“A study of ninety-nine men attending a fertility clinic found that those subjects who had the highest soy intake also had the lowest sperm counts compared to men who ate no soy foods.”
“In another study, researchers compared the effect of two scoops of pure soy protein powder (56g/day) on the testosterone levels of twelve healthy young men. After four weeks of using the soy protein powder, the average testosterone levels of the subjects had decreased by nineteen percent. Once the men stopped taking the soy supplement, their testosterone levels returned to normal after about two weeks (Arbor Clinical Nutrition Update, 2009; “Can Phytoestrogens Cause Infertility?”).”
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