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Frequently Asked Soyfood Questions

 

Soy/Health

11. I read an article that eating soy can cause breast cancer. Is this true?

A number of studies suggest that soy isoflavones, specifically genistein and daidzein, may help reduce cancer risk. Researchers have proposed that soy has various mechanisms that inhibit the development and growth of cancerous tumors. One study involving 12,395 California Seventh-day Adventist men indicated that frequent consumption (more than once a day) of soymilk was associated with a 70 percent reduction in the risk of prostate cancer. Research on soy and the prevention of colon cancer has also produced encouraging results.

Some studies have raised concerns about the effect of soy isoflavones on estrogen-positive breast cancer. While these studies indicate a need for further research, there is strong evidence to suggest that soy is also beneficial in preventing breast cancer. The one study that is most often cited to illustrate possible adverse effects is a two-week study by McMichael-Phillips et al who found that soy isoflavones stimulated cell proliferation in breast cells taken from biopsies of premenopausal women with benign and malignant breast disease. In a recent follow-up analysis that included all subjects in the McMichael-Phillips study, Hargreaves et al found absolutely no effects on cell proliferation. While the research seems to be producing mixed results, there is reason to believe that studies currently underway will show that soy is safe for women in any situation.

For more information on soy/health check out Stratsoy's Soy/Health area.