation between individual plasma phospholipid saturated attyacids and incident type 983090 diabetes the EPIC-InterAct case-cohortstudy Lancet Diabetes Endocrinol 983090983088983089983092983090983096983089983088-983096
983089983090983096 Turcot V Brunet J Daneault C Tardi JC Des Rosiers C Lettre GValidation o atty acid intakes estimated by a ood requencyquestionnaire using erythrocyte atty acid profiling in the MontrealHeart Institute Biobank J Hum Nutr Diet 983090983088983089983092 wwwncbinlmnihgov
pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
983089983091983088 Sluijs I Forouhi NG Beulens JW et al The amount and type o dairyproduct intake and incident type 983090 diabetes results rom theEPIC-InterAct Study Am J Clin Nutr 983090983088983089983090983097983094983091983096983090-983097983088
983089983091983089 OrsquoConnor LM Lentjes MA Luben RN Khaw KT Wareham NJ ForouhiNG Dietary dairy product intake and incident type 983090 diabetes aprospective study using dietary data rom a 983095-day ood diaryDiabetologia 983090983088983089983092983093983095983097983088983097-983089983095
983089983091983090 Hudgins LC Hellerstein M Seidman C Neese R Diakun J Hirsch JHuman atty acid synthesis is stimulated by a eucaloric low at highcarbohydrate diet J Clin Invest 983089983097983097983094983097983095983090983088983096983089-983097983089
983089983091983091 Siler SQ Neese RA Hellerstein MK De novo lipogenesis lipid kineticsand whole-body lipid balances in humans aer acute alcoholconsumption Am J Clin Nutr 983089983097983097983097983095983088983097983090983096-983091983094
983089983091983092 Hodson L Skeaff CM Fielding BA Fatty acid composition o adiposetissue and blood in humans and its use as a biomarker o dietaryintake Prog Lipid Res 983090983088983088983096983092983095983091983092983096-983096983088
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RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
983089983091983094 Willett WC Ascherio A Trans atty acids are the effects only marginal Am J Public Health 983089983097983097983092983096983092983095983090983090-983092
983089983091983095 Danaei G Ding EL Mozaffarian D et al The preventable causes odeath in the United States comparative risk assessment o dietaryliestyle and metabolic risk actors PLoS Med 983090983088983088983097983094e983089983088983088983088983088983093983096
983089983091983096 Chiuve SE Rimm EB Manson JE et al Intake o total trans trans-983089983096983089
and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
For saturated fats and total CHD983092983092 983092983097-983094983090 the summary
most adjusted multivariable risk ratio was 983089983088983094 (983097983093
confidence interval 983088983097983093 to 983089983089983095 P=983088983090983097 I983090=983092983095Phet=983088983088983090) (fig 983090 appendix 983092 eFigure 983093) As risk esti-
mates from three comparisons983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these three comparisons
resulted in a summary risk ratio of 983089983088983096 (983088983097983095 to 983089983090983088
P=983088983089983096 I983090=983093983089 Phet=983088983088983089) The summary least adjusted
relative risk was 983089983089983090 (983089983088983088 to 983089983090983094 P=983088983088983093 I983090=983094983091
Phetlt983088983088983088983089) (appendix 983092 eFigure 983094) No study was an
influential outlier
For saturated fats and ischemic stroke983092983095 983093983091 983093983095 983093983096 983094983089 983094983091-983095983088
the summary most adjusted multivariable risk ratio was
983089983088983090 (983097983093 confidence interval 983088983097983088 to 983089983089983093 P=983088983095983097
I983090=983093983097 Phet=983088983088983088983090) (fig 983090 appendix 983092 eFigure 983095) As riskestimates for four comparisons983092983095 983093983092 983093983096 could not be
extracted we used estimates reported in a previous
meta-analysis983091 Removal of these four comparisons
resulted in a summary risk ratio of 983089983088983091 (983088983096983097 to 983089983089983097
P=983088983094983096 I983090=983094983094 Phetlt983088983088983088983089) The summary least
adjusted risk ratio was 983089983088983091 (983088983097983089 to 983089983089983094 P=983088983094983093 I983090=983094983094
Phetlt983088983088983088983089) (appendix 983092 eFigure 983096) No study was an
influential outlier
Type 983090 diabetes
For saturated fats and type 983090 diabetes983095983089-983095983095 983095983096 the sum-
mary most adjusted multivariable risk ratio was 983088983097983093
(983097983093 confidence interval 983088983096983096 to 983089983088983091 P=983088983090983088 I983090=983088Phet=983088983094983089) (fig 983090 appendix 983092 eFigure 983097) The summary
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Prospective cohort studies (n=) Case-control studies (n=) Pooling study (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Excluded (n=)
Did not assess saturated fat exposure (n=) Did not measure outcome(s) of interest (n=) Duplicate data from previous publication (n=) Did not present a measure of association (n=) Inappropriate study design (abstracts cross sectional studies reviews) (n=)
Fig 983089 | PRISMA summary of evidence search and selection for saturated fat and healthoutcomes (up to 983089 May 983090983088983089983093)
7232019 journal 2 newpdf
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RESEARCH
5
least adjusted risk ratio was 983089983090983091 (983088983097983096 to 983089983093983090 P=983088983088983095
I983090=983097983089 Phetlt983088983088983088983089) (appendix 983092 eFigure 983089983088) No study
was an influential outlier
Trans fats and health outcomes
Literature low
We identified 983089983096 983096983091983093 potentially eligible articles (fig 983091 )
After full text review 983090983088 primary reports of associa-
tions between total trans fats and the health outcomes
in prospective cohort studies (published between 983089983097983097983094
and 983090983088983089983093) provided 983090983096 data points that contributed to
the quantitative synthesis Cohorts were enrolled from
the US (983089983092 studies 983089983097 data points) Finland (four stud-
ies six data points) China (one study one data point)
and the Netherlands (one study two data points)
One systematic review contributed one data point
from a previously unpublished prospective cohort
study983089983090 and one author provided updated unpub-
lished data from the Finnish Mobile Health clinics
(P Knekt personal communication) Four primary
reports of associations between industrial trans fats
and the health outcomes (published between 983089983097983097983091 and
983090983088983089983091) provided four data points that contributed to the
quantitative synthesis Cohorts were enrolled from the
US (one study one data point) Finland (one study
one data point) the Netherlands (one study one data
point) and Norway (one study one data point) Nine
primary reports of associations between ruminant
trans fats and the health outcomes (published
between 983089983097983097983091 and 983090983088983089983093) provided 983089983091 data points that
contributed to the quantitative synthesis Cohorts
came from the US (five studies five data points) Nor-
way (one study four data points) Finland (one studyone data point) Denmark (one study two data points)
and the Netherlands (one study one data point)
Appendix 983090 shows full study characteristics in eTable
983089983089 for prospective cohort studies eTable 983089983090 for retro-
spective case-control studies eTable 983089983091 for nested
case-control or case-cohort studies and eTables 983093 and
983094 for scores on the Newcastle-Ottawa scale Summaries
of results for case-control studies nested case-control
studies dose-responsesubstitution relations and
studies that did not inform the GRADE evidence table
are presented in appendix 983091 We use the term ldquototal
trans fatsrdquo to refer to the estimate of exposure to all
trans fats whether industrially produced or ruminantderived and present specific associations of industri-
ally produced and ruminant derived trans fats with
health outcomes separately when available The spec-
ificity of trans fat measurement provided by each study
is presented in appendix 983090 eTables 983089 983089983089 983089983090 and 983089983091
All cause mortality
The pooled random effects most adjusted multivariable
risk ratio of high versus low total intake of trans unsatu-
rated fatty acid estimated from two published reports983092983090 983095983097
(two comparisons) including 983090983089983092983089 deaths in 983090983088 983091983092983094
individuals was 983089983092983090 (983097983093 confidence interval 983089983088983092 to 983089983097983092
P=983088983088983091) with some evidence of heterogeneity betweenstudies (I983090=983095983088 Phet=983088983088983095) appendix 983092 eFigure 983089983089)
All cause mortality
CHD mortality
CVD mortality
CHD total
Ischemic strokeType diabetes
( to )
( to )
( to )
( to )
( to ) ( to )
Outcome
Saturated fatsprotective
Saturated fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
lt
Phet
P
No of studiescomparisons
No of eventsparticipants
Fig 983090 | Summary most adjusted relative risks for saturated fat intake and all cause mortality CHD mortality CVD mortalitytotal CHD ischemic stroke and type 983090 diabetes All effect estimates are from random effects analyses P value is for Z testof no overall association between exposure and outcome Phet is for test of no differences in association measure amongstudies I983090 is proportion of total variation in study estimates from heterogeneity rather than sampling error
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Case-control studies (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Total trans fats Prospective cohort studies (n= data points) Industrial trans fats Prospective cohort studies (n= data points) Ruminant trans fats Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Previously unpublished data added during manual search (n=)
Excluded (n=) Did not assess trans fat exposure (n=) Cross sectional studies (n=) Did not allow isolation of trans fat effect (n=) Did not present a measure of association (n=) Did not measure outcome(s) of interest (n=) Could not obtain original article (n=)
Other (editorials commentaries reviews case series duplicate publications abstracts only (n=)
Fig 983091 | PRISMA summary of evidence search and selection for trans unsaturated fat andhealth outcomes (up to 983089 May 983090983088983089983093)
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
7232019 journal 2 newpdf
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RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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983090 Harcombe Z Baker JS Cooper SM et al Evidence rom randomisedcontrolled trials did not support the introduction o dietary atguidelines in 983089983097983095983095 and 983089983097983096983091 a systematic review and meta-analysisOpen Heart 983090983088983089983093983090e983088983088983088983089983097983094
983091 Siri-Tarino PW Sun Q Hu FB Krauss RM Meta-analysis o prospectivecohort studies evaluating the association o saturated at withcardiovascular disease Am J Clin Nutr 983090983088983089983088983097983089983093983091983093-983092983094
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Anal Control Expo Risk Assess 983090983088983089983090983090983097983096983094983089-983095983092983089983088 Kris-Etherton PM Leevre M Mensink RP Petersen B Fleming J
Flickinger BD Trans atty acid intakes and ood sources in the US
population NHANES 983089983097983097983097-983090983088983088983090 Lipids 983090983088983089983090983092983095983097983091983089-983092983088983089983089 Ratnayake WM LrsquoAbbe MR Farnworth S et al Trans atty acids
current contents in Canadian oods and estimated intake levels orthe Canadian population J AOAC Int 983090983088983088983097983097983090983089983090983093983096-983095983094
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trans atty acids on HDL and LDL cholesterol levels in humansmdashaquantitative review PLoS One 983090983088983089983088983093e983097983092983091983092
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recommendations revision 983090983088983088983094 a scientific statement rom the AmericanHeart Association Nutrition Committee Circulation 983090983088983088983094983089983089983092983096983090-983097983094983089983095 US Department o Agriculture and US Department o Health and
Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
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983090983092 Higgins JPT Green S Cochrane handbook or systematic reviews ointerventions wwwcochrane-handbookorg
983090983093 Stroup DF Berlin JA Morton SC et al Meta-analysis o observationalstudies in epidemiology a proposal or reporting Meta-analysis OObservational Studies in Epidemiology (MOOSE) group JAMA 983090983088983088983088983090983096983091983090983088983088983096-983089983090
983090983094 Gebauer SK Chardigny JM Jakobsen MU et al Effects o ruminanttrans atty acids on cardiovascular disease and cancer acomprehensive review o epidemiological clinical and mechanisticstudies Adv Nutr 983090983088983089983089983090983091983091983090-983093983092
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983090983088983088983088983090983097983090983094983088-983093983091983097 Leosdottir M Nilsson PM Nilsson JA Mansson H Berglund G Dietary
at intake and early mortality patternsmdashdata rom The Malmo Diet andCancer Study J Intern Med 983090983088983088983093983090983093983096983089983093983091-983094983093
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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Tocopherol Beta-Carotene Cancer Prevention Study Am J Epidemiol 983089983097983097983095983089983092983093983096983095983094-983096983095
