Breast Cancer

Myth: Breast cancer patients should avoid soyfoods.

Fact: Soyfoods are safe and may possibly even be beneficial for some breast cancer survivors.

Research shows that soyfoods are safe and may possibly even be beneficial for breast cancer survivors and for those at high risk for breast cancer. A study following more than 9,500 women in the U.S. and China who had been diagnosed with breast cancer and found that those who consumed at least 10 milligrams of soy isoflavones per day (the amount in a half cup of soymilk) had a 25% lower chance of breast cancer recurrence than those who consumed less than 4 mg of isoflavones. Both the American Institute of Cancer Research (AICR) and the American Cancer Society (ACS) have concluded that soyfoods are safe for breast cancer patients.

Nechuta SJ, Caan BJ, Chen WY, et al. Soy food intake after diagnosis of breast cancer and survival: an in-depth analysis of combined evidence from cohort studies of US and Chinese women. Am J Clin Nutr 2012;96:123-32

Rock CL, Doyle C, Demark-Wahnefried W, et al. Nutrition and physical activity guidelines for cancer survivors. CA Cancer J Clin 2012;62:242-74