Soy reduces bone turnover markers in women during early menopause: A randomized controlled trial

Sathyapalan, Thozhukat, Aye, Mo, Rigby, Alan S., Fraser, William D., Thatcher, Natalie J., Kilpatrick, Eric S. and Atkin, Stephen L. (2017) Soy reduces bone turnover markers in women during early menopause: A randomized controlled trial. Journal of Bone and Mineral Research, 32 (1). 157–164. ISSN 0884-0431

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Abstract

Menopausal estrogen loss leads to an increased bone loss. Soy isoflavones can act as selective estrogen receptor modulators, their role in bone turnover is unclear. The primary outcome was assessing changes in plasma bone turnover markers. The secondary outcomes were assessing changes in cardiovascular risk markers including insulin resistance, blood pressure and lipid profile. We performed a double blind randomised parallel study where 200 women within 2 years after the onset of their menopause were randomised to 15 g soy protein with 66mg isoflavone (SPI) or 15 g soy protein alone (SP), daily for 6 months.There was a significant reduction in type I collagen crosslinked Beta C-telopeptide (βCTX) (bone-resorption marker) with SPI supplementation (0.40 ± 0.17 vs. 0.15 ± 0.09µg/L; p<0.01) compared to SP supplementation (0.35 ± 0.12 vs. 0.35 ± 0.13µg/L; p=0.92) after 6 months. There was also a significant reduction in type I procollagen-N-propeptide (P1NP) (bone-formation marker) with SPI supplementation (50.5 ± 25.0 vs. 34.3 ± 17.6µg/L; p<0.01), more marked between 3 and 6 month. Following SPI there was a significant reduction in fasting glucose, fasting insulin, insulin resistance and systolic blood pressure whereas no significant changes in these parameters was observed with SP. There were no significant changes in fasting lipid profile and diastolic blood pressure with either preparation. There was a significant increase in TSH and reduction in free thyroxine (p<0.01) with SPI supplementation though free tri-iodothyronine was unchanged. In conclusion, soy protein with isoflavones may confer a beneficial effect on bone health, analogous to the mode of action of anti-resorptive agents albeit to a less magnitude. There was a significant improvement of cardiovascular risk markers, but a significant increase in TSH and reduction in free thyroxine after SPI supplementation indicating a detrimental effect on thyroid function.

Item Type: Article
Uncontrolled Keywords: bone turnover markers,soy isoflavones,phytoestrogens,p1np,βctx,cardiovascular risk markers,thyroid function
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Depositing User: Pure Connector
Date Deposited: 24 Sep 2016 00:10
Last Modified: 19 Aug 2020 23:48
URI: https://ueaeprints.uea.ac.uk/id/eprint/59890
DOI: 10.1002/jbmr.2927

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