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2003 MAY 1 - (NewsRx.com & NewsRx.net) -- by J.B. Henderson, MS, senior science editor - Soy products, a common component in the oriental diet, provide nutritionally valuable folate, vitamin B[subscript]6, and minerals. They also are a source of plant estrogens (phytoestrogens), which has raised questions about their effects in both pre- and postmenopausal women.
Now results of a study from Japan indicate that in premenopausal women, soy intake benefits homocysteine metabolism. The research was described in the Journal of Nutrition.
Questions regarding dietary soy and serum homocysteine levels prompted the study by C. Nagata and colleagues, in which they "examined a cross-sectional relationship between soy product intake and serum homocysteine level in 201 premenopausal Japanese women."
They explained that "isoflavones ... are weak estrogens contained in soybeans ... [and] may exert antiestrogenic effects in a high estrogen environment, such as in premenopausal women."
Each woman completed a semiquantitative food frequency survey from which the researchers then estimated soy product, folate, methionine, and vitamin B[subscript]6 and vitamin B[subscript]12 intake. Serum folate measurements provided additional data on the women's folate status (Soy product intake is ...