Differences in corticotropin-releasing hormone-stimulated adrenocorticotropin and cortisol before and after weight loss

The Journal of Clinical Endocrinology and Metabolism
J A YanovskiG P Chrousos

Abstract

Little is known about the effects of intentional weight loss on the function of the hypothalamic-pituitary-adrenal (HPA) axis of obese individuals. We studied the HPA axis of 34 healthy obese women (body mass index, 40.2 +/- 7.9 kg/m2) before and after a 21.0 +/- 7.9-kg weight loss induced by a 26-week weight loss program that included 12 weeks of a 3350 kJ/day (800 Cal/day) liquid formula diet, 6 weeks of gradual refeeding, and 6 weeks of caloric stabilization at 5020-6280 kJ/day (1200-1500 Cal/day). Obese subjects were evaluated twice: before caloric restriction and during the last 3 weeks of caloric stabilization with a 3-h evening 1 microg/kg ovine CRH (oCRH) stimulation test. CRH-stimulated ACTH and cortisol values were compared to those of a control group of 12 normal weight women. Before caloric restriction, both ACTH and cortisol responses to oCRH were similar in obese women and normal weight controls. Weight loss did not significantly alter the ACTH response to oCRH; however, the total plasma cortisol response to oCRH decreased significantly with weight loss (area under the curve, 96,320 +/- 21,040 nmol/L x min before weight loss; 82,450 +/- 22,460 nmol/L x min after weight loss; P < 0.001). Cortisol-binding globulin a...Continue Reading

Citations

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