Water Soluble Vitamins Water Soluble Vitamins By Jennifer Turley and Joan Thompson By Jennifer Turley and Joan Thompson © 2013 Cengage © 2013 Cengage
Water Soluble VitaminsWater Soluble Vitamins
By Jennifer Turley and Joan ThompsonBy Jennifer Turley and Joan Thompson
© 2013 Cengage© 2013 Cengage
Presentation Overview
• Explore chemistry, functions, deficiency, adequacy, toxicity, and food sources of the water soluble vitamins: thiamin, riboflavin, niacin, B6, B12, folate, vitamin C, panthothenic acid, biotin, and choline.
Thiamin: B1
Chemistry & Functions
• Enzyme cofactor in energy metabolism: Carbohydrate & BCAA. – B1 functions as the active group of thiamin pyrophosphate (TPP).
• Supports normal appetite & nervous system function.
Thiamin: B1
Deficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <0.8 mg/day
Adequacy DRI: 1.1-1.2 mg/day
RDI: 1.5 mg
Beriberi (wet and dry)Cardio-Vascular: Heart rhythm changesCentral Nervous System: Mental changes, confusion, amnesia, disturbed eye movementGI System: Nausea, anorexiaNeuro-Muscular: Muscle weakness, tingling hands and feetperipheral paralysis, decreased ability to coordinate motor movement, disturbed gaitOther: Edema, exhaustion, weight loss
Normal energy (Glucose & BCAA)
metabolism. Normal appetite and nervous
system functioning.
DRI is based upon 0.5 mg B1 per 1,000
CaloriesAdult DRI values
Toxicity is poorly documented in humans
(UL is Not Established)
Thiamin: B1 Food Sources
• Pork
• Whole grains
• Enriched bread and cereal products
It is added back by law to processed grains
Riboflavin: B2
Chemistry & Functions
• Enzyme cofactor in energy metabolism: fatty acid oxidation. – B2 functions as the active group of two coenzymes flavin
mononucleotide (FMN) and flavin adenine dinucleotide (FAD).
Riboflavin: B2
Deficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <0.85 mg/day
Adequacy DRI: 1.1-1.3 mg/day
RDI: 1.7 mg
AriboflavinosisBone & tooth: Halts growthGI System: Sore and swollen throat, swollen magenta colored tongue, cracking at the corners of the mouthSkin: Dandruff
Normal fatty acid metabolism
Toxicity is poorly documented in humans
(UL is Not Established)
DRI is based upon 0.6 mg B2 per 1,000
CaloriesAdult DRI values
It is added back by law into processed grains
Riboflavin: B2
Food Sources
• Milk products
• Organ meats
• Whole and enriched grains and products such as bread, cereal, and pasta
Niacin: B3
Chemistry & Functions
• Enzyme cofactor in energy metabolism: amino acids, fatty acids, and glucose– A part of nicotinamide adenine dinucleotide (NAD) and nicotinamide
adenine dinucleotide phosphate (NADP).
– Supports steroid synthesis, health of the skin, nervous system, and digestive system.
1 niacin equivalent (NE) = 1 mg nicotinic acid. 60 mg tryptophan can produce 1 NE.
Niacin: B3
Deficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <9-11 mg/day
Adequacy DRI: 14-16 mg/day
RDI: 20 mg
Toxicity (>UL)
>35 mg/day
PellegraCentral Nervous System: Depression, apathy, headache, dementia (including memory loss).GI System: Bright red tongue, diarrhea (GI disturbances of vomiting, diarrhea, and constipation)Skin: DermatitisOther: Fatigue
Normal energy metabolism &
steroid synthesis.
Not from food but rather nicotinic acid supplementsCardio-Vascular: Violent flushing reaction from vasodilationCentral Nervous System: Blurred visionGI System: Nausea, vomiting, liver toxicity
DRI is based upon 6.6 mg B3 per 1,000
Calories
Adult deficient, adequate, toxic values
• Meats, fish, poultry
• Whole & enriched grains & products • Bread, cereal, & pasta• Dairy products & legumes are good sources
of tryptophan
It is added back by law into processed grains
Niacin: B3 Food Sources
Vitamin B6
Chemistry & Functions
• B6 forms (PN, PL, PM, PNP, PLP, PMP) are coenzymes in the metabolism of amino acids, glycogen, and some lipids.
