Effect of high-fat intake on lactogenic hormone bioactivity in premenopausal women.
To determine if dietary fat affects the bioactivity of circulating prolactin and growth hormone (lactogenic hormones), a controlled feeding study was conducted in six premenopausal women over two complete menstrual cycles. After an initial 7-10 d dietary adjustment, subjects were randomly assigned to either low-fat (25% of calories) or high-fat (46%) diets. The diets were similar in proportions of energy, protein, P:S ratio, and cholesterol. All subjects completed both diets in a crossover experimental design. Fasting blood samples were collected on alternate days throughout the study. Plasma hormone bioactivity was assayed by the Nb2 lymphoma cell method. Luteal-phase lactogenic hormone bioactivity appeared to be higher (averaging 28%; p less than 0.07) in response to high- rather than low-fat diets. No differences were seen in levels of radioimmunoreactive prolactin or growth hormone. Substantial changes in short-term fat intake may alter the level of lactogenic hormone bioactivity in young women.
Shultz
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TD
Department of Biochemistry, School of Medicine, Loma Linda University, CA 92350.
Rose
D P
DP
D000328:Adult; D001682:Biological Availability; D001786:Blood Glucose / Q000032:analysis; D002791:Cholesterol, Dietary / Q000032:analysis; D004041:Dietary Fats / Q000032:analysis / Q000494:pharmacology*; D004044:Dietary Proteins / Q000032:analysis; D004734:Energy Metabolism; D005260:Female; D013006:Growth Hormone / Q000097:blood; D006801:Humans; D008597:Menstrual Cycle; D011388:Prolactin / Q000097:blood*; D011863:Radioimmunoassay
D001786:Blood Glucose; D002791:Cholesterol, Dietary; D004041:Dietary Fats; D004044:Dietary Proteins; D011388:Prolactin; D013006:Growth Hormone