Endogenous Sex Hormones and Metabolic Syndrome in Aging Men. Higher levels of testosterone and higher levels of sex hormone binding globulin (SHBG) are independently associated with improved insulin sensitivity and a reduced risk of the metabolic syndrome/early diabetes. These hormones may protect against the development of metabolic syndrome.
Muller, M. et al. 2004. The Journal of Clinical Endocrinoology and Metabolism. 90(5):2618-2623.