Does dairy cause man boobs? It’s one of the most persistent myths you’ll encounter: soy elevates estrogen levels and suppresses testosterone. But is it true?

Fortunately, there is no evidence to back up the persistent myth that soy causes “man boobs” (gynecomastia) or any other negative hormonal effects.

The most comprehensive source of information on soys’ health effects in the long term comes from studies on soy infant formula. Soy milk is often used in children who are allergic to cow’s milk formula or are intolerant to lactose. In 2004, a study of 48 children raised on soy formula showed exactly zero cases of precocious puberty, breast growth or other problems associated with sex hormones. A comprehensive study published in the journal Fertil Steril showed that soy did not have feminizing effects, even when soy was consumed at levels much higher than those of asian men. This has been the case in repeated studies.

So we have proven that phytoestrogens do not cause an increase in human estrogen levels, nor do they reduce testosterone. And yet paranoia keeps many men from consuming soy out of a false belief that it might “feminize” them. This could not be farther from the truth.

On the other hand, soy can actually help with a number of health issues that threaten public health. Soy has been linked to reduced risk of coronary heart disease and cancer. In fact, some studies go so far as to encourage plentiful soy consumption early in life, since it’s been shown to reduce the risks of so many diseases.

For links to the research studies mentioned in this video, please visit my blog https://ModVegan.com/soy

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