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Hooper, L. 
ORCID: https://orcid.org/0000-0002-7904-3331, Ryder, J. J., Kurzer, M. S., Lampe, J. W., Messina, M. J., Phipps, W. R. and Cassidy, A.
(2009)
Effects of soy protein and isoflavones on circulating hormone concentrations in pre- and postmenopausal women: a systematic review and meta-analysis.
Human Reproduction Update, 15 (4).
pp. 423-440.
ISSN 1460-2369
Abstract
BACKGROUND: Hormonal effects of soy and isoflavones have been investigated in numerous trials with equivocal findings. We aimed to systematically assess the effects of soy and isoflavones on circulating estrogen and other hormones in pre- and post-menopausal women. METHODS: The Cochrane Library, MEDLINE and EMBASE (plus reviews and experts) were searched to December 2007. Inclusion of randomized or residential crossover trials of soy or isoflavones for 4 or more weeks on estrogens, SHBG, FSH, LH, progesterone and thyroid hormones in women was assessed independently in duplicate. Six percent of papers assessed were included. Data concerning participants, interventions, outcomes, potential effect modifiers and trial quality characteristics were extracted independently in duplicate. RESULTS: Forty-seven studies (11 of pre-, 35 of post- and 1 of perimenopausal women) were included. In premenopausal women, meta-analysis suggested that soy or isoflavone consumption did not affect primary outcomes estradiol, estrone or SHBG concentrations, but significantly reduced secondary outcomes FSH and LH [by ∼20% using standardized mean difference (SMD), P = 0.01 and 0.05, respectively]. Menstrual cycle length was increased by 1.05 days (95% CI 0.13, 1.97, 10 studies). In post-menopausal women, there were no statistically significant effects on estradiol, estrone, SHBG, FSH or LH, although there was a small statistically non-significant increase in total estradiol with soy or isoflavones (∼14%, SMD, P = 0.07, 21 studies). CONCLUSIONS: Isoflavone-rich soy products decrease FSH and LH in premenopausal women and may increase estradiol in post-menopausal women. The clinical implications of these modest hormonal changes remain to be determined.
| Item Type: | Article |
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| Faculty \ School: | Faculty of Medicine and Health Sciences > Norwich Medical School |
| UEA Research Groups: | Faculty of Medicine and Health Sciences > Research Groups > Health Services and Primary Care Faculty of Medicine and Health Sciences > Research Groups > Epidemiology and Public Health Faculty of Medicine and Health Sciences > Research Centres > Population Health Faculty of Medicine and Health Sciences > Research Groups > Public Health and Health Services Research (former - to 2023) Faculty of Medicine and Health Sciences > Research Groups > Nutrition and Preventive Medicine Faculty of Medicine and Health Sciences > Research Groups > Cardiovascular and Metabolic Health |
| Depositing User: | EPrints Services |
| Date Deposited: | 25 Nov 2010 11:11 |
| Last Modified: | 04 Mar 2024 16:40 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/14091 |
| DOI: | 10.1093/humupd/dmp010 |
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