Why is soy bad for testosterone?
Soy foods are also high in phytoestrogens, which are plant-based substances that mimic the effects of estrogen in your body by altering hormone levels and potentially reducing testosterone ( 4 ).
Does soy cause erectile dysfunction?
However, studies, including Messina’s cited above, find soy has no effect on testosterone levels and doesn’t cause erectile dysfunction.
How does soy affect male hormones?
Concerns that the phytoestrogens (isoflavones) in soy may feminize men continue to be raised. Several studies and case-reports describing feminizing effects including lowering testosterone levels and raising estrogen levels in men have been published.
Does soy reduce sperm count?
Soy products contain phytoestrogens—estrogen-like compounds that come from plants. A study of 99 men from fertility clinics in Boston concluded that excessive soy intake might decrease sperm concentration.
Why is soy bad?
Soy, it turned out, contains estrogen-like compounds called isoflavones. And some findings suggested that these compounds could promote the growth of some cancer cells, impair female fertility and mess with thyroid function.