The use of isoflavones during climaterium: Position statement of the Spanish Menopause Society

Introduction: Western countries have shown an increasing interest in the use of soya isoflavones to treat aging and menopause-related diseases and their associated symptoms, stimulating a proliferation of studies, many of which report contradictory results. Consequently, the role of isoflavones was assessed by the Spanish Menopause Society (SMS) using the most reliable scientific evidence. Material and methods: A panel of experts on isoflavones was gathered. The selected studies were obtained by electronic search engines, Medline (1966-March 2007) and the Cochrane Controlled Clinical Trials Registry. Results: The various reviews and meta-analysis on the effects of Isoflavones on women's health are controversial. The contradictory results may be due, among other factors, to the lack of uniformity in the compounds under study. Data on doses and genisteine content have indicated beneficial effects on lipid profile, like antioxidants, as well as a mild decrease in hot flushes. Some studies suggest a positive effect on bone mass. However few data are available on other aspects such as breast, estrogen-dependent cancer, cognitive function, or skin Conclusions: In certain situations, isoflavones can be a therapeutic alternative during the climacteric period. However, before general recommendations on the use of isoflavone supplements can be made, more specific clinical trials should be performed. These studies should be adequately designed, with supplements that are standarized according to isoflavone content and types, a sufficient number of patients and study duration.