Testosterone is a steroid hormone secreted from the Leydig cells of the testes that has both anabolic and anticatabolic effects upon muscle tissue. Dietary nutrients, in particular fat, have been shown to affect testosterone. Individuals consuming a diet containing about 20% fat compared with a diet containing 40% fat have significantly lower concentrations of testosterone. Also, replacing dietary carbohydrate with protein has been shown to decrease testosterone concentrations.
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