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Soy contains phytoestrogens in extremely small amounts. But so does chicken, which contains actual estrogen. In both cases it's so small you would have to consume an extremely large amount over a long period of time for it to even be a factor.
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Yea, just don’t go drinking 1.2L of soy milk a day.
I think the best argument against a vegan diet though is that most people do it without education or planning and encounter nutritional gaps. B12, iron, protein, etc.
Secondary Hypogonadism due to Excessive Ingestion of Isoflavone in a Man - PMC
A 54-year-old man had been drinking approximately 1.2 L of soy milk (equivalent to approximately 310 mg of isoflavones) per day for the previous 3 ...