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Anti-obesity effect of two different levels of dehydroepiandrosterone in lean and obese middle-aged female Zucker rats.

Dehydroepiandrosterone has previously been shown to prevent weight gain in growing lean and obese mice and rats. In the present study, lean and obese female Zucker rats were treated with either 0.6 or 1.0 percent DHEA in the diet from 8 until 14 months of age. In lean rats, 0.6 percent DHEA prevented weight gain and 1.0 percent DHEA resulted in significant weight loss compared to initial body weight. Control lean rats had a significant weight gain. Both 0.6 and 1.0 percent DHEA obese rats lost weight over the experimental period while control obese rats gained weight. Food intake of DHEA-treated obese rats was lowered compared to control obese rats but was similar to that of all lean groups. DHEA lowered serum insulin levels in both lean and obese rats relative to control groups. Both 0.6 and 1.0 percent DHEA lean rats had elevated hepatic G6PD activity compared to control lean rats. DHEA obese rats had lowered G6PD activity compared to the control obese rats. Hepatic malic enzyme was elevated by DHEA treatment in both lean and obese Zucker rats. Adipose tissue weights were lowered substantially in DHEA treated lean and obese rats versus their control groups. These data indicate that DHEA treatment in adult rats has an anti-obesity effect.