Effects of soy isoflavone supplementation on bone mineral density in postmenopausal women: a meta-analysis

Summary

This meta-analysis by Wei et al. (2012) synthesises evidence from randomised controlled trials investigating whether soy isoflavone supplementation attenuates bone mineral density loss in postmenopausal women. The paper likely reports a modest but statistically significant positive effect on BMD at key skeletal sites, consistent with the oestrogenic activity of isoflavones such as genistein and daidzein. The findings contribute to the evidence base on phyto-oestrogens as a non-hormonal dietary intervention for osteoporosis risk reduction in this population.

UK applicability

Although the study draws on international trial data, the findings are broadly applicable to UK postmenopausal women, particularly given rising rates of osteoporosis and clinical interest in alternatives to hormone replacement therapy. UK dietary guidelines and NICE guidance on osteoporosis prevention may be informed by this evidence, though typical UK dietary isoflavone intake is considerably lower than supplemental doses studied.

Key measures

Bone mineral density (g/cm²) at lumbar spine, femoral neck, and/or total hip; standardised mean difference or weighted mean difference across trials

Outcomes reported

The meta-analysis examined the effect of soy isoflavone supplementation on bone mineral density (BMD) at various skeletal sites in postmenopausal women. It likely pooled data from multiple randomised controlled trials to estimate the magnitude and consistency of any protective effect on bone loss.

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