• Interconversion of amino acids (AA) to carbohydrate or carbohydrate to nonessential AA. – Removal of N from AA: “deamination” & "transamination"
• Needed for heme synthesis & conversion of tryptophan to niacin.
Vitamin B6
Deficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <0.85 mg/day
Adequacy DRI: 1.3 mg/day
RDI: 2 mg
Toxicity (>UL)
>100 mg/day
Cardio-Vascular: Microcytic anemiaCentral Nervous System: confusion, depression, epileptic convulsions Skin: Seborrheic (greasy) dermatitis
Normal metabolism of amino acids, glycogen, and
some lipids. Normal heme synthesis &
conversion of tryptophan to
niacin.
Not from food but rather large supplement dosesNeuro-Muscular: Nerve damage, sensory neuropathy, tingly to numb hands and feetSkin: Dermatological lesions
DRI is based upon 0.016 mg of B6 per gm pro consumed Adult deficient, adequate, toxic values
Vitamin B6 Food Sources
• Meats, Fish, Poultry
• Fortified cereals
• Legumes
• Non-starchy vegetables
• Non-citrus fruits
Vitamin B12
Chemistry & Functions
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• Required for nucleic acid, red blood cell & other new cell synthesis.
• Important for nerve cell maintenance.• Cofactor in energy fatty acids & amino
acids metabolism• Conversion of homocysteine to
methionine. • Synergizes with folic acid.
Vitamin B12
Interesting Facts
• Needs intrinsic factor (a protein produced in the stomach) and gastric acid.
• Is absorbed in the ileum.
• If the GI tract is not healthy, B12 must be given by intramuscular injection.
• Nasal spray B12 supplements are available.
• With high dietary intakes, the excess can be stored accumulatively in the liver.
Vitamin B12
Deficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <0.85 µg/day
Adequacy DRI: 2.4 µg/day
RDI: 6 µg/day
Pernicious anemia.
Macrocytic normochromic anemia, compounded with nerve damage.Central Nervous System: Loss of concentration, memory loss, disorientation, dementia, visual disturbancesGI System: Impaired bowel (increased gas production & constipation), sore tongue & loss of appetite Neuro-Muscular: Nerve damage, gait disturbances, tingling & numbness in the hands & feetOther: Insomnia, impotency, reduced bladder control
Normal synthesis of nucleic acids and new cells, nerve cell maintenance, fatty acid and amino acid metabolism, and homocysteine catabolism.
Normal synergy with folate
Adult deficient, adequate values
Toxicity is poorly documented in humans
(UL is Not Established)
Vitamin B12 Food Sources
• Animal food sources: eggs, milk, cheese, meats.
• Since it is commonly found in animal products, vegans need to supplement this nutrient.
Folate, Folic Acid Chemistry & Functions
• Nucleic acid synthesis, new cell synthesis• Cofactor in amino acid metabolism• Conversion of homocysteine to methionine
• Synergizes with B12
FolateDeficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <260 µg/day
Adequacy DRI: 400 µg/dayRDI: 400 µg/day
Cardio-Vascular: Macrocytic normochromic anemia, heart palpitations, shortness of breathCentral Nervous System: Weakness, fatigue, decreased concentration, irritability, headacheGI System: Red tongueHyperhomocysteinemia (heart disease risk)
In utero deficiency can cause Spina Bifida.
Normal nucleic acid synthesis, new cell formation, amino acid metabolism, conversion of homocysteine to methionine, synergy with B12.
Adult deficient, adequate, toxic values
Toxicity is poorly documented in humans
(UL is >1000 µg/day)
• Raw leafy green vegetables & green vegetables
• Legumes, oranges, liver, brewer’s yeast, wheat germ, and some fortified cereals
Folate Food Sources
Vitamin C Chemistry & Functions
• Required for collagen synthesis needed in skin, bones, teeth, blood, epithelial tissue, tendons & ligaments.
• Cofactor for carnitine & neurotransmitter synthesis.
