A review of 15 studies into the influence of soy proteins or isoflavones on male hormones has found no evidence of an estrogen-like effect. Soy has garnered attention as a healthy source of protein, and has been linked to a multitude of health benefits, including protection from breast cancer, prostate cancer, menopausal symptoms and heart disease. But some studies have suggested that soy isoflavones could affect male testosterone levels, due to their similarity in chemical structure to estrogen, which means they bind to estrogen receptors and can exert estrogen-like effects. Another study found a response to 120mg a day of isoflavones from soy flour, in which the researchers reported that serum testosterone decreased by five percent over six weeks. They also noted that for all of the studies, soy protein and isoflavone intake âgreatly exceededâ typical Japanese dietary intake. read more
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