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Another Reason to Order Tofu Burgers

Study: Soy-rich diet lowers estrogens linked to breast cancer

TUESDAY, Oct. 1, 2002 (HealthDayNews) -- Tofu and other soy-based foods greatly reduce levels of a class of estrogens linked with breast cancer in post-menopausal women.

So says a study in the September issue of Cancer Epidemiology, Biomarkers and Prevention.

"Results from this study support the hypothesis that high soy intake may reduce the risk of breast cancer by lowering endogenous estrogen levels, particularly estrone," says lead investigator Anna. H. Wu, a professor of preventive medicine at the Keck School of Medicine, University of Southern California, Los Angeles.

In their study of 144 post-menopausal Asian women, aged 50-74, in Singapore, Wu and her colleagues found a link between soy-rich diets and lower levels of estrone, the predominant type of estrogen in women following menopause.

Estrone levels in women who consumed the most soy protein were about 15 percent lower than other women. The researchers could not find any other easily changeable lifestyle factor that could produce that much of an estrone reduction.

It's been shown that high estrogen levels increase the risk of breast cancer among post-menopausal women.

More information

The U.S. Food and Drug Administration has a discussion on soy.

SOURCE: American Association for Cancer Research, news release, September 2002
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