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In the most comprehensive study to date to examine the effects of soy on menopause, researchers have found that two daily servings of soy can reduce the frequency and severity of hot flashes by up to 26 percent, compared to a placebo.
Until now, the evidence for soy has been inconclusive with some studies showing benefit and others finding no effect.
The interest in soy for hot flashes began when researchers noticed only about 10 percent of Asian women experience menopausal symptoms. It's been speculated that Asian women are less likely to have hot flashes due to their high soy consumption.
The current report, published online in Menopause: The Journal of the North American Menopause Association, reviewed 19 randomized controlled trials that enrolled more than 1200 women taking soy isoflavone extracts (not soy foods) or placebo.
When all studies were combined, there was a clear and consistent positive effect for isoflavones. Compared to placebo, consuming at least 54 milligrams daily for six weeks to a year reduced hot flash frequency by 20 percent and severity by 26 percent.
Women who took isoflavones for at least 12 weeks experienced a threefold greater reduction in hot flashes than women who consumed isoflavones for a shorter duration.
Isoflavone supplements with higher levels of genistein - one of the two main types of isoflavones in soybeans - were the most effective at easing hot flashes.
Genistein is the primary isoflavone found in soybeans and soy foods, suggesting that adding soy to your diet, or using supplements made from whole soybeans, may work better than synthetic isoflavone supplements.
All research on this web site is the property of Leslie Beck and is protected by copyright. Keep in mind that research on these matters continues daily and is subject to change. The information presented is not intended as a substitute for medical treatment. It is intended to provide ongoing support of your healthy lifestyle practices.
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