Four trials that were not combined in meta-analyses suggested that extracts with high ( > 30 mg/d ) levels of genistein consistently reduced the frequency of hot flushes .
BACKGROUND Vasomotor symptoms , such as hot flushes and night sweats , are very common during the menopausal transition .
Hormone therapy has traditionally been used as a highly effective treatment , but concerns about increased risk of some chronic diseases have markedly increased the interest of women in alternative treatments .
Some of the most popular of these treatments are foods or supplements enriched with phytoestrogens-plant-derived chemicals that have estrogenic action .
OBJECTIVES To assess the efficacy , safety and acceptability of food products , extracts and dietary supplements containing high levels of phytoestrogens when compared with no treatment , placebo or hormone therapy for the amelioration of vasomotor menopausal symptoms ( such as hot flushes and night sweats ) in perimenopausal and postmenopausal women .
Effect of soy phytoestrogens on hot flashes in postmenopausal women with breast cancer: a randomized, controlled clinical trial.
PURPOSE Vasomotor symptoms , such as hot flashes and night sweats , in breast cancer survivors are often worsened by chemotherapy and tamoxifen , and /or the discontinuation of hormone replacement therapy at diagnosis . This study evaluated the acceptability and effectiveness of a soy beverage containing phytoestrogens as a treatment for hot flashes in postmenopausal women with breast cancer . METHODS A r and omized , placebo-controlled , double-blind clinical trial was conducted in postmenopausal women with moderate hot flashes who were previously treated for early-stage breast cancer . Women were stratified for tamoxifen use and r and omized to a soy beverage ( n = 59 ) containing 90 mg of isoflavones or to a placebo rice beverage ( n = 64 ) . Women recorded the number and severity of hot flashes daily with a daily menopause diary for 4 weeks at baseline and for 12 weeks while consuming 500 mL of a soy or placebo beverage . RESULTS There were no significant differences between the soy and placebo groups in the number of hot flashes or hot flash scores . However , presumably because of a strong placebo effect , both groups had significant reductions in hot flashes . Mild gastrointestinal side effects were experienced by both groups but occurred with greater frequency and severity with soy . The mean serum genistein concentration at 6 weeks was significantly higher in women who consumed soy ( 0.61 + /- 0.43 micromol/L ) compared with placebo ( 0.43 + /- 0.37 micromol/L ) ( P = .02 ) . Overall acceptability and compliance were high and similar in both groups . CONCLUSION The soy beverage did not alleviate hot flashes in women with breast cancer any more than did a placebo . Future research into other compounds is recommended to identify safe and effective therapies for hot flashes in breast cancer survivors
Four trials that were not combined in meta-analyses suggested that extracts with high ( > 30 mg/d ) levels of genistein consistently reduced the frequency of hot flushes .
BACKGROUND Vasomotor symptoms , such as hot flushes and night sweats , are very common during the menopausal transition .
Hormone therapy has traditionally been used as a highly effective treatment , but concerns about increased risk of some chronic diseases have markedly increased the interest of women in alternative treatments .
Some of the most popular of these treatments are foods or supplements enriched with phytoestrogens-plant-derived chemicals that have estrogenic action .
OBJECTIVES To assess the efficacy , safety and acceptability of food products , extracts and dietary supplements containing high levels of phytoestrogens when compared with no treatment , placebo or hormone therapy for the amelioration of vasomotor menopausal symptoms ( such as hot flushes and night sweats ) in perimenopausal and postmenopausal women .