Soy seems to protect against breast cancer - at least if you eat it when you're young. A new study from the National Cancer Institute (NCI) found that Asian-American women who ate the highest amounts of soy when they were children had a 58 percent reduced risk of developing breast cancer as adults. Women who consumed a lot of soy during adolescence or adulthood also had some protection - 20 to 25 percent lower than normal. In general, breast cancer rates among women in the U.S. have been four to seven times higher than those of women in China or Japan, but once Asian women emigrate to the U.S. their risk begins to increase, perhaps because of dietary changes. The researchers aren’t sure why soy is beneficial but speculated that the estrogen-like isoflavones it contains may affect young breast tissue in a protective way. The study was published online on March 24, 2009 in Cancer Epidemiology Biomarkers and Prevention.
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