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J Med 983089983097983096983089983091983088983092983094983093-983095983088983093983089 Xu J Eilat-Adar S Loria C et al Dietary at intake and risk o coronary
heart disease the Strong Heart Study Am J Clin Nutr 983090983088983088983094983096983092983096983097983092-983097983088983090
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983093983091 Sauvaget C Nagano J Hayashi M Yamada M Animal protein animalat and cholesterol intakes and risk o cerebral inarction mortality inthe adult health study Stroke 983090983088983088983092983091983093983089983093983091983089-983095
983093983092 Fehily AM Yarnell JW Sweetnam PM Elwood PC Diet and incidentischaemic heart disease the Caerphilly Study Br J Nutr 983089983097983097983091983094983097983091983088983091-983089983092
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983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
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RESEARCH
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983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
Appendix 983093 GRADE evidence profile for prospective
cohort studies of saturated fatty acids and health
outcomes
Appendix 983094 GRADE evidence profile for prospective
cohort studies of trans fatty acids and health outcomes
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RESEARCH
5
least adjusted risk ratio was 983089983090983091 (983088983097983096 to 983089983093983090 P=983088983088983095
I983090=983097983089 Phetlt983088983088983088983089) (appendix 983092 eFigure 983089983088) No study
was an influential outlier
Trans fats and health outcomes
Literature low
We identified 983089983096 983096983091983093 potentially eligible articles (fig 983091 )
After full text review 983090983088 primary reports of associa-
tions between total trans fats and the health outcomes
in prospective cohort studies (published between 983089983097983097983094
and 983090983088983089983093) provided 983090983096 data points that contributed to
the quantitative synthesis Cohorts were enrolled from
the US (983089983092 studies 983089983097 data points) Finland (four stud-
ies six data points) China (one study one data point)
and the Netherlands (one study two data points)
One systematic review contributed one data point
from a previously unpublished prospective cohort
study983089983090 and one author provided updated unpub-
lished data from the Finnish Mobile Health clinics
(P Knekt personal communication) Four primary
reports of associations between industrial trans fats
and the health outcomes (published between 983089983097983097983091 and
983090983088983089983091) provided four data points that contributed to the
quantitative synthesis Cohorts were enrolled from the
US (one study one data point) Finland (one study
one data point) the Netherlands (one study one data
point) and Norway (one study one data point) Nine
primary reports of associations between ruminant
trans fats and the health outcomes (published
between 983089983097983097983091 and 983090983088983089983093) provided 983089983091 data points that
contributed to the quantitative synthesis Cohorts
came from the US (five studies five data points) Nor-
way (one study four data points) Finland (one studyone data point) Denmark (one study two data points)
and the Netherlands (one study one data point)
Appendix 983090 shows full study characteristics in eTable
983089983089 for prospective cohort studies eTable 983089983090 for retro-
spective case-control studies eTable 983089983091 for nested
case-control or case-cohort studies and eTables 983093 and
983094 for scores on the Newcastle-Ottawa scale Summaries
of results for case-control studies nested case-control
studies dose-responsesubstitution relations and
studies that did not inform the GRADE evidence table
are presented in appendix 983091 We use the term ldquototal
trans fatsrdquo to refer to the estimate of exposure to all
trans fats whether industrially produced or ruminantderived and present specific associations of industri-
ally produced and ruminant derived trans fats with
health outcomes separately when available The spec-
ificity of trans fat measurement provided by each study
is presented in appendix 983090 eTables 983089 983089983089 983089983090 and 983089983091
All cause mortality
The pooled random effects most adjusted multivariable
risk ratio of high versus low total intake of trans unsatu-
rated fatty acid estimated from two published reports983092983090 983095983097
(two comparisons) including 983090983089983092983089 deaths in 983090983088 983091983092983094
individuals was 983089983092983090 (983097983093 confidence interval 983089983088983092 to 983089983097983092
P=983088983088983091) with some evidence of heterogeneity betweenstudies (I983090=983095983088 Phet=983088983088983095) appendix 983092 eFigure 983089983089)
All cause mortality
CHD mortality
CVD mortality
CHD total
Ischemic strokeType diabetes
( to )
( to )
( to )
( to )
( to ) ( to )
Outcome
Saturated fatsprotective
Saturated fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
lt
Phet
P
No of studiescomparisons
No of eventsparticipants
Fig 983090 | Summary most adjusted relative risks for saturated fat intake and all cause mortality CHD mortality CVD mortalitytotal CHD ischemic stroke and type 983090 diabetes All effect estimates are from random effects analyses P value is for Z testof no overall association between exposure and outcome Phet is for test of no differences in association measure amongstudies I983090 is proportion of total variation in study estimates from heterogeneity rather than sampling error
Observational evidence that did not directly inform GRADE evidence synthesis (n=) Nested case-control or case-cohort studies (n=) Case-control studies (n=)
Prospective cohorts used in GRADE quantitative evidence synthesis (n=) Total trans fats Prospective cohort studies (n= data points) Industrial trans fats Prospective cohort studies (n= data points) Ruminant trans fats Prospective cohort studies (n= data points)
Records identified through database search (n= )
Full text articles assessed for eligibility (n=)
Included publications (n=)
κ=
Excluded on title and abstract review (including duplicates) (n= )
Previously unpublished data added during manual search (n=)
Excluded (n=) Did not assess trans fat exposure (n=) Cross sectional studies (n=) Did not allow isolation of trans fat effect (n=) Did not present a measure of association (n=) Did not measure outcome(s) of interest (n=) Could not obtain original article (n=)
Other (editorials commentaries reviews case series duplicate publications abstracts only (n=)
Fig 983091 | PRISMA summary of evidence search and selection for trans unsaturated fat andhealth outcomes (up to 983089 May 983090983088983089983093)
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
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RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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983089983088983090 Rohrmann S Overvad K Bueno-de-Mesquita HB et al Meatconsumption and mortalitymdashresults rom the European Prospective
Investigation into Cancer and Nutrition BMC Med 983090983088983089983091983089983089983094983091983089983088983091 Zhu H Yang X Zhang C et al Red and processed meat intake is
associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
983089983088983092 Choi Y Song S Song Y Lee JE Consumption o red and processedmeat and esophageal cancer risk meta-analysis World JGastroenterol 983090983088983089983091983089983097983089983088983090983088-983097
983089983088983093 Aune D Chan DS Vieira AR et al Red and processed meat intake andrisk o colorectal adenomas a systematic review and meta-analysis oepidemiological studies Cancer Causes Control 983090983088983089983091983090983092983094983089983089-983090983095
983089983088983094 World Cancer Research FundAmerican Institute or Cancer ResearchFood nutrition physical activity and the prevention o cancer aglobal Perspective World Cancer Research FundAmerican Instituteor Cancer Research 983090983088983088983095
983089983088983095 Tanasescu M Cho E Manson JE Hu FB Dietary at and cholesteroland the risk o cardiovascular disease among women with type 983090diabetes Am J Clin Nutr 983090983088983088983092983095983097983097983097983097-983089983088983088983093
983089983088983096 Trichopoulou A Psaltopoulou T Oranos P Trichopoulos D Diet andphysical activity in relation to overall mortality amongst adultdiabetics in a general population cohort J Intern Med 983090983088983088983094983090983093983097983093983096983091-983097983089
983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
983089983089983088 Franz MJ Bantle JP Beebe CA et al Evidence-based nutritionprinciples and recommendations or the treatment and prevention odiabetes and related complications Diabetes Care 983090983088983088983091983090983094 Suppl983089S983093983089-983094983089
983089983089983089 Jakobsen MU OrsquoReilly EJ Heitmann BL et al Major types o dietary atand risk o coronary heart disease a pooled analysis o 983089983089 cohortstudies Am J Clin Nutr 983090983088983088983097983096983097983089983092983090983093-983091983090
983089983089983090 Dayton S Pearce ML Hashimoto S Dixon WJ Tomiyasu U A controlledclinical trial o a diet high in unsaturated at in preventingcomplications o atherosclerosis Circulation 983089983097983094983097983092983088II-983089-II-983094983091
983089983089983091 Leren P The Oslo diet-heart study Eleven-year report Circulation 983089983097983095983088983092983090983097983091983093-983092983090
983089983089983092 Turpeinen O Karvonen MJ Pekkarinen M Miettinen M Elosuo RPaavilainen E Dietary prevention o coronary heart disease theFinnish Mental Hospital Study Int J Epidemiol 983089983097983095983097983096983097983097-983089983089983096
983089983089983093 Liu S Willett WC Stamper MJ et al A prospective study o dietaryglycemic load carbohydrate intake and risk o coronary heart diseasein US women Am J Clin Nutr 983090983088983088983088983095983089983089983092983093983093-983094983089
983089983089983094 Jakobsen MU Dethlesen C Joensen AM et al Intake o carbohydratescompared with intake o saturated atty acids and risk o myocardialinarction importance o the glycemic index Am J Clin Nutr 983090983088983089983088983097983089983089983095983094983092-983096
983089983089983095 Hu FB Stamper MJ Manson JE et al Dietary saturated ats and theirood sources in relation to the risk o coronary heart disease inwomen Am J Clin Nutr 983089983097983097983097983095983088983089983088983088983089-983096
983089983089983096 De Oliveira Otto MC Mozaffarian D et al Dietary intake o saturated
at by ood source and incident cardiovascular disease theMulti-Ethnic Study o Atherosclerosis Am J Clin Nutr 983090983088983089983090983097983094983091983097983095-983092983088983092
983089983089983097 Rasmussen BM Vessby B Uusitupa M et al Effects o dietarysaturated monounsaturated and n-983091 atty acids on blood pressure inhealthy subjects Am J Clin Nutr 983090983088983088983094983096983091983090983090983089-983094
983089983090983088 Riserus U Fatty acids and insulin sensitivity Curr Opin Clin NutrMetab Care 983090983088983088983096983089983089983089983088983088-983093
983089983090983089 Perez-Jimenez F Lopez-Miranda J Pinillos MD et al A Mediterraneanand a high-carbohydrate diet improve glucose metabolism in healthyyoung persons Diabetologia 983090983088983088983089983092983092983090983088983091983096-983092983091
983089983090983090 Vessby B Uusitupa M Hermansen K et al Substituting dietarysaturated or monounsaturated at impairs insulin sensitivity inhealthy men and women The KANWU Study Diabetologia 983090983088983088983089983092983092983091983089983090-983097
983089983090983091 Tinker LF Bonds DE Margolis KL et al Low-at dietary pattern and risko treated diabetes mellitus in postmenopausal women the WomenrsquosHealth Initiative randomized controlled dietary modification trial Arch
Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
983089983090983093 Micha R Michas G Mozaffarian D Unprocessed red and processedmeats and risk o coronary artery disease and type 983090 diabetesmdashanupdated review o the evidence Curr Atheroscler Rep 983090983088983089983090983089983092983093983089983093-983090983092
983089983090983094 Lee JE McLerran DF Rolland B et al Meat intake and cause-specificmortality a pooled analysis o Asian prospective cohort studies Am JClin Nutr 983090983088983089983091983097983096983089983088983091983090-983092983089
983089983090983095 Forouhi NG Koulman A Sharp SJ et al Differences in the prospectiveassociation between individual plasma phospholipid saturated attyacids and incident type 983090 diabetes the EPIC-InterAct case-cohortstudy Lancet Diabetes Endocrinol 983090983088983089983092983090983096983089983088-983096
983089983090983096 Turcot V Brunet J Daneault C Tardi JC Des Rosiers C Lettre GValidation o atty acid intakes estimated by a ood requencyquestionnaire using erythrocyte atty acid profiling in the MontrealHeart Institute Biobank J Hum Nutr Diet 983090983088983089983092 wwwncbinlmnihgov
pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
983089983091983088 Sluijs I Forouhi NG Beulens JW et al The amount and type o dairyproduct intake and incident type 983090 diabetes results rom theEPIC-InterAct Study Am J Clin Nutr 983090983088983089983090983097983094983091983096983090-983097983088
983089983091983089 OrsquoConnor LM Lentjes MA Luben RN Khaw KT Wareham NJ ForouhiNG Dietary dairy product intake and incident type 983090 diabetes aprospective study using dietary data rom a 983095-day ood diaryDiabetologia 983090983088983089983092983093983095983097983088983097-983089983095
