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     Does Soy offer a protective effect against breast cancer?
Written by Gloria Tsang R.D.
last updated: September 2005

Among all the functional foods, soy products certainly capture consumers' attention. Soy, to be more specific, plant chemicals called isoflavones genistein found in soy, has displayed cancer-fighting activity in lab tests involving cancers of the prostate, breast and colon. Some human studies demonstrated the same encouraging results, but some other clinical trials did not. Among all mentioned cancers, data on soy and prostate cancer seems to be the most promising; many studies support its role in the prevention and possible treatment of prostate cancer.

Soy and Breast Cancer

While some studies showed soy offers a protective effect against breast cancer, a few studies showed the estrogen-like effects in isoflavones may be harmful for women with breast cancer. American Institute for Cancer Research stresses that data on soy and breast cancer are not conclusive, and more work is needed to be done before any dietary recommendations can be made.

What we know at this point is the phytoestrogens in soy foods are "anti-estrogens". In other words, they may block estrogen from reaching the receptors - therefore potentially protecting women from developing breast cancer. Studies found that pre-menopausal may benefit from eating soy foods as their natural estrogen levels are high.

However, this may not be true to post-menopausal women. Studies found that soy could become "pro-estrogen" in women with low levels of natural estrogen. In other words, concentrated soy supplements may add estrogen to the body and hence increase breast cancer risk in post-menopausal women.

Soy and Breast Cancer - the bottom line
Most health professionals agree that a healthy balanced diet that includes soy is certainly a good idea, along with plenty of whole grains and fruits/vegetables. In addition, isolated isoflavone supplements in pills or powder should be used in caution - especially in post-menopausal women
Yes, genetically modified soybean, along with other 42 types of crops are approved by Health Canada for food use in Canada and 44 crops are approved in the States. For safety concerns, check with your local health/food inspection agencies.

With the increasing public concerns regarding genetically modified foods, look for soy products which use non-genetically modified soy crops in their production.

Links:

• Breast Cancer Diet

• Prostate Cancer Diet

• Powerful Benefits of Soy

• Benefits of Soy Milk in Heart Disease

• Soy and Osteoporosis

• Menopause Diet

• Soy and Prostate Cancer

http://www.healthcastle.com/soy-breastcancer.shtml