To be fair, soybeans contain genistein & glycitein isoflavones in addition to daidzein. Moreover, the women studied in this group were 5 years post-menopausal and thus, conceivably past the worst of their symptoms since most reported not being bothered by either vasomotor or sexual symptoms at baseline. The participants were also of normal weight so it's possible that these results won't apply to the two-thirds of the population that are either overweight or obese.
Nevertheless, while soy supplementation may not have worked in this particular trial, there is no reason to prohibit consumption of soybeans as part of a healthy diet. Perhaps some women will receive adequate benefit when other isoflavones are consumed, rather than a single one in isolation. Certainly, soybeans are a good source of complete protein & fiber w/o the saturated fat found in land animal-based proteins .
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