983089983091983090 Hudgins LC Hellerstein M Seidman C Neese R Diakun J Hirsch JHuman atty acid synthesis is stimulated by a eucaloric low at highcarbohydrate diet J Clin Invest 983089983097983097983094983097983095983090983088983096983089-983097983089
983089983091983091 Siler SQ Neese RA Hellerstein MK De novo lipogenesis lipid kineticsand whole-body lipid balances in humans aer acute alcoholconsumption Am J Clin Nutr 983089983097983097983097983095983088983097983090983096-983091983094
983089983091983092 Hodson L Skeaff CM Fielding BA Fatty acid composition o adiposetissue and blood in humans and its use as a biomarker o dietaryintake Prog Lipid Res 983090983088983088983096983092983095983091983092983096-983096983088
7232019 journal 2 newpdf
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RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
983089983091983094 Willett WC Ascherio A Trans atty acids are the effects only marginal Am J Public Health 983089983097983097983092983096983092983095983090983090-983092
983089983091983095 Danaei G Ding EL Mozaffarian D et al The preventable causes odeath in the United States comparative risk assessment o dietaryliestyle and metabolic risk actors PLoS Med 983090983088983088983097983094e983089983088983088983088983088983093983096
983089983091983096 Chiuve SE Rimm EB Manson JE et al Intake o total trans trans-983089983096983089
and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
The Norwegian Countries prospective cohort study983096983091
(983095983089 983092983094983092 participants 983090983093983096 year follow-up) found no
association between industrially produced trans fats
from partially hydrogenated vegetable (PHVO) or fish
oils (PHFO) and all cause mortality (983089983089 983097983096983088 deaths) The
multivariable adjusted risk ratio was 983088983097983094 (983097983093 confi-
dence interval 983088983096983096 to 983089983088983093 P=983088983089983089 for trend) for high
(ge983089983094983093 of energy) versus low (lt983088983089983093 of energy) PHVO
and 983089983088983088 (983088983097983090 to 983089983089983088 P=983088983089983089 for trend) for high (ge983090983091983093
of energy) versus low (lt983088983096983093 of energy) PHFO (fig 983092
shows the pooled risk ratio of PHVO and PHFO I 983090=983088
Phet=983088983093983090) Two studies showed that industrially pro-
duced trans fats are associated with CHD mortality
Total trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Industrial trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
Ruminant trans fats
All cause mortality
CHD mortality
CHD total
Ischemic stroke
Type diabetes
( to )
( to )
( to )
( to )
( to )
( to )
( to )
( to )
-
-
( to )
( to )
( to )
-
( to )
-
-
-
Outcome
Trans fatsprotective
Trans fatsharmful
Relative risk ( CI)
Risk ratio( CI)
I
()
-
-
-
Phet
lt
lt
-
-
-
lt
P
No of studiescomparisons
No of eventsparticipants
Fig 983092 | Summary most adjusted relative risks of total trans fat industrial trans fat and ruminant trans fat and all causemortality CHD mortality total CHD ischemic stroke and type 983090 diabetes For total trans fats effect estimate for is fixedeffect analysis all others random effects analyses P value is for Z test of no overall association between exposure and
outcome Phet is for test of no differences in association measure among studies I983090 is proportion of total variation in studyestimates from heterogeneity rather than sampling error
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 716thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
7
(983089983089983096 983089983088983092 to 983089983091983091 P=983088983088983088983097 I983090=983088 Phet=983088983094983096 fig 983092
appendix 983092 eFigures 983090983093-983090983096)983092983097 983096983091 Two other studies
showed that industrially produced trans fats are associ-
ated with total CHD (983089983092983090 983089983088983093 to 983089983097983090 P=983088983088983090 I983090=983091983092
Phet=983088983090983090)983096983088 983096983092 (fig 983092 appendix 983092 eFigures 983090983097-983091983090) We did
not find any prospective cohort studies of total intake of
industrially produced trans fats and risk of ischemic
stroke or type 983090 diabetes
Ruminant derived trans fats
In the Norwegian Countries prospective cohort study983096983091
the multivariable adjusted risk ratio for all cause mor-
tality was 983089983088983092 (983097983093 confidence interval 983088983097983090 to 983089983089983096
P=983088983093983089 I983090=983092 Phet=983088983091983089) for the highest versus lowest
categories of ruminant derived trans fats (fig 983092 appen-
dix 983092 eFigure 983091983091-983091983092) Two studies found no association
between ruminant derived trans fats and CHD mortal-
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
o increasing polyunsaturated at in place o saturated at asystematic review and meta-analysis o randomized controlled trialsPLoS Med 983090983088983089983088983095e983089983088983088983088983090983093983090
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Flickinger BD Trans atty acid intakes and ood sources in the US
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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predicts long-term weight loss and decreased type 983090 diabetes riskthe Finnish Diabetes Prevention Study Diabetologia 983090983088983088983094983092983097983097983089983090-983090983088
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RESEARCH
15
983096983091 Laake I Pedersen JI Selmer R et al A prospective study o intake otrans-atty acids rom ruminant at partially hydrogenated vegetableoils and marine oils and mortality rom CVD Br J Nutr 983090983088983089983090983089983088983096983095983092983091-983093983092
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983096983093 Jakobsen MU Overvad K Dyerberg J Heitmann BL Intake o ruminanttrans atty acids and risk o coronary heart disease Int J Epidemiol
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Palmitoleic acid other dairy at biomarkers and incident diabetesthe Multi-Ethnic Study o Atherosclerosis (MESA) Am J Clin Nutr 983090983088983089983091983097983095983096983093983092-983094983089
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Am J Clin Nutr 983090983088983089983092983089983088983088983089983093983091983090-983092983088983097983088 Centre or Evidence-Based Medicine Levels o evidence March 983090983088983088983097
983097983089 Mente A de Koning L Shannon HS Anand SS A systematic review o
the evidence supporting a causal link between dietary actors andcoronary heart disease Arch Intern Med 983090983088983088983097983089983094983097983094983093983097-983094983097
983097983090 Micha R Mozaffarian D Saturated at and cardiometabolic riskactors coronary heart disease stroke and diabetes a resh look atthe evidence Lipids 983090983088983089983088983092983093983096983097983091-983097983088983093
983097983091 Skeaff CM Miller J Dietary at and coronary heart disease summary oevidence rom prospective cohort and randomised controlled trials
Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983097983093 Stamler J Wentworth D Neaton JD Is relationship between serumcholesterol and risk o premature death rom coronary heart diseasecontinuous and graded Findings in 983091983093983094983090983090983090 primary screenees o theMultiple Risk Factor Intervention Trial (MRFIT) JAMA 983089983097983096983094983090983093983094983090983096983090983091-983096
983097983094 Kannel WB Neaton JD Wentworth D et al Overall and coronary heart
disease mortality rates in relation to major risk actors in 983091983090983093983091983092983096 menscreened or the MRFIT Multiple Risk Factor Intervention Trial AmHeart J 983089983097983096983094983089983089983090983096983090983093-983091983094
983097983095 Gordon T Kannel WB Castelli WP Dawber TR Lipoproteinscardiovascular disease and death The Framingham study Arch InternMed 983089983097983096983089983089983092983089983089983089983090983096-983091983089
983097983096 Giovannucci E Rimm EB Stamper MJ Colditz GA Ascherio A WillettWC Intake o at meat and fiber in relation to risk o colon cancer inmen Cancer Res 983089983097983097983092983093983092983090983091983097983088-983095
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983089983088983089 OrsquoSullivan TA Haekost K Mitrou F Lawrence D Food sources osaturated at and the association with mortality a meta-analysis Am JPublic Health 983090983088983089983091983089983088983091e983091983089-983092983090
983089983088983090 Rohrmann S Overvad K Bueno-de-Mesquita HB et al Meatconsumption and mortalitymdashresults rom the European Prospective
Investigation into Cancer and Nutrition BMC Med 983090983088983089983091983089983089983094983091983089983088983091 Zhu H Yang X Zhang C et al Red and processed meat intake is
associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
983089983088983092 Choi Y Song S Song Y Lee JE Consumption o red and processedmeat and esophageal cancer risk meta-analysis World JGastroenterol 983090983088983089983091983089983097983089983088983090983088-983097
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983089983088983094 World Cancer Research FundAmerican Institute or Cancer ResearchFood nutrition physical activity and the prevention o cancer aglobal Perspective World Cancer Research FundAmerican Instituteor Cancer Research 983090983088983088983095
983089983088983095 Tanasescu M Cho E Manson JE Hu FB Dietary at and cholesteroland the risk o cardiovascular disease among women with type 983090diabetes Am J Clin Nutr 983090983088983088983092983095983097983097983097983097-983089983088983088983093
983089983088983096 Trichopoulou A Psaltopoulou T Oranos P Trichopoulos D Diet andphysical activity in relation to overall mortality amongst adultdiabetics in a general population cohort J Intern Med 983090983088983088983094983090983093983097983093983096983091-983097983089
983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
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983089983089983089 Jakobsen MU OrsquoReilly EJ Heitmann BL et al Major types o dietary atand risk o coronary heart disease a pooled analysis o 983089983089 cohortstudies Am J Clin Nutr 983090983088983088983097983096983097983089983092983090983093-983091983090
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983089983089983094 Jakobsen MU Dethlesen C Joensen AM et al Intake o carbohydratescompared with intake o saturated atty acids and risk o myocardialinarction importance o the glycemic index Am J Clin Nutr 983090983088983089983088983097983089983089983095983094983092-983096
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Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
983089983090983093 Micha R Michas G Mozaffarian D Unprocessed red and processedmeats and risk o coronary artery disease and type 983090 diabetesmdashanupdated review o the evidence Curr Atheroscler Rep 983090983088983089983090983089983092983093983089983093-983090983092
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pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
983089983091983088 Sluijs I Forouhi NG Beulens JW et al The amount and type o dairyproduct intake and incident type 983090 diabetes results rom theEPIC-InterAct Study Am J Clin Nutr 983090983088983089983090983097983094983091983096983090-983097983088
983089983091983089 OrsquoConnor LM Lentjes MA Luben RN Khaw KT Wareham NJ ForouhiNG Dietary dairy product intake and incident type 983090 diabetes aprospective study using dietary data rom a 983095-day ood diaryDiabetologia 983090983088983089983092983093983095983097983088983097-983089983095
983089983091983090 Hudgins LC Hellerstein M Seidman C Neese R Diakun J Hirsch JHuman atty acid synthesis is stimulated by a eucaloric low at highcarbohydrate diet J Clin Invest 983089983097983097983094983097983095983090983088983096983089-983097983089
983089983091983091 Siler SQ Neese RA Hellerstein MK De novo lipogenesis lipid kineticsand whole-body lipid balances in humans aer acute alcoholconsumption Am J Clin Nutr 983089983097983097983097983095983088983097983090983096-983091983094
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RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
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and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
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983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
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controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
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983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
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Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
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983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
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983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
o increasing polyunsaturated at in place o saturated at asystematic review and meta-analysis o randomized controlled trialsPLoS Med 983090983088983089983088983095e983089983088983088983088983090983093983090
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Anal Control Expo Risk Assess 983090983088983089983090983090983097983096983094983089-983095983092983089983088 Kris-Etherton PM Leevre M Mensink RP Petersen B Fleming J
Flickinger BD Trans atty acid intakes and ood sources in the US
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983091 Salmeroacuten J Hu FB Manson JE et al Dietary at intake and risk o type983090 diabetes in women Am J Clin Nutr 983090983088983088983089983095983091983089983088983089983097-983090983094
983095983092 Simila ME Kontto JP Valsta LM Mannisto S Albanes D Virtamo JCarbohydrate substitution or at or protein and risk o type 983090 diabetesin male smokers Eur J Clin Nutr 983090983088983089983090983094983094983095983089983094-983090983089
