Summary: Soy may have beneficial uses like boosting estrogen levels in menopausal women (and in men to inhibit testosterone), providing antioxidants, and lowering thyroid output for those who have the unusual problem of excess thyroid production, but for others, it may not be wise to eat large amounts daily.
Soy is controversial. Some say it is a healthy source of protein, nutrients, and fiber. Others think it can cause problems like hormonal imbalance, low thyroid output, and allergies, not even considering the new worry some have about how common genetically modified soy now is.
Several articles about both sides of the soy issue: http://www.electroherbalism.com/Naturopathy/Therapies/Diet/Soy/index.htm.
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