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Questions for Dr. Kennedy
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Soy Protein
Posted by: Davey
Date: May 3, 2001 6:39 PM

As I read your book, you see soy as an excellent protein source. However, I also believe I have read somewhere that soy can damage thyroid functions. Would appreciate your thoughts.

RE: Soy Protein
Posted by: Ron Kennedy, M.D.
Date: May 4, 2001 10:21 AM

Soy is thought to decrease cholesterol. Feeding soy protein to laboratory animals consistently elevates plasma thyroxine concentrations. This elevation in plasma thyroxine precedes the change in plasma cholesterol concentrations and is thought to be the mechanism behind lowering cholesterol. This may account for the protection soy apparently gives against vascular disease. I don't know a mechanism for the protection shown against cancer by epidemiological studies. As far as doing damage, I have never seen it in my practice, but I suppose anything in excess unbalances the system, even water.

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