What kind of cancer does soy cause? In some animal studies, rodents that were exposed to high doses of compounds found in soy called isoflavones showed an increased risk of breast cancer. This is thought to be because the isoflavones in soy can act like estrogen in the body, and increased estrogen has been linked to certain types of breast cancer.
Does soy really increase estrogen? Hormone levels.
Premenopausal women have much higher circulating levels of estradiol—the major form of estrogen in the human body—than postmenopausal women. In this context soy may act like an anti-estrogen, but among postmenopausal women soy may act more like an estrogen.
What does soy do to a woman’s body? Soy consumption has been suggested to exert potentially cancer-preventive effects in premenopausal women, such as increased menstrual cycle length and sex hormone-binding globulin levels and decreased estrogen levels.
Can you eat soy after breast cancer? As a survivor, is soy safe? Though the estrogen-like properties of soy seem like they could increase the risk of breast cancer recurrence or mortality (death), current studies suggest that eating moderate amounts of soy foods is safe for breast cancer survivors.