Because estrogen can promote the development, growth, and spread of breast cancers, doctors have worried that eating a lot of soy foods or soy isoflavones (which can be taken as a dietary supplement) might worsen the prognosis of women diagnosed with breast cancer.
Examples of a single serving include: 1 cup of soy milk, 1/2 cup cooked soy beans, 1/2 cup of edamame, 1 ounce of soy nuts, or 1/3 cup of tofu. Soy and breast cancer. Because natural soy foods contain isoflavones, similar to estrogen, some people fear that soy may raise their risk for certain cancers.
This means observational studies can't conclusively prove that soy protects against breast cancer. However, these studies are reassuring in affirming that soy foods do not increase breast cancer risk. They point toward a protective effect of soy on breast health, regardless of other lifestyle and diet choices. Food First.
Jan 22, · Medically reviewed by Wendy Y. Chen, MD, MPH Is there a link between soy and an increased risk of breast cancer? “That’s one of the most common questions I get from breast cancer survivors,” says Wendy Chen, MD, MPH, a breast oncologist with the Susan F. Smith Center for Women’s Cancers at Dana-Farber. While laboratory Continued.