2 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.