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Many nutritionists recommended soy for reducing exposure to cancer-linked hormones--but they always cautioned women of childbearing age against a potential, soy-related reduction in fertility. That may change, however, as new research concludes that soy is unlikely to impede fertility in women.
Women in Asian countries--where a lot of soy is consumed--have dramatically lower rates of breast cancer compared to women in North America and Europe. Isoflavones, the plant estrogens found in soy, are thought to play a role in this lower incidence, either by increasing menstrual cycle length or reducing ovarian hormones--both of which would reduce lifetime exposure to estrogen. However, these changes in the menstrual cycle could theoretically ...