In a study of "The hypoglycemic effects of soy isoflavones on postmenopausal women" by
Cheng SY, Shaw NS, Tsai KS, Chen CY.,researchers found that Two-way ANOVA revealed that fasting glucose (p < 0.001) and insulin (p < 0.005) levels were significantly affected by estrogen and isoflavone treatments after 6 months. For the isoflavone group, the average blood genistein concentration was 6-10 times higher than those of the estrogen group. Within the same periods, the fasting blood glucose was reduced to 83% and 85% of the baseline levels, and insulin was reduced to 56% and 67% of the baseline levels, respectively, in the estrogen and isoflavone groups. They concluded that Soy isoflavones (100 mg) and 0.625 mg conjugated estrogen equally lower fasting blood glucose and insulin levels in postmenopausal women.
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