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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983096983091 Laake I Pedersen JI Selmer R et al A prospective study o intake otrans-atty acids rom ruminant at partially hydrogenated vegetableoils and marine oils and mortality rom CVD Br J Nutr 983090983088983089983090983089983088983096983095983092983091-983093983092
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983097983089 Mente A de Koning L Shannon HS Anand SS A systematic review o
the evidence supporting a causal link between dietary actors andcoronary heart disease Arch Intern Med 983090983088983088983097983089983094983097983094983093983097-983094983097
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Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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983097983094 Kannel WB Neaton JD Wentworth D et al Overall and coronary heart
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Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
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pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
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RESEARCH
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983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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983090 Harcombe Z Baker JS Cooper SM et al Evidence rom randomisedcontrolled trials did not support the introduction o dietary atguidelines in 983089983097983095983095 and 983089983097983096983091 a systematic review and meta-analysisOpen Heart 983090983088983089983093983090e983088983088983088983089983097983094
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Flickinger BD Trans atty acid intakes and ood sources in the US
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
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983090983094 Gebauer SK Chardigny JM Jakobsen MU et al Effects o ruminanttrans atty acids on cardiovascular disease and cancer acomprehensive review o epidemiological clinical and mechanisticstudies Adv Nutr 983090983088983089983089983090983091983091983090-983093983092
983090983095 Wang T Cai MQ Meta-analysis o risk o trans atty acids on coronaryheart diseases Shanghai Jiao Tong Da Xue Xue Bao Yi Xue Ban 983090983088983089983089983091983089983089983089983094983092-983094983097
983090983096 Mozaffarian D Clarke R Quantitative effects on cardiovascular riskactors and coronary heart disease risk o replacing partiallyhydrogenated vegetable oils with other ats and oils Eur J Clin Nutr 983090983088983088983097983094983091S983090983090-S983091983091
983090983097 Mozaffarian D Aro A Willett WC Health effects o trans-atty acidsExperimental and observational evidence Eur J Clin Nutr 983090983088983088983097983094983091S983093-S983090983089
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
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RESEARCH
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983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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983093983092 Fehily AM Yarnell JW Sweetnam PM Elwood PC Diet and incidentischaemic heart disease the Caerphilly Study Br J Nutr 983089983097983097983091983094983097983091983088983091-983089983092
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983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
983094983088 Posner BM Cobb JL Belanger AJ Cupples LA DrsquoAgostino RB Stokes J983091rd Dietary lipid predictors o coronary heart disease in men TheFramingham Study Arch Intern Med 983089983097983097983089983089983093983089983089983089983096983089-983095
983094983089 Yamagishi K Iso H Kokubo Y et al Dietary intake o saturated attyacids and incident stroke and coronary heart disease in Japanesecommunities the JPHC Study Eur Heart J 983090983088983089983091983091983092983089983090983090983093-983091983090
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983091 Salmeroacuten J Hu FB Manson JE et al Dietary at intake and risk o type983090 diabetes in women Am J Clin Nutr 983090983088983088983089983095983091983089983088983089983097-983090983094
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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RESEARCH
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983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Tables (CCHS Cycle 983090983090)Vol 983089-983091 Health Canada Publications 983090983088983088983097983093 Wright JD Wang CY Kennedy-Stephenson J Jacobs Jr DR ErvinRBDietary intakes o ten key nutrients or public health 983089983097983097983097-983090983088983088983088National Center or Health Statistics 983090983088983088983091
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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at intake and early mortality patternsmdashdata rom The Malmo Diet andCancer Study J Intern Med 983090983088983088983093983090983093983096983089983093983091-983094983093
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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Tocopherol Beta-Carotene Cancer Prevention Study Am J Epidemiol 983089983097983097983095983089983092983093983096983095983094-983096983095
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J Med 983089983097983096983089983091983088983092983094983093-983095983088983093983089 Xu J Eilat-Adar S Loria C et al Dietary at intake and risk o coronary
heart disease the Strong Heart Study Am J Clin Nutr 983090983088983088983094983096983092983096983097983092-983097983088983090
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983093983091 Sauvaget C Nagano J Hayashi M Yamada M Animal protein animalat and cholesterol intakes and risk o cerebral inarction mortality inthe adult health study Stroke 983090983088983088983092983091983093983089983093983091983089-983095
983093983092 Fehily AM Yarnell JW Sweetnam PM Elwood PC Diet and incidentischaemic heart disease the Caerphilly Study Br J Nutr 983089983097983097983091983094983097983091983088983091-983089983092
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983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
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RESEARCH
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983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
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983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Atheroscler Rep 983090983088983089983088983089983090983091983096983092-983097983088983095 Mozaffarian D Micha R Wallace S Effects on coronary heart disease
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recommendations revision 983090983088983088983094 a scientific statement rom the AmericanHeart Association Nutrition Committee Circulation 983090983088983088983094983089983089983092983096983090-983097983094983089983095 US Department o Agriculture and US Department o Health and
Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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RESEARCH
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RESEARCH
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and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
saturated (PS) ratio conferred the greatest reduction in
risk of CVD983089983089983089 though these studies did not distinguish
between n-983091 and n-983094 fatty acids as the replacement choice
Several intervention studies that have replaced saturated
fat with polyunsaturated fats achieved relatively high PS
ratios (gt983089983088 to about 983090983093) through replacement of saturated
fat with predominantly soybean (n-983094 linoleic) and marine
oils (n-983091 eicosapentaenoic and docosahexaenoic acids
from sardines) At these levels significant CHD benefits
were seen983089983089983090-983089983089983092 consistent with the finding that favorable
effects of diets with reduced saturated fat on cardiovascu-
lar risk might depend on a significant reciprocal increase
in polyunsaturated fat983097983090 or high quality carbohydrate from
whole fruits vegetables pulses and grains which tend to
have a lower glycaemic index983089983089983094 In a meta-analysis of
cohort studies replacement of 983093 of energy from satu-
rated fat with linoleic acid (n-983094 PUFA) was associated with
a 983097 lower risk of CHD events (risk ratio 983088983097983089 983097983093 confi-
dence interval 983088983096983095 to 983088983097983094 983089983091 studies with 983091983089983088 983094983088983090 partici-
pants) and a 983089983091 lower risk of CHD deaths (983088983096983095 983088983096983090 to
983088983097983092)983089983095983096 A re-analysis of the Sydney Diet Heart Study and
updated meta-analysis however found no benefit and
possible harm associated with replacement of saturated
fat by linoleic acid (hazard ratio 983089983091983091 (983097983093 confidence
interval 983088983097983097 to 983089983095983097) for CHD death and 983089983090983095 (983088983097983096 to 983089983094983093)
for CVD) in secondary prevention trials983089983095983097 Replacement of
saturated fat with monounsaturated fat or carbohydrate
was not associated with significant reduction in CHD risk
but was associated with a small increase in risk of non-fa-
tal myocardial infarction983089983089983093 The relative risks associated
with different saturated fats or their food sources were not
importantly different with the exception of a single study
that noted replacement of saturated fat from meat with
saturated fat from dairy decreased risk of CVD983089983089983096 Othercomponents of these foods however could also be
responsible for these effects
Replacement of trans fats by carbohydrate
In the two studies that directly assessed the impact on
type 983090 diabetes of replacement of carbohydrate with
trans fat replacement of 983089 of energy from carbohy-
drate with trans fatty acids was associated with a 983090983091
increased risk (hazard ratio 983089983090983091 983097983093 confidence inter-
val 983089983088983090 to 983089983092983096)983095983091 and replacement of 983090 of energy from
carbohydrate with trans fatty acids was associated with
a 983091983097 increased risk (983089983091983097 983089983089983093 to 983089983094983095)983095983090 In the two stud-
ies that directly assessed the impact of replacement ofcarbohydrate with trans fats983094983092 983094983096 replacement was asso-
ciated with either no increased risk of stroke in men (risk
ratio 983088983096983094 983088983093983093 to 983089983091983090 per 983090 of energy)983094983092 or a small but
significant increase risk of stroke in older post-meno-
pausal women (983089983088983096 983089983088983088983092 to 983089983089983094 per 983090 g of intake)983094983096
Replacement of trans fat by unsaturated fats
Using data from two of the largest prospective cohort
studies Mozaffarian and Clarke983090983096 reported the adjusted
risk ratio of CHD for isocaloric replacement of 983090 of
energy from trans unsaturated fatty acids with saturated
fatty acids monounsaturated fatty acids or polyunsat-
urated fatty acids They found that replacement of 983090 ofenergy from trans fats with saturated fat would reduce
risk by 983089983095 (risk ratio 983088983096983091 983097983093 confidence interval 983088983095983093
to 983088983097983091) The reductions in risk were 983090983089 (983088983095983097 983088983095983088 to
983088983096983096) for replacement with monounsaturated fat and
983090983092 (983088983095983094 983088983094983095 to 983088983096983093) for replacement with polyunsat-
urated fat In the present analysis we found no new evi-
dence that would substantially alter these risks
Meaning of the study
This systematic review and meta-analysis of evidence
from large generally well designed observational stud-
ies does not support a robust association of saturated
fats with all cause mortality CHD CHD mortality isch-
emic stroke or diabetes in healthy individuals but the
choice of comparison nutrient (n-983094 andor n-983091 PUFA
MUFA refined or high quality carbohydrate) must be
carefully considered Few observational studies how-
ever modeled the effect of replacing saturated or trans
fats with other nutrients In large prospective studies
when polyunsaturated fats replace saturated fats risk
of CHD is reduced but not when MUFA or carbohydrate
is the replacement choice Higher compared with
lower intakes of trans fats are associated with a 983090983088-983091983088
increased risk of all cause mortality CHD and CHD mor-
tality regardless of choice of replacement nutrient but
associations with type 983090 diabetes and stroke are unclear
The association seems to be most consistently driven by
industrially produced trans fats probably because of
their higher intakes among participants during the fol-
low-up periods of the included studies Dietary guide-
lines for saturated and trans fatty acids must carefully
consider the effect of replacement nutrients
Unanswered questions and future research
Several questions could not be answered by our reviewFirst do different sources (for example animal v plant)
and chain lengths (odd v even) of saturated fat have dif-
ferent effects on health particularly with respect to risk
of diabetes The current evidence reviewed suggests
that dairy fats specifically odd chained saturated fatty
acids might be protective against type 983090 diabetes but
apart from recommendations for broad sources of fatty
acids (such as dairy v plant v animal flesh) it is not fea-
sible to separate different types of saturated fats with
respect to food choices because the foods contain a
combination of several saturated fats Second what is
the impact of saturated fats consumed in the context of
diverse background diets on health Notably the asso-ciation between certain foods and CHD cannot be pre-
dicted solely by their content of total saturated fats
