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American Journal of Clinical Nutrition, Vol 62, 364-370, Copyright © 1995 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Protein requirements of marginally nourished lactating women

S DeSantiago, S Villalpando, N Ortiz, L Alonso and I Ramirez
Unidad de Investigacion en Nutricion, Hospital de Pediatria, Centro Medico Nacional, IMSS, Mexico.

Few experimental data regarding protein requirements of lactating women are available. This study was designed to determine the protein requirement of seven healthy lactating women from a poor Mexican community who were 2-6 mo postpartum and had a mean body mass index of 21.8 +/- 2 kg/m2. Nitrogen balances were performed at intakes of 0.8, 1.0, and 1.2 g.kg body wt-1.d-1 of a mixed protein diet (70% derived from vegetable sources). A balance at 1.2 g.kg body wt-1.d-1 of a high- quality mixed protein (80% from animal sources) was the reference. The experimental diets were designed to resemble the habitual diet in terms of energy and macronutrients. The balance responses to nitrogen intake were -35.5 +/- 12.6, -10.5 +/- 14.8, and 7.8 +/- 19.2 mg N.kg body wt- 1.d-1, respectively. Equilibrium balance was attained at 178.9 +/- 25.8 mg N (1.1 g protein.kg body wt-1.d-1), close to current recommended dietary allowances, albeit the dietary protein was mostly from vegetable sources.


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