Format

Send to

Choose Destination
Am J Clin Nutr. 1990 Mar;51(3):378-84.

Dietary protein and nitrogen balance in lactating and nonlactating women.

Author information

1
USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX.

Abstract

Adaptive responses of body protein metabolism to dietary protein intakes of 1.0 g.kg body wt-1.d-1 were determined by nitrogen balance and urinary 3-methylhistidine excretion in lactating and nonlactating women. Despite higher energy intakes (p less than 0.04), lactating women had lower nitrogen balances compared with nonlactating postpartum and nulliparous women (p less than 0.001). Nitrogen losses in milk did not account entirely for these differences. Nitrogen balance showed linear (p less than 0.04) and quadratic (p less than 0.03) trends over time postpartum among the lactating women. Urinary 3-methylhistidine excretion also was reduced (p less than 0.05) in lactating compared with nonlactating women. These observations suggest that protein intakes of 1.0 g.kg body wt-1.d-1 in lactating women are associated with adaptive responses that promote the conservation of skeletal muscle protein stores and that currently recommended dietary protein allowances may be insufficient to meet the nutritional needs of well-nourished lactating women.

PMID:
2309644
DOI:
10.1093/ajcn/51.3.378
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Silverchair Information Systems
Loading ...
Support Center