Dietary intake of soybean protein and menstrual cycle length in pre-menopausal Singapore Chinese women

Public Health Nutrition

Lynn Alexander¹  Joy Leong¹  Rupert W Jakes¹  Lin Han Chen¹  Stephen W Duffy¹  Wei Hong Lee¹ 

关键词: Phyto-oestrogens;    Soybean protein;    Menstrual cycle length;    Breast cancer risk;   

DOI  :  10.1079/PHN200063

学科分类：卫生学

来源: Cambridge University Press

【 摘 要 】

BackgroundIntake of soybean protein was associated with a reduced risk of breast cancer in a case–control study. It has also been demonstrated to increase menstrual cycle length in an experimental setting.ObjectiveTo ascertain whether the association of soybean protein intakes with menstrual cycle length persists in an uncontrolled community setting.DesignCross-sectional food frequency dietary survey, menstrual cycle survey and prospective collection of menstrual cycle data.SettingA hospital clinic and a nursing college.SubjectsTwo hundred menstruating women.ResultsAn association (P=0.034) of higher intakes of soybean protein with increased menstrual cycle length, as recorded by self report and by prospectively recording three consecutive cycles, was observed. The risk of menstrual cycle length being greater than the median, when comparing the upper quartile (8.7–35.2 g day−1) of soybean intake and the lowest quartile (0.1–3.3 g day−1) was double, and this approached statistical significance (OR=2.02, 95% CI=0.88−4.64 and OR=1.93, 95% CI=0.82−4.56 for self-reported cycle length and cycle length as recorded by diary, respectively). In terms of the absolute association with cycle length, subjects in the upper quartile of soybean intake demonstrated a cycle length 1–2 days longer than did subjects in the lowest quartile.ConclusionsIt is likely that the association between dietary intake of soybean protein and length of menstrual cycle prevails in the community setting. This is shown using both self-reported cycle length and cycle length as recorded in a prospective diary.

【 授权许可】

Unknown