because individual saturated fats might have different
cardiovascular effects and major food sources of satu-
rated fat contain other constituents that could influence
risk of CHD Third are there meaningful differences in
the choice of polyunsaturated fatmdashfor instance n-983091 or
n-983094mdashthat replaces saturated (or trans) fats in the diet
Current evidence suggests that either group of polyun-
saturated fats provide similar benefit Fourth is the
reported protective effect of trans-palmitoleic acid for
type 983090 diabetes robust and if so does the apparent
benefit extend to cardiovascular disease outcomesFifth do threshold levels of ruminant trans fatty acid
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1316thebmj 983164 BMJ 2015351h3978 983164 doi 101136bmjh3978
RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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recommendations revision 983090983088983088983094 a scientific statement rom the AmericanHeart Association Nutrition Committee Circulation 983090983088983088983094983089983089983092983096983090-983097983094983089983095 US Department o Agriculture and US Department o Health and
Human Services Dietary Guidelines or Americans 983090983088983089983088 983095th ed USGovernment Printing Office 983090983088983089983088
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Epidemiology J Clin Epidemiol 983090983088983089983089983094983092983091983096983088-983090983090983091 World Health Organization WHO handbook or guideline
development httpappswhointirisbitstream983089983088983094983094983093983095983093983089983092983094983089983097983095983096983097983090983092983089983093983092983096983092983092983089_engpd
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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RESEARCH
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atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
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copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
Appendix 983093 GRADE evidence profile for prospective
cohort studies of saturated fatty acids and health
outcomes
Appendix 983094 GRADE evidence profile for prospective
cohort studies of trans fatty acids and health outcomes
7232019 journal 2 newpdf
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RESEARCH
13
intakes exist above which cardiovascular risk increases
in a similar fashion to that seen with industrial trans
fatty acids Finally what should be the ldquogoldrdquo standard
for measurement of fatty acid intake Development of
reliable and valid methods of assessing fatty acid
intakes in large longitudinal cohort studies with suffi-
cient follow-up to observe clinical events and deaths
must remain a priority to improve the quality of the evi-
dence on which dietary advice is based
We are grateul to Viranda Jayalath (University o Toronto) or hisassistance developing the data abstraction orms We thank PaulKnekt Anthony Hanley and Ingrid Santaren or providing data andHannia Campos and Kay-tee Khaw or clariying aspects o theirstudies Christine Neilson and Natalie Campbell or their assistancewith the literature search Michael Zulyniak or assistance withpreparing the manuscript or publication and the members o theWHO Nutrition Guidance Advisory Group (NUGAG) Subgroup on Dietand Health or their helpul comments on the dra results WHOagreed to the publication o this systematic review in a scientificjournal because it serves as the background evidence review orupdating WHO guidelines on saturated and trans atty acids andshould thereore be available widely We appreciate the helpulcomments o peer reviewers Arne Atrup Ronald Krauss JM Chardigny
and Evangeline Mantzioris which have greatly improved the quality othe manuscript
Contributors Study concept and design RJdeS SSA JB AMeDevelopment and implementation o literature search strategy EU TKAcquisition o data including review o literature search results anddata abstraction RJdeS EU TK AMe AMa AIC VH PB Analysis andinterpretation o data RJdeS AMe SSA JB HS Draing o themanuscript RJdeS AMe VH AIC Critical revision o the manuscript orimportant intellectual content all authors Statistical analysis RJdeS
JB Administrative technical and material support EU TK AM Studysupervision SSA JB RJdeS is guarantor
Funding This study was unded by WHO which derayed costsassociated with preparing the dra manuscript including inormationspecialist and technical support and article retrieval costs Thissystematic review was presented by RJdeS at the 983093th NutritionGuidelines Advisory Group (NUGAG) meeting in Hangzhou China (983092-983095March 983090983088983089983091) the 983094th NUGAG meeting in Copenhagen Denmark (983090983089-983090983092
Oct 983090983088983089983091) and the 983095th NUGAG meeting in Geneva Switzerland (983097-983089983090Sept 983090983088983089983092) and via skype during the 983096th NUGAG meeting in Fukuoka
Japan (983097-983089983090 June 983090983088983089983093) WHO covered travel and accommodation costsor RJdeS to attend these meetings The research questions or thereview were discussed and developed by the WHO Nutrition GuidanceExpert Advisory Group (NUGAG) Subgroup on Diet and Health and theprotocol was agreed by the WHO NUGAG Subgroup on Diet and Healthhowever neither WHO nor the WHO NUGAG Subgroup on Diet andHealth had any role in data collection or analysis
Competing interests All authors have completed the UnifiedCompeting Interest orm at wwwicmjeorgcoi_disclosurepd(available on request rom the corresponding author) and declareRJdeS has received a Canadian Institutes or Health Research (CIHR)postdoctoral ellowship VH has received a Province o Ontariograduate scholarship and research support rom the CanadianInstitutes o Health Research (CIHR) AIC has received a Province oOntario graduate scholarship
Ethical approval Not required
Transparency statement RJdeS affirms that the manuscript is anhonest accurate and transparent account o the study being reportedthat no important aspects o the study have been omitted and thatany discrepancies are disclosed
Data sharing The ull dataset and statistical code are available romthe corresponding author
This is an Open Access article distributed in accordance with theCreative Commons Attribution Non Commercial (CC BY-NC 983092983088) licensewhich permits others to distribute remix adapt build upon this worknon-commercially and license their derivative works on differentterms provided the original work is properly cited and the use isnon-commercial See httpcreativecommonsorglicensesby-nc983092983088
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Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
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Tocopherol Beta-Carotene Cancer Prevention Study Am J Epidemiol 983089983097983097983095983089983092983093983096983095983094-983096983095
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J Med 983089983097983096983089983091983088983092983094983093-983095983088983093983089 Xu J Eilat-Adar S Loria C et al Dietary at intake and risk o coronary
heart disease the Strong Heart Study Am J Clin Nutr 983090983088983088983094983096983092983096983097983092-983097983088983090
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983093983091 Sauvaget C Nagano J Hayashi M Yamada M Animal protein animalat and cholesterol intakes and risk o cerebral inarction mortality inthe adult health study Stroke 983090983088983088983092983091983093983089983093983091983089-983095
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983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
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983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
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983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
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adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
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983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
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RESEARCH
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the evidence supporting a causal link between dietary actors andcoronary heart disease Arch Intern Med 983090983088983088983097983089983094983097983094983093983097-983094983097
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Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
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associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
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Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
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pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
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RESEARCH
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983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
983090983097 Mozaffarian D Aro A Willett WC Health effects o trans-atty acidsExperimental and observational evidence Eur J Clin Nutr 983090983088983088983097983094983091S983093-S983090983089
983091983088 Wells GA Shea B OrsquoConnell D et al The Newcastle-Ottawa Scale(NOS) or assessing the quality o nonrandomised studies inmeta-analyses wwwohricaprogramsclinical_epidemiologyoxordasp
983091983089 DerSimonian R Laird N Meta-analysis in clinical trials Control ClinTrials 983089983097983096983094983095983089983095983095-983096983096
983091983090 Higgins JP Thompson SG Deeks JJ Altman DG Measuringinconsistency in meta-analyses BMJ 983090983088983088983091983091983090983095983093983093983095-983094983088983091983091 Borenstein M Hedges LV Higgins JPT Rothstein HR Introduction to
meta-analysis John Wiley 983090983088983088983096983091983092 Thompson SG Higgins JP How should meta-regression analyses be
undertaken and interpreted Stat Med 983090983088983088983090983090983089983089983093983093983097-983095983091983091983093 Greenhouse JB Iyengar S Sensitivity analysis and diagnostics In
Cooper HM Hedges LV Valentine JC eds The handbook o researchsynthesis and meta-analysis 983090nd ed Russell Sage Foundation983090983088983088983097983092983090983091-983090983092
983091983094 Sterne JA Gavaghan D Egger M Publication and related bias inmeta-analysis power o statistical tests and prevalence in theliterature J Clin Epidemiol 983090983088983088983088983093983091983089983089983089983097-983090983097
983091983095 Duval S Tweedie R Trim and fill a simple unnel-plot-based methodo testing and adjusting or publication bias in meta-analysisBiometrics 983090983088983088983088983093983094983092983093983093-983094983091
983091983096 Kromhout D Bloemberg B Feskens E Menotti A Nissinen ASaturated at vitamin C and smoking predict long-term populationall-cause mortality rates in the Seven Countries Study Int J Epidemiol
983090983088983088983088983090983097983090983094983088-983093983091983097 Leosdottir M Nilsson PM Nilsson JA Mansson H Berglund G Dietary
at intake and early mortality patternsmdashdata rom The Malmo Diet andCancer Study J Intern Med 983090983088983088983093983090983093983096983089983093983091-983094983093
983092983088 Mann JI Appleby PN Key TJ Thorogood M Dietary determinants oischaemic heart disease in health conscious individuals Heart 983089983097983097983095983095983096983092983093983088-983093
983092983089 Tucker KL Hallrisch J Qiao N Muller D Andres R Fleg JL Thecombination o high ruit and vegetable and low saturated at intakesis more protective against mortality in aging men than is either alonethe Baltimore Longitudinal Study o Aging J Nutr 983090983088983088983093983089983091983093983093983093983094-983094983089
983092983090 Chien KL Lin HJ Hsu HC et al Comparison o predictive perormanceo various atty acids or the risk o cardiovascular disease events andall-cause deaths in a community-based cohort Atherosclerosis 983090983088983089983091983090983091983088983089983092983088-983095
983092983091 Wakai K Naito M Date C Iso H Tamakoshi A Group JS Dietaryintakes o at and total mortality among Japanese populations with alow at intake the Japan Collaborative Cohort (JACC) Study Nutr
Metab (Lond) 983090983088983089983092983089983089983089983090983092983092 Ascherio A Rimm EB Giovannucci EL Spiegelman D Stamper MWillett WC Dietary at and risk o coronary heart disease in mencohort ollow up study in the United States BMJ 983089983097983097983094983091983089983091983096983092-983097983088
983092983093 Boniace DR Tef ME Dietary ats and 983089983094-year coronary heart diseasemortality in a cohort o men and women in Great Britain Eur J ClinNutr 983090983088983088983090983093983094983095983096983094-983097983090
983092983094 Esrey KL Joseph L Grover SA Relationship between dietary intakeand coronary heart disease mortality lipid research clinics prevalenceollow-up study J Clin Epidemiol 983089983097983097983094983092983097983090983089983089-983094
983092983095 Goldbourt U Yaari S Medalie JH Factors predictive o long-termcoronary heart disease mortality among 983089983088983088983093983097 male Israeli civilservants and municipal employees A 983090983091-year mortality ollow-up inthe Israeli Ischemic Heart Disease Study Cardiology 983089983097983097983091983096983090983089983088983088-983090983089
983092983096 Kushi LH Lew RA Stare FJ et al Diet and 983090983088-year mortality romcoronary heart disease The Ireland-Boston Diet-Heart Study N Engl JMed 983089983097983096983093983091983089983090983096983089983089-983096
983092983097 Pietinen P Ascherio A Korhonen P et al Intake o atty acids and risko coronary heart disease in a cohort o Finnish men The Alpha-
Tocopherol Beta-Carotene Cancer Prevention Study Am J Epidemiol 983089983097983097983095983089983092983093983096983095983094-983096983095
