"What happens if you give soymilk to women in Texas? Circulating estrogen levels cut in half. Since increased estrogen levels are a “[marker] for high risk for breast cancer,” the effectiveness of soy to reduce estrogen levels may help explain why Chinese and Japanese women have such low rates of breast cancer.
And, what was truly remarkable is that estrogen levels stayed down a month or two, even after they stopped drinking it. This suggests you don’t have to consume soy every day to have the cancer-protective benefit."
How to Block Breast Cancer’s Estrogen-Producing Enzymes | NutritionFacts.org
What happens to hormone levels in women (and men) randomized to drink soy milk?nutritionfacts.org
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