soy - Cook for Your Life

Soy & Breast Cancer

by CFYL Staff on August 26, 2015


Is it safe for me to eat soy? I am a breast cancer survivor and it seems like the information is so conflicting. 

The controversy over soy and breast cancer has been ongoing for some years. But recently published studies hopefully have resolved this issue.

Early investigations targeted soy as a possible risk factor because it contains a group of proteins, called isoflavones, that mimic estrogen. Higher levels of estrogen are associated with increased risk of breast cancer. Animal studies showed that mice fed isoflavones in fact, did have an increased risk of breast cancer. Even though mice metabolize isoflavones differently than humans, healthcare providers erred on the side of caution and advised breast cancer patients against any consumption of soy.

In the past few years, results of human studies have finally been published. They looked at women in the United States as well as Asia, where soy is consumed more regularly. These large population studies show that soy products may even be protective in certain circumstances but at least they are not harmful. These results are true even for women taking tamoxifen or aromatase inhibitors, two medications for estrogen receptor + breast cancer.

Soy products consumed in the early years of puberty may be the most protective. Consuming soy later in life appears neutral.  However, there is some evidence that soy, aside from its isoflavone content, may have anti-cancer properties.  It may protect cells from damage (anti-oxidants), reduce inflammation, discourage tumor cell proliferation and increase destruction of tumor cells.

Bottom line:  These recent studies should put to rest the controversy over soy and breast cancer risk.  Women with breast cancer, even if estrogen-receptor positive, or women at risk for breast cancer can enjoy soy foods as a part of a balanced diet.  Bonus point:  As a substitute for high-fat meat and dairy products, soy has health benefits for both the heart and the waistline!

The most commonly eaten soy foods are tofu, tempeh, soy milk, edamame, soy nuts, miso, soy cheese and soy yogurt.

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