• Water soluble antioxidant• Increases absorption of non-heme
iron
Vitamin CDeficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <50-60 mg/day
Adequacy DRI: 75-90 mg/day
RDI: 60 mg/day
Toxicity (>UL)
>2000 mg/day
ScurvyCentral Nervous System: Weakness, fatigue, depressionGI System: Swollen red bleeding gumsSkin: Follicular hyperkeratosis, petechia, easy bruising, impaired wound healingOther: Joint pain, edema, coiled hairs
Normal collagen synthesis & connective tissue formation.
Normal carnitine, neurotransmitter, and water soluble antioxidant function
GI System: Gastrointestinal disturbances especially diarrheaOther: Increased risk for kidney stones and iron toxicity only in certain people
Adult deficient, adequate, toxic values
Smokers need +35 mg/day
Vitamin C Food Sources
• Citrus fruits, berries, kiwi, and melons • Cabbage family vegetables, peppers, • Vitamin C fortified foods
Pantothenic Acid Chemistry, Functions, & Food Sources
• Essential component in Coenzyme A which is involved in metabolism of fatty acids, cholesterol, steroid hormones, vitamins A and D, neurotransmitters, amino acids, & porphyrin & corrin rings.
Pantothenic AcidDeficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <3.3 mg/day
Adequacy DRI: 5 mg/day
Central Nervous System: Fatigue, apathy, irritability, restlessnessGI System: Nausea, vomiting, abdominal crampsNeuro-Musccular: Muscle cramps, impaired gaitOther: Burning feet, sleep disturbances, hypoglycemia, and increased insulin sensitivity
Normal coenzyme A activity & metabolism of fatty acid, cholesterol, steroid hormones, vitamins A and D, neurotransmitters, amino acids, and porphyrin and corrin rings
Adult deficient, adequate values
Toxicity is poorly documented in humans
(UL is Not Established)
Pantothenic Acid in Foods
Adult DRI: 5 mg/day
Widely distributed in food, highest in high protein animal products, yeast, legumes, and whole grains
Biotin Chemistry, Functions, & Food Sources
• Coenzyme in carboxylation reactions in energy metabolism. • Cell proliferation, gene silencing, & DNA repair. • Widespread in foods, highest in high protein animal
products, yeast, legumes, nuts, whole grains, & chocolate.• Small amounts made by intestinal bacteria.
Quantitative data unavailable for graphical analysis
BiotinDeficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <3.3 mg/day
Adequacy DRI: 30 µg/day
Central Nervous System: Lethargy, depression, hallucinations, weakness, fatigueNeuro-Muscular: Muscle painSkin: Scaly red rash around the eyes, nose and mouthOther: Conjunctivitis, hair loss
Normal energy metabolism, cell
proliferation, gene silencing, and DNA
repair
Adult deficient, adequate, toxic values
Toxicity is poorly documented in humans
(UL is Not Established)
Choline Chemistry & Functions
• Is a component of the neurotransmitter acetylcholine, thus plays a role in memory and muscle control.
• Is in the phospholipid, lecithin (phosphatidlycholine) which is needed to maintain cell membrane stability.
• Needed for lipid and cholesterol transport and metabolism, component of pulmonary surfactant
• Is in bile acids
CholineDeficiency & Toxicity
Deficiency(<66% of DRI)
Approx. <280-360 mg/day
Adequacy DRI: 425-550 mg/day
Toxicity (>UL)
>3,500 mg/day
GI System: Fatty liver and liver damage
Normal acetylcholine, cell membrane stability, bile acids, lipid and cholesterol transport and metabolism, pulmonary surfactant
Cardio-Vascular: HypotensionGI System: Altered liver function, increased salivationOther: Fishy body odor
Adult deficient, adequate, toxic values
Choline Food Sources
• Egg yolk, soy beans, peanuts
• High protein animal products
Quantitative data unavailable for graphical analysis
Summary
• The water soluble vitamins have specific functions.
• DRIs are established for all essential water soluble vitamins.
• Deficiency and toxicity sign and symptoms are established for most of these nutrients.
References for this presentation are the same as those for this topic found in module 5 of the textbook