Virtually everyone has heard that soy can increase estrogen levels, which studies have shown to be related to breast and ovarian cancers. A lot of panic about soy and cancer arose from a 1998 study in mice, which showed that soy isoflavones, which act similarly to the hormone estrogen, cause the growth of Existing breast tumors, says Mark Messina, PhD, executive director of the Soy Nutrition Institute. This made experts fear that soy consumption could worsen breast cancer.
However, this has been proven almost absurd. Several other studies have examined the effect of soy consumption on breast cancers and found that consuming soy after diagnosis reduced recurrence and survival, meaning that survivors who consumed soy were less likely to have cancer. 11,224 survivors also showed that eating soy after a diagnosis of breast cancer reduces overall mortality.
Therefore, the American Cancer Society and the American Institute for Cancer Research claim that breast cancer patients can consume soy safely.
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