Highly purified soy foods and soy supplements marketed in the United States may stimulate the growth of pre-existing estrogen-dependent breast tumors, according to a study done at the University of Illinois at Urbana-Champaign.
"Soy has been correlated with low rates of breast cancer in Asian populations, but soy foods in Asia are made from minimally processed soybeans or defatted, toasted soy flour, which is quite different from soy products consumed in the U.S.," said William G. Helferich, a professor of food science and human nutrition, in a study presented online May 6 in advance of regular publication by the journal Carcinogenesis.
"Isoflavone-containing products consumed in the U.S. may have lost many of the biologically active components in soy, and these partially purified isoflavone-containing products may not have the same health benefits as whole soy foods," he said.
Phyllis Picklesimer | EurekAlert!
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