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The effects of metformin and diet on plasma testosterone and leptin levels in obese men.
Obes Res. 2001 Nov; 9(11):662-7.OR

Abstract

OBJECTIVE

The aim of this study was to investigate the effects of combined hypocaloric diet and metformin on circulating testosterone and leptin levels in obese men with or without type 2 diabetes.

RESEARCH METHODS AND PROCEDURES

Twenty obese men with type 2 diabetes (mean body mass index [BMI]: 35.5 +/- 1.1 kg/m(2)) and 20 nondiabetic obese men were enrolled in the study. We measured serum follicle-stimulating hormone, luteinizing hormone (LH), total testosterone (TT), free testosterone (FT), sex-hormone-binding globulin (SHBG), dehydroepiandrosterone sulfate (DHEAS), and plasma leptin levels before and 3 months after metformin treatment. Both groups were placed on a hypocaloric diet and 850 mg of metformin taken orally twice daily for 3 months.

RESULTS

Metformin and hypocaloric diets led to decreases in BMI and waist and hip circumferences in both groups. A significant decrease in TT levels in the diabetic group and FT levels in the control group was found, whereas follicle-stimulating hormone, LH, and DHEAS levels were not changed significantly. A significant increase in SHBG levels was observed in the control group but not in the patient group. Leptin levels also decreased after treatment in both groups. Decreased testosterone levels were not correlated to changes in waist and hip circumference, waist-to-hip ratio, BMI, and levels of fasting blood glucose, leptin, SHBG, or DHEAS in the diabetic group. However, a decrease in FT was correlated to changes in the levels of SHBG (r = -0.71, p = 0.001) and LH (r = 0.80, p = 0.001) but not to other parameters.

DISCUSSION

We conclude that metformin treatment combined with a hypocaloric diet leads to reduced FT levels in obese nondiabetic men and to reduced TT levels in obese men with type 2 diabetes. Increased SHBG levels may account for the decrease in FT levels in the former group.

Authors+Show Affiliations

Ozata M
Department of Endocrinology and Metabolism, Gulhane School of Medicine, Etlik-Ankara, Turkey. mozata@obs.gata.edu.tr
Oktenli C
No affiliation info available
Bingol N
No affiliation info available
Ozdemir IC
No affiliation info available

MeSH

AdultBody ConstitutionBody Mass IndexDehydroepiandrosterone SulfateDiabetes MellitusDiabetes Mellitus, Type 2Diet, ReducingEnergy IntakeFemaleFollicle Stimulating HormoneHumansHypoglycemic AgentsLeptinLuteinizing HormoneMaleMetforminMiddle AgedObesitySex Hormone-Binding GlobulinTestosterone

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11707532

Citation

Ozata, M, et al. "The Effects of Metformin and Diet On Plasma Testosterone and Leptin Levels in Obese Men." Obesity Research, vol. 9, no. 11, 2001, pp. 662-7.
Ozata M, Oktenli C, Bingol N, et al. The effects of metformin and diet on plasma testosterone and leptin levels in obese men. Obes Res. 2001;9(11):662-7.
Ozata, M., Oktenli, C., Bingol, N., & Ozdemir, I. C. (2001). The effects of metformin and diet on plasma testosterone and leptin levels in obese men. Obesity Research, 9(11), 662-7.
Ozata M, et al. The Effects of Metformin and Diet On Plasma Testosterone and Leptin Levels in Obese Men. Obes Res. 2001;9(11):662-7. PubMed PMID: 11707532.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of metformin and diet on plasma testosterone and leptin levels in obese men. AU - Ozata,M, AU - Oktenli,C, AU - Bingol,N, AU - Ozdemir,I C, PY - 2001/11/15/pubmed PY - 2002/1/12/medline PY - 2001/11/15/entrez SP - 662 EP - 7 JF - Obesity research JO - Obes Res VL - 9 IS - 11 N2 - OBJECTIVE: The aim of this study was to investigate the effects of combined hypocaloric diet and metformin on circulating testosterone and leptin levels in obese men with or without type 2 diabetes. RESEARCH METHODS AND PROCEDURES: Twenty obese men with type 2 diabetes (mean body mass index [BMI]: 35.5 +/- 1.1 kg/m(2)) and 20 nondiabetic obese men were enrolled in the study. We measured serum follicle-stimulating hormone, luteinizing hormone (LH), total testosterone (TT), free testosterone (FT), sex-hormone-binding globulin (SHBG), dehydroepiandrosterone sulfate (DHEAS), and plasma leptin levels before and 3 months after metformin treatment. Both groups were placed on a hypocaloric diet and 850 mg of metformin taken orally twice daily for 3 months. RESULTS: Metformin and hypocaloric diets led to decreases in BMI and waist and hip circumferences in both groups. A significant decrease in TT levels in the diabetic group and FT levels in the control group was found, whereas follicle-stimulating hormone, LH, and DHEAS levels were not changed significantly. A significant increase in SHBG levels was observed in the control group but not in the patient group. Leptin levels also decreased after treatment in both groups. Decreased testosterone levels were not correlated to changes in waist and hip circumference, waist-to-hip ratio, BMI, and levels of fasting blood glucose, leptin, SHBG, or DHEAS in the diabetic group. However, a decrease in FT was correlated to changes in the levels of SHBG (r = -0.71, p = 0.001) and LH (r = 0.80, p = 0.001) but not to other parameters. DISCUSSION: We conclude that metformin treatment combined with a hypocaloric diet leads to reduced FT levels in obese nondiabetic men and to reduced TT levels in obese men with type 2 diabetes. Increased SHBG levels may account for the decrease in FT levels in the former group. SN - 1071-7323 UR - https://www.unboundmedicine.com/medline/citation/11707532/The_effects_of_metformin_and_diet_on_plasma_testosterone_and_leptin_levels_in_obese_men_ L2 - https://doi.org/10.1038/oby.2001.90 DB - PRIME DP - Unbound Medicine ER -