Earlier research in animals had raised fears that soy foods might cause a recurrence of the cancer because soy can act like estrogen. A new study of women finds just the opposite.
Soy foods do not appear to increase the risk of breast cancer recurrence among survivors of the disease and may even confer some health benefits, new research suggests.
The study, published in today’s issue of the Journal of the American Medical Assn., should reassure breast cancer survivors that they need not scrupulously avoid soy foods, which have become increasingly popular in the United States in recent years. Research in animals has indicated that soy might increase the chances of breast cancer recurrence because it can act like the hormone estrogen, which promotes tumor growth.
“Some doctors have advised women not to eat soy foods,” said Dr. Xiao Ou Shu, a professor of medicine at Vanderbilt University and lead author of the paper. “But another school of physicians think it’s safe. So it has been controversial. Our findings are important because, nowadays, it’s very difficult to avoid soy exposure. Soy flour and soy protein has been added to many foods in this country. Women may consume it and not even know it.” Read more »
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