983093983088 Shekelle RB Shryock AM Paul O et al Diet serum cholesterol anddeath rom coronary heart disease The Western Electric study N Engl
J Med 983089983097983096983089983091983088983092983094983093-983095983088983093983089 Xu J Eilat-Adar S Loria C et al Dietary at intake and risk o coronary
heart disease the Strong Heart Study Am J Clin Nutr 983090983088983088983094983096983092983096983097983092-983097983088983090
983093983090 Virtanen JK Mursu J Tuomainen TP Voutilainen S Dietary atty acidsand risk o coronary heart disease in men the Kuopio ischemic heartdisease risk actor study Arterioscler Thromb Vasc Biol 983090983088983089983092983091983092983090983094983095983097-983096983095
983093983091 Sauvaget C Nagano J Hayashi M Yamada M Animal protein animalat and cholesterol intakes and risk o cerebral inarction mortality inthe adult health study Stroke 983090983088983088983092983091983093983089983093983091983089-983095
983093983092 Fehily AM Yarnell JW Sweetnam PM Elwood PC Diet and incidentischaemic heart disease the Caerphilly Study Br J Nutr 983089983097983097983091983094983097983091983088983091-983089983092
983093983093 Howard BV Van Horn L Hsia J et al Low-at dietary pattern and risk ocardiovascular disease the Womenrsquos Health Initiative RandomizedControlled Dietary Modification Trial JAMA 983090983088983088983094983090983097983093983094983093983093-983094983094
983093983094 Jakobsen MU Overvad K Dyerberg J Schroll M Heitmann BL Dietaryat and risk o coronary heart disease possible effect modification bygender and age Am J Epidemiol 983090983088983088983092983089983094983088983089983092983089-983097
983093983095 Leosdottir M Nilsson PM Nilsson JA Berglund G Cardiovascularevent risk in relation to dietary at intake in middle-aged individualsdata rom The Malmo Diet and Cancer Study Eur J Cardiovasc PrevRehabil 983090983088983088983095983089983092983095983088983089-983094
983093983096 McGee D Reed D Stemmerman G Rhoads G Yano K Feinleib M Therelationship o dietary at and cholesterol to mortality in 983089983088 years the
Honolulu Heart Program Int J Epidemiol 983089983097983096983093983089983092983097983095-983089983088983093983093983097 Oh K Hu FB Manson JE Stamper MJ Willett WC Dietary at intakeand risk o coronary heart disease in women 983090983088 years o ollow-up othe nursesrsquo health study Am J Epidemiol 983090983088983088983093983089983094983089983094983095983090-983097
983094983088 Posner BM Cobb JL Belanger AJ Cupples LA DrsquoAgostino RB Stokes J983091rd Dietary lipid predictors o coronary heart disease in men TheFramingham Study Arch Intern Med 983089983097983097983089983089983093983089983089983089983096983089-983095
983094983089 Yamagishi K Iso H Kokubo Y et al Dietary intake o saturated attyacids and incident stroke and coronary heart disease in Japanesecommunities the JPHC Study Eur Heart J 983090983088983089983091983091983092983089983090983090983093-983091983090
983094983090 De Goede J Soedamah-Muthu SS Trichia E Geleijnse JM Kromhout DDietary intake o saturated at by ood source and incident coronaryheart disease The zutphen elderly study Circulation 983090983088983089983093983089983091983089
983094983091 Atkinson C Whitley E Ness A Baker I Associations between types odietary at and fish intake and risk o stroke in the CaerphillyProspective Study (CaPS) Public Health 983090983088983089983089983089983090983093983091983092983093-983096
983094983092 Gillman MW Cupples LA Millen BE Ellison RC Wol PA Inverseassociation o dietary at with development o ischemic stroke in men
983094983093 He K Merchant A Rimm EB et al Dietary at intake and risk o strokein male US healthcare proessionals 983089983092 year prospective cohortstudy BMJ 983090983088983088983091983091983090983095983095983095983095-983096983090
983094983094 Misirli G Benetou V Lagiou P Bamia C Trichopoulos D TrichopoulouA Relation o the traditional Mediterranean diet to cerebrovasculardisease in a Mediterranean population Am J Epidemiol 983090983088983089983090983089983095983094983089983089983096983093-983097983090
983094983095 Seino F Date C Nakayama T et al Dietary lipids and incidence ocerebral inarction in a Japanese rural community J Nutr Sci Vitaminol(Tokyo) 983089983097983097983095983092983091983096983091-983097983097
983094983096 Wiberg B Sundstrom J Arnlov J et al Metabolic risk actors or strokeand transient ischemic attacks in middle-aged men a community-based study with long-term ollow-up Stroke 983090983088983088983094983091983095983090983096983097983096-983097983088983091
983094983097 Yaemsiri S Sen S Tinker L Rosamond W Wassertheil-Smoller S He KTrans at aspirin and ischemic stroke in postmenopausal women
Ann Neurol 983090983088983089983090983095983090983095983088983092-983089983093983095983088 Yamagishi K Folsom AR Steffen LM ARIC Study Investigators Plasma
atty acid composition and incidence ischemic stroke in middle-aged
adults the atherosclerosis risk in communities (ARIC) studyCerebrovasc Dis 983090983088983089983091983091983094983091983096-983092983094983095983089 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intake
and type 983090 diabetes risk in middle-aged Australian women Resultsrom the Australian Longitudinal Study on Womenrsquos Health PublicHealth Nutr 983090983088983089983092983089983095983089983093983096983095-983097983092
983095983090 Meyer KA Kushi LH Jacobs Jr DR Folsom AR Dietary at and incidenceo type 983090 diabetes in older Iowa women Diabetes Care 983090983088983088983089983090983092983089983093983090983096-983091983093
983095983091 Salmeroacuten J Hu FB Manson JE et al Dietary at intake and risk o type983090 diabetes in women Am J Clin Nutr 983090983088983088983089983095983091983089983088983089983097-983090983094
983095983092 Simila ME Kontto JP Valsta LM Mannisto S Albanes D Virtamo JCarbohydrate substitution or at or protein and risk o type 983090 diabetesin male smokers Eur J Clin Nutr 983090983088983089983090983094983094983095983089983094-983090983089
983095983093 Song Y Manson JE Buring JE Liu S A prospective study o red meatconsumption and type 983090 diabetes in middle-aged and elderly womenThe Womenrsquos Health study Diabetes Care 983090983088983088983092983090983095983090983089983088983096-983089983093
983095983094 Van Dam RM Willett WC Rimm EB Stamper MJ Hu FB Dietary at andmeat intake in relation to risk o type 983090 diabetes in men Diabetes Care
983090983088983088983090983090983093983092983089983095-983090983092983095983095 Lindstrom J Peltonen M Eriksson JG et al High-fibre low-at diet
predicts long-term weight loss and decreased type 983090 diabetes riskthe Finnish Diabetes Prevention Study Diabetologia 983090983088983088983094983092983097983097983089983090-983090983088
983095983096 Mahendran Y Agren J Uusitupa M et al Association o erythrocytemembrane atty acids with changes in glycemia and risk o type 983090diabetes Am J Clin Nutr 983090983088983089983092983097983097983095983097-983096983093
983095983097 Kiage JN Merrill PD Robinson CJ et al Intake o trans at and all-causemortality in the Reasons or Geographical and Racial Differences inStroke (REGARDS) cohort Am J Clin Nutr 983090983088983089983091983097983095983089983089983090983089-983090983096
983096983088 Oomen CM Ocke MC Feskens EJ van Erp-Baart MA Kok FJ KromhoutD Association between trans atty acid intake and 983089983088-year risk ocoronary heart disease in the Zutphen Elderly Study a prospectivepopulation-based study Lancet 983090983088983088983089983091983093983095983095983092983094-983093983089
983096983089 Kiage JN Merrill PD Judd SE et al Intake o trans at and incidence ostroke in the REasons or Geographic And Racial Differences in Stroke(REGARDS) cohort Am J Clin Nutr 983090983088983089983092983097983097983089983088983095983089-983094
983096983090 Wang Q Imamura F Ma W et al Circulating and dietary trans-attyacids and incident type-983090 diabetes mellitus in older adults Thecardiovascular health study Circulation 983090983088983089983092983089983090983097983089983088983097983097-983089983088983095
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983096983091 Laake I Pedersen JI Selmer R et al A prospective study o intake otrans-atty acids rom ruminant at partially hydrogenated vegetableoils and marine oils and mortality rom CVD Br J Nutr 983090983088983089983090983089983088983096983095983092983091-983093983092
983096983092 Willett WC Stamper MJ Manson JE et al Intake o trans atty acidsand risk o coronary heart disease among women Lancet 983089983097983097983091983091983092983089983093983096983089-983093
983096983093 Jakobsen MU Overvad K Dyerberg J Heitmann BL Intake o ruminanttrans atty acids and risk o coronary heart disease Int J Epidemiol
983090983088983088983096983091983095983089983095983091-983096983090983096983094 Mozaffarian D Cao H King IB et al Trans-palmitoleic acid metabolicrisk actors and new-onset diabetes in US adults a cohort study
Ann Intern Med 983090983088983089983088983089983093983091983095983097983088-983097983096983095 Mozaffarian D de Oliveira Otto MC Lemaitre RN et al trans-
Palmitoleic acid other dairy at biomarkers and incident diabetesthe Multi-Ethnic Study o Atherosclerosis (MESA) Am J Clin Nutr 983090983088983089983091983097983095983096983093983092-983094983089
983096983096 Yakoob MY Shi P Hu FB et al Circulating biomarkers o dairy at andincident type 983090 diabetes in two US prospective cohort studiesCirculation 983090983088983089983092983089983090983097
983096983097 Santaren ID Watkins SM Liese AD et al Serum pentadecanoic acid(983089983093983088) a short-term marker o dairy ood intake is inverselyassociated with incident type 983090 diabetes and its underlying disorders
Am J Clin Nutr 983090983088983089983092983089983088983088983089983093983091983090-983092983088983097983088 Centre or Evidence-Based Medicine Levels o evidence March 983090983088983088983097
983097983089 Mente A de Koning L Shannon HS Anand SS A systematic review o
the evidence supporting a causal link between dietary actors andcoronary heart disease Arch Intern Med 983090983088983088983097983089983094983097983094983093983097-983094983097
983097983090 Micha R Mozaffarian D Saturated at and cardiometabolic riskactors coronary heart disease stroke and diabetes a resh look atthe evidence Lipids 983090983088983089983088983092983093983096983097983091-983097983088983093
983097983091 Skeaff CM Miller J Dietary at and coronary heart disease summary oevidence rom prospective cohort and randomised controlled trials
Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983097983093 Stamler J Wentworth D Neaton JD Is relationship between serumcholesterol and risk o premature death rom coronary heart diseasecontinuous and graded Findings in 983091983093983094983090983090983090 primary screenees o theMultiple Risk Factor Intervention Trial (MRFIT) JAMA 983089983097983096983094983090983093983094983090983096983090983091-983096
983097983094 Kannel WB Neaton JD Wentworth D et al Overall and coronary heart
disease mortality rates in relation to major risk actors in 983091983090983093983091983092983096 menscreened or the MRFIT Multiple Risk Factor Intervention Trial AmHeart J 983089983097983096983094983089983089983090983096983090983093-983091983094
983097983095 Gordon T Kannel WB Castelli WP Dawber TR Lipoproteinscardiovascular disease and death The Framingham study Arch InternMed 983089983097983096983089983089983092983089983089983089983090983096-983091983089
983097983096 Giovannucci E Rimm EB Stamper MJ Colditz GA Ascherio A WillettWC Intake o at meat and fiber in relation to risk o colon cancer inmen Cancer Res 983089983097983097983092983093983092983090983091983097983088-983095
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983089983088983089 OrsquoSullivan TA Haekost K Mitrou F Lawrence D Food sources osaturated at and the association with mortality a meta-analysis Am JPublic Health 983090983088983089983091983089983088983091e983091983089-983092983090
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Investigation into Cancer and Nutrition BMC Med 983090983088983089983091983089983089983094983091983089983088983091 Zhu H Yang X Zhang C et al Red and processed meat intake is
associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
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983089983088983095 Tanasescu M Cho E Manson JE Hu FB Dietary at and cholesteroland the risk o cardiovascular disease among women with type 983090diabetes Am J Clin Nutr 983090983088983088983092983095983097983097983097983097-983089983088983088983093
983089983088983096 Trichopoulou A Psaltopoulou T Oranos P Trichopoulos D Diet andphysical activity in relation to overall mortality amongst adultdiabetics in a general population cohort J Intern Med 983090983088983088983094983090983093983097983093983096983091-983097983089
983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
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983089983089983089 Jakobsen MU OrsquoReilly EJ Heitmann BL et al Major types o dietary atand risk o coronary heart disease a pooled analysis o 983089983089 cohortstudies Am J Clin Nutr 983090983088983088983097983096983097983089983092983090983093-983091983090
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983089983089983091 Leren P The Oslo diet-heart study Eleven-year report Circulation 983089983097983095983088983092983090983097983091983093-983092983090
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983089983089983094 Jakobsen MU Dethlesen C Joensen AM et al Intake o carbohydratescompared with intake o saturated atty acids and risk o myocardialinarction importance o the glycemic index Am J Clin Nutr 983090983088983089983088983097983089983089983095983094983092-983096
983089983089983095 Hu FB Stamper MJ Manson JE et al Dietary saturated ats and theirood sources in relation to the risk o coronary heart disease inwomen Am J Clin Nutr 983089983097983097983097983095983088983089983088983088983089-983096
