Menstrual cycle and protein requirements of women

D. H. Calloway, M. S. Kurzer

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A nitrogen balance study was done to determine the protein requirement of healthy young women and to evaluate the impact of the menstrual cycle on nitrogen utilization. Six healthy young women were fed a defined formula diet with progressively decreasing levels of egg white proteins: 4 mg nitrogen/basal kcal for 42 days, 3 mg nitrogen/basal kcal for 28 days and 2.5 mg nitrogen/basal kcal for 22 days. Dietary energy was fixed at about 38 kcal/kg body weight and exercise was standardized. Excreta, menstrual fluids, and integumentary losses were collected. A statistically significant (P<.001) biphasic cycle in urinary nitrogen excretion was found in every subject. Linear regression analysis predicted nitrogen requirement to be 73 ± 20 mg nitrogen/kg body weight. When expressed per kilogram of body weight, there appears to be no significant difference in protein requirement between women and men. The urinary nitrogen cycle, however, was found to be unique to women, implying a hormonal regulation of nitrogen utilization. The failure to account for this cycle in women could lead to erroneous estimates of nitrogen requirement or large coefficients of variation.

Original languageEnglish (US)
Pages (from-to)356-366
Number of pages11
JournalJournal of Nutrition
Volume112
Issue number2
DOIs
StatePublished - Jan 1 1982

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Menstrual Cycle
Nitrogen
Proteins
Body Weight
Nitrogen Cycle
Egg Proteins
Formulated Food
Linear Models
Regression Analysis
Exercise

Cite this

Menstrual cycle and protein requirements of women. / Calloway, D. H.; Kurzer, M. S.

In: Journal of Nutrition, Vol. 112, No. 2, 01.01.1982, p. 356-366.

Research output: Contribution to journalArticle

Calloway, D. H. ; Kurzer, M. S. / Menstrual cycle and protein requirements of women. In: Journal of Nutrition. 1982 ; Vol. 112, No. 2. pp. 356-366.
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