For more than 20 years researchers have evaluated the effects of soyfoods and soybean isoflavones on menopausal hot flashes. The latest and most comprehensive analysis of the research shows that isoflavones are very helpful in alleviating hot flashes. Now, a new study from the School of Heilongjiang Bayi Agricultural University and Harbin Medical University in China adds to this evidence.
For this 6-month study, 80 women were randomly divided into two groups. On group consumed 90 milligrams of soy isoflavones per day and the other was given a placebo. Ninety milligrams is the amount provided by about three servings of soyfoods. Thirty-seven women completed the trial in the isoflavone group and 33 in the placebo group.
The results showed several significant effects of isoflavones. Of these, the most important was a nearly 64 percent decrease in hot flash frequency in the isoflavone group compared to only a 16.3% decrease among women taking the placebo. The difference between these two groups was statistically significant. Interestingly, in addition to the decrease in hot flashes, women in the isoflavone group also experienced an increase in bone mineral density.
Chi X-X, Zhang T. The effects of soy isoflavone on bone density in north region of climacteric Chinese women. J Clin Biochem Nutr 2013;53:102–107.