Consumption of animal products, their nutrient components and postmenopausal circulating steroid hormone concentrations

Brinkman MT, Baglietto L, Krishnan K, English DR, Severi G, Morris HA, Hopper JL, Giles GG (2010) Consumption of animal products, their nutrient components and postmenopausal circulating steroid hormone concentrations. Eur J Clin Nutr 64:176-183

BACKGROUND/OBJECTIVES: Little is known about nutritional factors that influence circulating concentrations of steroid hormones, which are consistently associated with risk of breast cancer for postmenopausal women. We aimed to investigate the association between consumption of animal products and the plasma concentrations of steroid hormones and sex hormone-binding globulin (SHBG). SUBJECTS/METHODS: Cross-sectional analysis was conducted on plasma from 766 naturally postmenopausal women. We measured plasma concentrations of steroid hormones and SHBG, and estimated dietary intakes using a 121-item food frequency questionnaire. Log-transformed values of hormone concentrations were regressed on quartiles of intake of meat and dairy products among food items, and fats, proteins and cholesterol among nutrient intake. RESULTS: Total red and fresh red meat consumption was negatively associated with SHBG levels (P for trend=0.04 and <0.01, respectively).="" mean="" shbg="" concentrations="" were="" approximately="" 8%="" and="" 13%="" lower="" for="" women="" in="" the="" highest="" quartile="" compared="" with="" the="" lowest="" quartile="" of="" total="" red="" and="" fresh="" red="" meat="" consumption,="" respectively.="" positive="" associations="" were="" observed="" between="" dairy="" product="" consumption="" and="" total="" and="" free="" estradiol="" concentrations="" (p="" for="" trend="0.02" and="" 0.03,="" respectively).="" mean="" concentrations="" of="" total="" and="" free="" estradiol="" were="" 15="" and="" 14%="" higher="" for="" women="" in="" the="" highest="" quartile="" of="" dairy="" product="" consumption="" than="" for="" those="" in="" the="" lowest="" quartile,="" respectively.="" no="" associations="" were="" observed="" with="" consumption="" of="" processed="" meat,="" chicken,="" fish,="" eggs,="" cholesterol,="" fats="" or="" protein.="" conclusions:="" our="" study="" suggests="" that="" greater="" consumption="" of="" total="" red="" and="" fresh="" red="" meat="" and="" dairy="" products="" might="" influence="" circulating="" concentrations="" of="" shbg="" and="" estradiol,="" respectively.="" confirmation="" and="" further="" investigation="" is="">