"Taking soy to relieve hot flashes https has received mixed reviews over the years. Now researchers who took another look at  published studies find that soy supplements https_AssetsscopemapsWebMDConsumerPagesVitaminsandSupplementsLifestyleGuide_ecedpage_VitaminsandSupplementsLifestyleGuide_eced.xml may help at least over time. Soy has been touted as an alternative treatment to hormone replacement therapy https after HRT was linked to an increased risk of breast cancer https For many women with symptoms and especially with concerns about hormone replacement therapy https trying soy for six to  weeks to see if it relieves their symptoms could be a first line of treatment says Melissa Melby PhD a professor of medical anthropology at the University of Delaware. The study is published in Menopause https The Journal of The North American Menopause https Society. Two coauthors not including Melby have ties to the soy industry. The study had no industry funding. Although all the studies looked at soy supplements https Melby says that getting soy from food is a better bet. What this study shows is that ingesting soy isoflavones will help you she says. I personally think foods containing soy are better. Soy for Hot Flashes Another Look Melby looked for published studies of soy for hot flashes in the medical literature through midDecember . All the studies compared the soy to a placebo https More than  women were in the studies which included the U.S. and nine other countries. The studies continued for six weeks up to a year and included different amounts of soy supplements https The researchers pooled the results of the individual studies to come up with their findings. Soy supplements with higher amounts of the isoflavone called genistein were more than twice as good at reducing hot flash frequency than those with low amounts Melby found. If you prefer to get your soy from food Melby suggests two servings of soy foods per day. That is roughly equal to two glasses of soy milk  ounces of tofu or half a cup of edamame. Soy for Hot Flashes Second Opinion The new analysis leaves a lot unanswered says Silvina Levis MD a professor of medicine and director of the osteoporosis https center at the University of Miami. In her own research published in  in the Archives of Internal Medicine she found no effects on menopausal symptoms when women took  mg of soy isoflavones for two years. I think this study does not provide answers to women says Levis who reviewed the findings. Because the studies vary greatly in their methods and the preparations used she says we still dont know who are women who will benefit. Another expert Penny KrisEtherton PhD RD a distinguished professor of nutrition https at Pennsylvania State University calls the results very impressive. KrisEtherton who reviewed the findings but did not participate in the study noted some limitations though. Most of the women were white. We do not know if the effects of soy products would elicit similar effects in women of different ethnicity she says. The results vary she says and it doesnt appear to be a quick fix. In the studies of longer duration she says the effects were greater."