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at by ood source and incident cardiovascular disease theMulti-Ethnic Study o Atherosclerosis Am J Clin Nutr 983090983088983089983090983097983094983091983097983095-983092983088983092
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983089983090983091 Tinker LF Bonds DE Margolis KL et al Low-at dietary pattern and risko treated diabetes mellitus in postmenopausal women the WomenrsquosHealth Initiative randomized controlled dietary modification trial Arch
Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
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pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
983089983091983088 Sluijs I Forouhi NG Beulens JW et al The amount and type o dairyproduct intake and incident type 983090 diabetes results rom theEPIC-InterAct Study Am J Clin Nutr 983090983088983089983090983097983094983091983096983090-983097983088
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983089983091983090 Hudgins LC Hellerstein M Seidman C Neese R Diakun J Hirsch JHuman atty acid synthesis is stimulated by a eucaloric low at highcarbohydrate diet J Clin Invest 983089983097983097983094983097983095983090983088983096983089-983097983089
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RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
983089983091983094 Willett WC Ascherio A Trans atty acids are the effects only marginal Am J Public Health 983089983097983097983092983096983092983095983090983090-983092
983089983091983095 Danaei G Ding EL Mozaffarian D et al The preventable causes odeath in the United States comparative risk assessment o dietaryliestyle and metabolic risk actors PLoS Med 983090983088983088983097983094e983089983088983088983088983088983093983096
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and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
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Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
Appendix 983093 GRADE evidence profile for prospective
cohort studies of saturated fatty acids and health
outcomes
Appendix 983094 GRADE evidence profile for prospective
cohort studies of trans fatty acids and health outcomes
7232019 journal 2 newpdf
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RESEARCH
15
983096983091 Laake I Pedersen JI Selmer R et al A prospective study o intake otrans-atty acids rom ruminant at partially hydrogenated vegetableoils and marine oils and mortality rom CVD Br J Nutr 983090983088983089983090983089983088983096983095983092983091-983093983092
983096983092 Willett WC Stamper MJ Manson JE et al Intake o trans atty acidsand risk o coronary heart disease among women Lancet 983089983097983097983091983091983092983089983093983096983089-983093
983096983093 Jakobsen MU Overvad K Dyerberg J Heitmann BL Intake o ruminanttrans atty acids and risk o coronary heart disease Int J Epidemiol
983090983088983088983096983091983095983089983095983091-983096983090983096983094 Mozaffarian D Cao H King IB et al Trans-palmitoleic acid metabolicrisk actors and new-onset diabetes in US adults a cohort study
Ann Intern Med 983090983088983089983088983089983093983091983095983097983088-983097983096983095 Mozaffarian D de Oliveira Otto MC Lemaitre RN et al trans-
Palmitoleic acid other dairy at biomarkers and incident diabetesthe Multi-Ethnic Study o Atherosclerosis (MESA) Am J Clin Nutr 983090983088983089983091983097983095983096983093983092-983094983089
983096983096 Yakoob MY Shi P Hu FB et al Circulating biomarkers o dairy at andincident type 983090 diabetes in two US prospective cohort studiesCirculation 983090983088983089983092983089983090983097
983096983097 Santaren ID Watkins SM Liese AD et al Serum pentadecanoic acid(983089983093983088) a short-term marker o dairy ood intake is inverselyassociated with incident type 983090 diabetes and its underlying disorders
Am J Clin Nutr 983090983088983089983092983089983088983088983089983093983091983090-983092983088983097983088 Centre or Evidence-Based Medicine Levels o evidence March 983090983088983088983097
983097983089 Mente A de Koning L Shannon HS Anand SS A systematic review o
the evidence supporting a causal link between dietary actors andcoronary heart disease Arch Intern Med 983090983088983088983097983089983094983097983094983093983097-983094983097
983097983090 Micha R Mozaffarian D Saturated at and cardiometabolic riskactors coronary heart disease stroke and diabetes a resh look atthe evidence Lipids 983090983088983089983088983092983093983096983097983091-983097983088983093
983097983091 Skeaff CM Miller J Dietary at and coronary heart disease summary oevidence rom prospective cohort and randomised controlled trials
Ann Nutr Metab 983090983088983088983097983093983093983089983095983091-983090983088983089983097983092 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary atty
acids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983097983093 Stamler J Wentworth D Neaton JD Is relationship between serumcholesterol and risk o premature death rom coronary heart diseasecontinuous and graded Findings in 983091983093983094983090983090983090 primary screenees o theMultiple Risk Factor Intervention Trial (MRFIT) JAMA 983089983097983096983094983090983093983094983090983096983090983091-983096
983097983094 Kannel WB Neaton JD Wentworth D et al Overall and coronary heart
disease mortality rates in relation to major risk actors in 983091983090983093983091983092983096 menscreened or the MRFIT Multiple Risk Factor Intervention Trial AmHeart J 983089983097983096983094983089983089983090983096983090983093-983091983094
983097983095 Gordon T Kannel WB Castelli WP Dawber TR Lipoproteinscardiovascular disease and death The Framingham study Arch InternMed 983089983097983096983089983089983092983089983089983089983090983096-983091983089
983097983096 Giovannucci E Rimm EB Stamper MJ Colditz GA Ascherio A WillettWC Intake o at meat and fiber in relation to risk o colon cancer inmen Cancer Res 983089983097983097983092983093983092983090983091983097983088-983095
983097983097 Smith-Warner SA Spiegelman D Adami HO et al Types o dietary atand breast cancer a pooled analysis o cohort studies Int J Cancer 983090983088983088983089983097983090983095983094983095-983095983092
983089983088983088 Larsson SC Orsini N Red meat and processed meat consumption andall-cause mortality a meta-analysis Am J Epidemiol 983090983088983089983091
983089983088983089 OrsquoSullivan TA Haekost K Mitrou F Lawrence D Food sources osaturated at and the association with mortality a meta-analysis Am JPublic Health 983090983088983089983091983089983088983091e983091983089-983092983090
983089983088983090 Rohrmann S Overvad K Bueno-de-Mesquita HB et al Meatconsumption and mortalitymdashresults rom the European Prospective
Investigation into Cancer and Nutrition BMC Med 983090983088983089983091983089983089983094983091983089983088983091 Zhu H Yang X Zhang C et al Red and processed meat intake is
associated with higher gastric cancer risk a meta-analysis oepidemiological observational studies PLoS One 983090983088983089983091983096e983095983088983097983093983093
983089983088983092 Choi Y Song S Song Y Lee JE Consumption o red and processedmeat and esophageal cancer risk meta-analysis World JGastroenterol 983090983088983089983091983089983097983089983088983090983088-983097
983089983088983093 Aune D Chan DS Vieira AR et al Red and processed meat intake andrisk o colorectal adenomas a systematic review and meta-analysis oepidemiological studies Cancer Causes Control 983090983088983089983091983090983092983094983089983089-983090983095
983089983088983094 World Cancer Research FundAmerican Institute or Cancer ResearchFood nutrition physical activity and the prevention o cancer aglobal Perspective World Cancer Research FundAmerican Instituteor Cancer Research 983090983088983088983095
983089983088983095 Tanasescu M Cho E Manson JE Hu FB Dietary at and cholesteroland the risk o cardiovascular disease among women with type 983090diabetes Am J Clin Nutr 983090983088983088983092983095983097983097983097983097-983089983088983088983093
983089983088983096 Trichopoulou A Psaltopoulou T Oranos P Trichopoulos D Diet andphysical activity in relation to overall mortality amongst adultdiabetics in a general population cohort J Intern Med 983090983088983088983094983090983093983097983093983096983091-983097983089
983089983088983097 Lichtenstein AH Schwab US Relationship o dietary at to glucosemetabolism Atherosclerosis 983090983088983088983088983089983093983088983090983090983095-983092983091
983089983089983088 Franz MJ Bantle JP Beebe CA et al Evidence-based nutritionprinciples and recommendations or the treatment and prevention odiabetes and related complications Diabetes Care 983090983088983088983091983090983094 Suppl983089S983093983089-983094983089
983089983089983089 Jakobsen MU OrsquoReilly EJ Heitmann BL et al Major types o dietary atand risk o coronary heart disease a pooled analysis o 983089983089 cohortstudies Am J Clin Nutr 983090983088983088983097983096983097983089983092983090983093-983091983090
983089983089983090 Dayton S Pearce ML Hashimoto S Dixon WJ Tomiyasu U A controlledclinical trial o a diet high in unsaturated at in preventingcomplications o atherosclerosis Circulation 983089983097983094983097983092983088II-983089-II-983094983091
983089983089983091 Leren P The Oslo diet-heart study Eleven-year report Circulation 983089983097983095983088983092983090983097983091983093-983092983090
983089983089983092 Turpeinen O Karvonen MJ Pekkarinen M Miettinen M Elosuo RPaavilainen E Dietary prevention o coronary heart disease theFinnish Mental Hospital Study Int J Epidemiol 983089983097983095983097983096983097983097-983089983089983096
983089983089983093 Liu S Willett WC Stamper MJ et al A prospective study o dietaryglycemic load carbohydrate intake and risk o coronary heart diseasein US women Am J Clin Nutr 983090983088983088983088983095983089983089983092983093983093-983094983089
983089983089983094 Jakobsen MU Dethlesen C Joensen AM et al Intake o carbohydratescompared with intake o saturated atty acids and risk o myocardialinarction importance o the glycemic index Am J Clin Nutr 983090983088983089983088983097983089983089983095983094983092-983096
983089983089983095 Hu FB Stamper MJ Manson JE et al Dietary saturated ats and theirood sources in relation to the risk o coronary heart disease inwomen Am J Clin Nutr 983089983097983097983097983095983088983089983088983088983089-983096
983089983089983096 De Oliveira Otto MC Mozaffarian D et al Dietary intake o saturated
at by ood source and incident cardiovascular disease theMulti-Ethnic Study o Atherosclerosis Am J Clin Nutr 983090983088983089983090983097983094983091983097983095-983092983088983092
983089983089983097 Rasmussen BM Vessby B Uusitupa M et al Effects o dietarysaturated monounsaturated and n-983091 atty acids on blood pressure inhealthy subjects Am J Clin Nutr 983090983088983088983094983096983091983090983090983089-983094
983089983090983088 Riserus U Fatty acids and insulin sensitivity Curr Opin Clin NutrMetab Care 983090983088983088983096983089983089983089983088983088-983093
983089983090983089 Perez-Jimenez F Lopez-Miranda J Pinillos MD et al A Mediterraneanand a high-carbohydrate diet improve glucose metabolism in healthyyoung persons Diabetologia 983090983088983088983089983092983092983090983088983091983096-983092983091
983089983090983090 Vessby B Uusitupa M Hermansen K et al Substituting dietarysaturated or monounsaturated at impairs insulin sensitivity inhealthy men and women The KANWU Study Diabetologia 983090983088983088983089983092983092983091983089983090-983097
983089983090983091 Tinker LF Bonds DE Margolis KL et al Low-at dietary pattern and risko treated diabetes mellitus in postmenopausal women the WomenrsquosHealth Initiative randomized controlled dietary modification trial Arch
Intern Med 983090983088983088983096983089983094983096983089983093983088983088-983089983089983089983090983092 Pan A Sun Q Bernstein AM Manson JE Willett WC Hu FB Changes inred meat consumption and subsequent risk o type 983090 diabetesmellitus three cohorts o US men and women JAMA Intern Med 983090983088983089983091983089983095983091983089983091983090983096-983091983093
983089983090983093 Micha R Michas G Mozaffarian D Unprocessed red and processedmeats and risk o coronary artery disease and type 983090 diabetesmdashanupdated review o the evidence Curr Atheroscler Rep 983090983088983089983090983089983092983093983089983093-983090983092
983089983090983094 Lee JE McLerran DF Rolland B et al Meat intake and cause-specificmortality a pooled analysis o Asian prospective cohort studies Am JClin Nutr 983090983088983089983091983097983096983089983088983091983090-983092983089
983089983090983095 Forouhi NG Koulman A Sharp SJ et al Differences in the prospectiveassociation between individual plasma phospholipid saturated attyacids and incident type 983090 diabetes the EPIC-InterAct case-cohortstudy Lancet Diabetes Endocrinol 983090983088983089983092983090983096983089983088-983096
983089983090983096 Turcot V Brunet J Daneault C Tardi JC Des Rosiers C Lettre GValidation o atty acid intakes estimated by a ood requencyquestionnaire using erythrocyte atty acid profiling in the MontrealHeart Institute Biobank J Hum Nutr Diet 983090983088983089983092 wwwncbinlmnihgov
pubmed983090983093983090983088983096983094983091983088983089983090983097 Wennberg M Vessby B Johansson I Evaluation o relative intake o
atty acids according to the Northern Sweden FFQ with atty acidlevels in erythrocyte membranes as biomarkers Public Health Nutr 983090983088983088983097983089983090983089983092983095983095-983096983092
983089983091983088 Sluijs I Forouhi NG Beulens JW et al The amount and type o dairyproduct intake and incident type 983090 diabetes results rom theEPIC-InterAct Study Am J Clin Nutr 983090983088983089983090983097983094983091983096983090-983097983088
