Many male bodybuilders avoid soy protein. Soy protein has been lauded as the only complete plant protein. Many male bodybuilders do not use soy protein because of rumors that it decreases testosterone and consequently inhibits muscle gains.
However, a study in the July 2007 Journal of he International Society of Sports Nutrition shows that soy protein does not decrease testosterone and, in fact, leads to significant increases in lean mass when combined with resistance training. Results of the study showed no differences in sex-hormone levels, percentage of body fat, body-mass index or body weight among men taking 50 grams per day of soy concentrate, soy isolate, soy isolate plus whey, or whey only.
My recommendation is that male bodybuilders should use some soy protein for protein variety.
GREGORY CHANDLER, Attorney at Law
e-mail attatlawgc@gmail.com
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