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Soy Not Such A Wonder For Health?

Latest research findings challenge the efficacy of soya in maintaining health.

Although daily consumption of soy protein found in tofu and other soybean products may result in a small reduction in LDL. //In addition, isoflavones found in soy may reduce the frequency of hot flashes in post-menopausal women. However, the available studies on the health impacts of soy were limited in number, of poor quality, or their duration was too short to lead to definite conclusions.

Overall, across the 68 studies that examined the impact of soy on cholesterol levels, consumption of soy products resulted in a 5 mg/dL (about 3 percent) reduction in LDL and an 8 mg/dL (about 6 percent) decrease in triglyceride levels in the populations studied. Among these studies, a large variety of soy products, doses of soy protein, and doses of soy isoflavones were tested. The average dose of soy protein in the studies was equivalent to about one pound of tofu or three soy shakes daily.

Among 21 studies evaluating the consumption of soy isoflavones for menopause-related symptoms, there was a net reduction in hot flash frequency ranging from 7 percent to 40 percent, however, these trials were mostly rated as poor quality. Among studies with statistically significant improvements in symptoms, the dose of soy isoflavones ranged from 17.5 to 100 mg/day.

The evidence review completed by AHRQ’s Tufts-New England Medical Centre Evidence-based Practice Centre also found insufficient data among the 200 human studies examined as part of this analysis to suggest that soy had an effect on bone health, cancer, kidney disease, endocrine function, reproductive health, neurocognitive function, or glucose metabolism. A wide variety of soy products were studied, including foods such as soybeans, soy flour, soy milk, tofu, miso, tempeh, natto, and okara; isolated and textured soy protein that is added to foods; and soy-derived isoflavone supplements. Aside from min or gastrointestinal problems reported in some short-term studies, consumption of soy products by study participants was not associated with adverse events. However, long-term safety data are lacking.

“This report shows us that there is a lot we don’t know about soy, and that more research is needed to determine if soy has any impact on a number of health conditions,” said AHRQ Director Carolyn M. Clancy, M.D. “An important role for AHRQ’s Evidence-based Practice Centres is to identify gaps in evidence and knowledge that can be used to develop future research agendas.”

Source: Tufts New England Medical Cntre
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