Short-term treatment with metformin decreases serum leptin concentration without affecting body weight and body fat content in normal-weight healthy men

Metabolism: Clinical and Experimental
Bernd Fruehwald-SchultesAchim Peters

Abstract

A weight-reducing effect of metformin has been demonstrated in obese subjects with and without diabetes. The mechanisms of this action are unclear, which may be partly due to the fact that in obese and diabetic patients the substance's effects result from a complex interaction with the distinct endocrine and metabolic disturbances in these patients. To dissociate primary from secondary action of metformin, we examined effects of the substance in normal-weight healthy subjects. Fifteen normal-weight men were treated with metformin (850 mg twice daily) or placebo for a 15-day period in a double-blind, placebo-controlled, cross-over study. Anthropometric, psychologic, cardiovascular, endocrine, and metabolic parameters were assessed before and at the end of the treatment period. Metformin did not affect body weight (P =.838) and body fat mass (P =.916). Yet, serum leptin concentration was distinctly reduced after metformin (P <.001). Also, metformin reduced the concentration of plasma glucose (P =.011), serum insulin (P=.044), and serum insulin-like growth factor -1 (IGF-1) (P=.013), while it increased serum glucagon concentration (P <.001). There were no effects of metformin on feelings of hunger, blood pressure, heart rate, rest...Continue Reading

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