I have heard that soy products actually increase one's risk of breast cancer. The isoflavones in soy, which normally are very beneficial, are phytoestrogens. The rationale is that if these estrogen-like plant substances made the estrogen-sensitive tumors think it was true estrogen, it could stimulate tumor growth.Pass the soymilk!
Messina MJ, Wood CE. Soy isoflavones, estogen therapy, and breast cancer risk: analysis and commentary. Nutr J. June 3, 2008;7:17.
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