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Journal of Clinical Endocrinology & Metabolism, Vol 81, 4406-4413, Copyright © 1996 by Endocrine Society
ARTICLES |
PJ Havel, S Kasim-Karakas, W Mueller, PR Johnson, RL Gingerich and JS Stern
Department of Nutrition, School of Medicine, University of California, Davis 95616, USA.
Leptin, the product of the human homologue of the ob gene, which is defective in the obese (ob/ob) mouse, may be a humoral regulator of human adiposity. Plasma leptin concentrations were measured by RIA in 19 normal weight [body mass index (BMI) = 24.5 +/- 0.6 kg/m2] and 19 overweight to obese (BMI = 34.7 +/- 1.2 kg/m2) nondiabetic postmenopausal women on sequential controlled weight-maintaining diets containing 31%, 23%, and 14% of energy as fat, each for 4-6 weeks. Thereafter, the subjects ate a very low fat diet (< 15%) ad libitum; plasma leptin and insulin concentrations, BMI, percent body fat (%BF), and resting energy expenditure were determined after 6 and 8 months. Absolute and adiposity-corrected plasma leptin levels were higher in overweight/obese women (37.7 +/- 3.5 ng/mL; 1.01 +/- 0.07 ng.mL-1.%BF- 1) than in normal weight women (16.9 +/- 2.2 ng/mL; 0.57 +/- 0.06 ng.mL- 1.%BF-1, both P < 0.005 vs. obese), but were not different between the 31%, 23%, and 14% fat diets when body weight was stable. Plasma leptin was highly correlated with BMI (r = 0.81, P < 0.0001), %BF (r = 0.80, P < 0.0001), and fasting plasma insulin (r = 0.61, P < 0.0001). After 8 months on the ad libitum low fat diet, the women had lost an average of 6.9 +/- 1.0% of body mass (-2.0 +/- 0.3 kg/m2, P < 0.0001). In 15 subjects who lost more than 7% of body mass (-12.3 +/- 1.0%), plasma leptin concentrations decreased (-9.6 +/- 1.9 ng/mL, P < 0.0005), and the decrease of plasma leptin per change of adiposity (delta leptin/delta %BF) was greater in overweight/obese women (3.6 +/- 0.5) than in normal weight women (0.9 +/- 0.4, P < 0.01 vs. obese). In 18 other subjects who lost less than 7% of body mass (-2.7 +/- 0.6%), plasma leptin was unchanged (+1.4 +/- 1.4 ng/mL). Overall, the change of plasma leptin was significantly correlated with change of BMI (r = 0.43, P < 0.02), the change of %BF (r = 0.49, P < 0.005), the change of resting energy expenditure (r = 0.40, P < 0.02), and with the change of plasma insulin independently of changes of body adiposity (r = 0.45, P < 0.01). We conclude that plasma leptin concentrations are: 1) not affected by dietary fat content per se; 2) highly correlated with BMI, %BF, and plasma insulin in both overweight/obese and normal weight women; 3) decreased in parallel with plasma insulin after sustained weight loss; and 4) decreased more in overweight/obese than in normal weight women.
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