What is Obesity? Obesity means excess accumulation of fat in the body Once it develops it is difficult to ‘cure’ and usually persists throughout life Obesity is usually diagnosed on the basis of calculation of Body mass index Measurement of waist-hip ratio
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What is Obesity?
Obesity means excess accumulation of fat in the body
Once it develops it is difficult to ‘cure’ and usually persists throughout life
Obesity is usually diagnosed on the basis of calculation of
Body mass index Measurement of waist-hip ratio
Classification of Overweight and Obese by Body Mass Index
BMI (kg/m2)
WHO guidelines Proposed Asia Pacific guidelines Underweight < 18.5 < 18.5
Normal 18.5-24.9 18.5-22.9
Overweight 25.0-29.9 > 23
At risk - 23-24.9
Obesity 30-34.9 (Class I) 25-29.9 (Class I)
35-39.9 (Class II) > 30 (Class II)
Extremely Obese > 40 (Class III) -
BMI = Weight (kg) [Height (m)]2
Waist-to-hip ratio
Ratio = WAIST
HIPS
TO FIND RATIOWaist: Measure atnarrowest point withstomach relaxed
Hips: Measure atfullest point
Desired RatioWomen : <0.8Men : < 1.0
Risk increases if waist circumference is >94 cm in men and >80 cm in women
Co-morbidities risk associated with different levels of BMI and suggested waist circumference in adult Asians
Classification BMI Risk of co-morbidities
Waist circumference
< 90 cm (men) > 90 cm (men)
< 80 cm (women) > 90 cm (women)
Underweight < 18.5 Low Average
Normal range 18.5-22.9 Average Increased
Overweight > 23
At risk 23-24.9 Increased Moderate
Obese I 25-29.9 Moderate Severe
Obese II > 30 Severe Very severe
Obesity – An imbalance in energy intake and energy expenditure
Proteins (20%) BMR (60-65%)
ENERGY INTAKE ENERGY EXPENDITURE
Carbohydrates (55%) Physical activity (25-30%)
Fats (25%) Thermic effectof food (10%)
Classification of obesity as per fat distribution
Android (or abdominal or central, males)-Collection of fat mostly in the abdomen (above the waist)
-apple-shaped
-Associated with insulin resistance and heart disease
Gynoid (below the waist, females)
• Collection of fat on hips and buttocks
•pear-shaped
-Associated with mechanical problems
Diseases and conditions forwhich obesity is a risk factor
Weight loss of 0.5-9 kg (n=43,457) associated with 53% reduction in cancer-deaths, 44% reduction in diabetes-associated mortality and 20% reduction in total mortality
Survival increased 3-4 months for every kilogram of weight loss
Reduced hyperlipidemia, hypertension and insulin resistance
Improvement in severity of diseases Person feels ‘fit’ and mentally more active
Treatment goals
Prevention of further weight gain
Weight loss to achieve a realistic, target BMI
Long-term maintenance of a lower body-weight
How much weight loss is significant?
A 5-10% reduction in weight (within 6 months) and
weight maintenance should be stressed in any weight
STORM Study : Effect of sibutramine on weight loss
98
104102100
96949290
0 12 22 2420181614108642
Placebo
Sibutramine
Month
Weight loss Weight maintenance
Bod
ywei
ght (
kg)
Lancet 2000; 356:2119-2125
STORM Study:Effect on Waist Circumference and Waist/Hip Ratio
-9.2
-4.5
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Sibutramine Placebo
Dec
rea
se in
wai
stci
rcum
fere
nce
(cm
)
-1.2
0.8
-1.5
-1
-0.5
0
0.5
1
Sibutramine Placebo
Cha
nge
(a) Waist Circumference (b) Waist/Hip Ratio
STORM Study : Effects on lipids
50
-5-10-15-20-25
Placebo
Sibutramine
Triglycerides
% c
han
ge
00 2418126
50
-5-10-15-20-25
Placebo
Sibutramine
VLDL cholesterol
180 24126
% c
han
ge
Lancet 2000; 356:2119-2125
STORM Study : Effects on lipids (Contd.)
180 24126
25
20
15
10
5
0
HDL cholesterol
% c
ha
ng
e Sibutramine
Placebo
Month of assessment
Weight loss
Weight maintenance
Lancet 2000; 356:2119-2125
30
STORM study: Conclusions
Almost all patients who persist with a weight management program consisting of sibutramine, diet and exercse can achieve at least a 5% weight loss with sibutramine
Over half can lose more than 10% weight within 6 months
Weight loss was sustained in most patients continuing therapy for two years
Sibutramine vs. Dexfenfluramine
-3.2
-4.5-5-4.5
-4-3.5
-3-2.5
-2-1.5
-1-0.5
0
We
igh
t los
s (k
g)
Sibutramine 10 mg Dexfenfluramine 30 mg
n=226; 12 wks
Int J Obes 1995; 19. Suppl 2: 144
Adverse effects occurring in >5% of patients treated with Sibutramine compared with placebo