983089983091983089 OrsquoConnor LM Lentjes MA Luben RN Khaw KT Wareham NJ ForouhiNG Dietary dairy product intake and incident type 983090 diabetes aprospective study using dietary data rom a 983095-day ood diaryDiabetologia 983090983088983089983092983093983095983097983088983097-983089983095
983089983091983090 Hudgins LC Hellerstein M Seidman C Neese R Diakun J Hirsch JHuman atty acid synthesis is stimulated by a eucaloric low at highcarbohydrate diet J Clin Invest 983089983097983097983094983097983095983090983088983096983089-983097983089
983089983091983091 Siler SQ Neese RA Hellerstein MK De novo lipogenesis lipid kineticsand whole-body lipid balances in humans aer acute alcoholconsumption Am J Clin Nutr 983089983097983097983097983095983088983097983090983096-983091983094
983089983091983092 Hodson L Skeaff CM Fielding BA Fatty acid composition o adiposetissue and blood in humans and its use as a biomarker o dietaryintake Prog Lipid Res 983090983088983088983096983092983095983091983092983096-983096983088
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1616
RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
983089983091983094 Willett WC Ascherio A Trans atty acids are the effects only marginal Am J Public Health 983089983097983097983092983096983092983095983090983090-983092
983089983091983095 Danaei G Ding EL Mozaffarian D et al The preventable causes odeath in the United States comparative risk assessment o dietaryliestyle and metabolic risk actors PLoS Med 983090983088983088983097983094e983089983088983088983088983088983093983096
983089983091983096 Chiuve SE Rimm EB Manson JE et al Intake o total trans trans-983089983096983089
and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
983089983093983095 Baylin A Kabagambe EK Ascherio A Spiegelman D Campos H High983089983096983090 trans-atty acids in adipose tissue are associated with increasedrisk o nonatal acute myocardial inarction in costa rican adults J Nutr 983090983088983088983091983089983091983091983089983089983096983094-983097983089
983089983093983096 Block RC Harris WS Reid KJ Spertus JA Omega-983094 and trans atty acidsin blood cell membranes a risk actor or acute coronary syndromes
Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
Adipose tissue trans atty acids and risk o coronary artery disease acase-control study Ann Nutr Metab 983090983088983088983096983093983090983090983092-983096
983089983094983088 Park Y Lim J Lee J Kim S-G Erythrocyte atty acid profiles can predictacute non-atal myocardial inarction Br J Nutr 983090983088983088983097983089983088983090983089983091983093983093-983094983089
983089983094983089 Van de Vijver LP van Poppel G van Houwelingen A Kruyssen DAHornstra G Trans unsaturated atty acids in plasma phospholipidsand coronary heart disease a case-control study Atherosclerosis 983089983097983097983094983089983090983094983089983093983093-983094983089
983089983094983090 Aro A Kardinaal AF Salminen I et al Adipose tissue isomeric transatty acids and risk o myocardial inarction in nine countries theEURAMIC study Lancet 983089983097983097983093983091983092983093983090983095983091-983096
983089983094983091 Micha R King IB Lemaitre RN et al Food sources o individual plasmaphospholipid trans atty acid isomers the Cardiovascular Health
Study Am J Clin Nutr 983090983088983089983088983097983089983096983096983091-983097983091983089983094983092 Allison DB Egan SK Barraj LM Caughman C Inante M Heimbach JTEstimated intakes o trans atty and other atty acids in the USpopulation J Am Diet Assoc 983089983097983097983097983097983097983089983094983094-983095983092983094
983089983094983093 Mozaffarian D Abdollahi M Campos H Houshiarrad A Willett WCConsumption o trans ats and estimated effects on coronary heartdisease in Iran Eur J Clin Nutr 983090983088983088983095983094983089983089983088983088983092-983089983088
983089983094983094 Kemeny ZRK Henon G Kovari K Zwobada F Deodorization ovegetable oils prediction o trans polyunsaturated atty acid content J
Am Oil Chem Soc 983090983088983088983089983095983096983097983095983091-983095983097983089983094983095 Sun Q Ma J Campos H Hu FB Plasma and erythrocyte biomarkers o
dairy at intake and risk o ischemic heart disease Am J Clin Nutr 983090983088983088983095983096983094983097983090983097-983091983095
983089983094983096 Khaw KT Friesen MD Riboli E Luben R Wareham N Plasmaphospholipid atty acid concentration and incident coronary heartdisease in men and women The EPIC-Norolk prospective study PLoSMed 983090983088983089983090983097
983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
older adults the cardiovascular health study Circulation 983090983088983088983094983089983089983092983090983088983097-983089983093
983089983095983088 Hodge AM English DR OrsquoDea K et al Plasma phospholipid anddietary atty acids as predictors o type 983090 diabetes interpreting therole o linoleic acid Am J Clin Nutr 983090983088983088983095983096983094983089983096983097-983097983095
983089983095983089 Kroger J Zietemann V Enzenbach C et al Erythrocyte membranephospholipid atty acids desaturase activity and dietary atty acids inrelation to risk o type 983090 diabetes in the European ProspectiveInvestigation into Cancer and Nutrition (EPIC)-Potsdam Study Am JClin Nutr 983090983088983089983089983097983091983089983090983095-983092983090
983089983095983090 Patel PS Sharp SJ Jansen E et al Fatty acids measured in plasma anderythrocyte-membrane phospholipids and derived by ood-requencyquestionnaire and the risk o new-onset type 983090 diabetes a pilot studyin the European Prospective Investigation into Cancer and Nutrition(EPIC)-Norolk cohort Am J Clin Nutr 983090983088983089983088983097983090983089983090983089983092-983090983090
983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
983089983095983095 Hu FB Are refined carbohydrates worse than saturated at Am J Clin Nutr 983090983088983089983088983097983089983089983093983092983089-983090
983089983095983096 Farvid MS Ding M Pan A et al Dietary linoleic acid and risko coronary heart disease a systematic review and meta-analysis o prospective cohort studies Circulation 983090983088983089983092983089983091983088983089983093983094983096-983095983096
983089983095983097 Ramsden CE Zamora D Leelarthaepin B et al Use o dietary linoleicacid or secondary prevention o coronary heart disease and deathevaluation o recovered data rom the Sydney Diet Heart Study andupdated meta-analysis BMJ 983090983088983089983091983091983092983094e983096983095983088983095
copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions
Appendix 983093 GRADE evidence profile for prospective
cohort studies of saturated fatty acids and health
outcomes
Appendix 983094 GRADE evidence profile for prospective
cohort studies of trans fatty acids and health outcomes
7232019 journal 2 newpdf
httpslidepdfcomreaderfulljournal-2-newpdf 1616
RESEARCH
983089983091983093 Sharma RB Alonso LC Lipotoxicity in the pancreatic beta cell not justsurvival and unction but prolieration as well Curr Diab Rep 983090983088983089983092983089983092983092983097983090
983089983091983094 Willett WC Ascherio A Trans atty acids are the effects only marginal Am J Public Health 983089983097983097983092983096983092983095983090983090-983092
983089983091983095 Danaei G Ding EL Mozaffarian D et al The preventable causes odeath in the United States comparative risk assessment o dietaryliestyle and metabolic risk actors PLoS Med 983090983088983088983097983094e983089983088983088983088983088983093983096
983089983091983096 Chiuve SE Rimm EB Manson JE et al Intake o total trans trans-983089983096983089
and trans-983089983096983090 atty acids and risk o sudden cardiac death in women Am Heart J 983090983088983088983097983089983093983096983095983094983089-983095983089983091983097 Vinikoor LC Millikan RC Satia JA et al trans-Fatty acid consumption
and its association with distal colorectal cancer in the North CarolinaColon Cancer Study II Cancer Causes Control 983090983088983089983088983090983089983089983095983089-983096983088
983089983092983088 Chajes V Thiebaut AC Rotival M et al Association between serumtrans-monounsaturated atty acids and breast cancer risk in theE983091N-EPIC Study Am J Epidemiol 983090983088983088983096983089983094983095983089983091983089983090-983090983088
983089983092983089 Mozaffarian D Katan MB Ascherio A Stamper MJ Willett WC Transatty acids and cardiovascular disease N Engl J Med 983090983088983088983094983091983093983092983089983094983088983089-983089983091
983089983092983090 Abbey M Nestel PJ Plasma cholesteryl ester transer protein activity isincreased when trans-elaidic acid is substituted or cis-oleic acid inthe diet Atherosclerosis 983089983097983097983092983089983088983094983097983097-983089983088983095
983089983092983091 Mensink RP Zock PL Kester ADM Katan MB Effects o dietary attyacids and carbohydrates on the ratio o serum total to HDL cholesteroland on serum lipids and apolipoproteins a meta-analysis o 983094983088controlled trials Am J Clin Nutr 983090983088983088983091983095983095983089983089983092983094-983093983093
983089983092983092 Katan MB Zock PL Mensink RP Trans atty acids and their effects onlipoproteins in humans Annu Rev Nutr 983089983097983097983093983089983093983092983095983091-983097983091
983089983092983093 Mauger JF Lichtenstein AH Ausman LM et al Effect o different ormso dietary hydrogenated ats on LDL particle s ize Am J Clin Nutr 983090983088983088983091983095983096983091983095983088-983093
983089983092983094 Baer DJ Judd JT Clevidence BA Tracy RP Dietary atty acids affectplasma markers o inlammation in healthy men ed controlled dietsa randomized crossover study Am J Clin Nutr 983090983088983088983092983095983097983097983094983097-983095983091
983089983092983095 Libby P Ridker PM Hansson GK Leducq Transatlantic Network onAtherothrombosis Inlammation in atherosclerosis rompathophysiology to practice J Am Coll Cardiol 983090983088983088983097983093983092983090983089983090983097-983091983096
983089983092983096 Mozaffarian D Rimm EB King IB Lawler RL McDonald GB Levy WCTrans atty acids and systemic inlammation in heart ailure Am J ClinNutr 983090983088983088983092983096983088983089983093983090983089-983093
983089983092983097 Wang Q Imamura F Lemaitre RN et al Plasma phospholipidtrans-atty acids levels cardiovascular diseases and total mortalitythe cardiovascular health study J Am Heart Assoc 983090983088983089983092983091piie983088983088983088983097983089983092
983089983093983088 Aronis KN Khan SM Mantzoros CS Effects o trans atty acids onglucose homeostasis a meta-analysis o randomized placebo-
controlled clinical trials Am J Clin Nutr 983090983088983089983090983097983094983089983088983097983091-983097983089983093983089 Dong JY Xun P He K Qin LQ Magnesium intake and risk o type 983090diabetes meta-analysis o prospective cohort studies Diabetes Care 983090983088983089983089983091983092983090983089983089983094-983090983090
983089983093983090 Schulze MB Schulz M Heidemann C Schienkiewitz A Hoffmann KBoeing H Fiber and magnesium intake and incidence o type 983090diabetes a prospective study and meta-analysis Arch Intern Med 983090983088983088983095983089983094983095983097983093983094-983094983093
983089983093983091 Cao H Gerhold K Mayers JR Wiest MM Watkins SM Hotamisligil GSIdentification o a lipokine a lipid hormone linking adipose tissue tosystemic metabolism Cell 983090983088983088983096983089983091983092983097983091983091-983092983092
983089983093983092 Gayet-Boyer C Tenenhaus-Aziza F Prunet C et al Is there a linearrelationship between the dose o ruminant trans-atty acids andcardiovascular risk markers in healthy subjects results rom asystematic review and meta-regression o randomised clinical trialsBr J Nutr 983090983088983089983092983089983089983090983089983097983089983092-983090983090
983089983093983093 Colon-Ramos U Baylin A Campos H The relation between trans attyacid levels and increased risk o myocardial inarction does not holdat lower levels o trans atty acids in the Costa Rican ood supply J
Nutr 983090983088983088983094983089983091983094983090983096983096983095-983097983090983089983093983094 Clion PM Keogh JB Noakes M Trans atty acids in adipose tissue
and the ood supply are associated with myocardial inarction[erratum appears in J Nutr 983090983088983088983092 Jul983089983091983092983089983096983092983096] J Nutr 983090983088983088983092983089983091983092983096983095983092-983097
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Am Heart J 983090983088983088983096983089983093983094983089983089983089983095-983090983091983089983093983097 Ghahremanpour F Firoozrai M Darabi M Zavarei A Mohebbi A
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983089983094983097 Lemaitre RN King IB Mozaffarian D et al Plasma phospholipid transatty acids atal ischemic heart disease and sudden cardiac death in
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983089983095983091 Svensson L Sisontes L Nyborg G Blomstrand R High perormanceliquid chromatography and glass capillary gas chromatography ogeometric and positional isomers o long chain monounsaturated
atty acids Lipids 983089983097983096983089983089983095983093983088-983097983089983095983092 Stamler J Diet-heart a problematic revisit Am J Clin Nutr 983090983088983089983088983097983089983092983097983095-983097983089983095983093 Scarborough P Rayner M van Dis I Norum K Meta-analysis o effect
o saturated at intake on cardiovascular disease overadjustmentobscures true associations Am J Clin Nutr 983090983088983089983088983097983090983092983093983096-983097
983089983095983094 Alhazmi A Stojanovski E McEvoy M Garg ML Macronutrient intakes anddevelopment o type 983090 diabetes a systematic review and meta-analysiso cohort studies J Am Coll Nutr 983090983088983089983090983091983089983090983092983091-983093983096
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copy BMJ Publishing Group Ltd 983090983088983089983093
Appendix 983089 Search strategies and data extractions