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close this bookProtein-Energy Requirements of Developing Countries: Evaluation of New Data (UNU, 1981, 268 p.)
close this folderResearch papers: Protein requirements-adults, standard protocols
close this folderProtein requirements of young male adults with a rural Mexican diet
View the document(introduction...)
View the documentObjective
View the documentExperimental details
View the documentSummary of the main results
View the documentConclusions


  1. Mean protein requirements for milk and rural diets were very close: 103 and 112 mg N/kg body weight, respectively, equivalent to 0.66 and 0.70 9 of protein/kg body weight. Even the mean requirement obtained for the milk diet (0.66 g/kg) was notably above the recommendation of FAD/WHO 1973. The safe levels of intake for 97.5 per cent of the population (PR0.975) were, respectively, 121.6 and 136.4 mg N/kg body weight.
  2. Since the chemical score for the rural and milk diets was 71 per cent (limiting amino acid: Iysine) and 94 per cent (limiting in sulphur amino acids), respectively, theoretically the protein requirement mean (PRm) for the rural diet should have been about 136.5 mg N/kg, and PRo 975 should have been 161 mg N/kg. The values found experimentally were much lower, suggesting that the lysine value in the 1973 FAO/ WHO provisional pattern may be too high
  3. Neither the different clinical laboratory parameters measured nor the indices of body composition obtained from somatometric measurements showed any changes or abnormalities.
  4. Subject A.D.F. exhibited a distinct increase in protein requirement when on the rural diet. Although a native of Malinalco, he had moved to Mexico City for several months, where be became accustomed to a daily intake of meat, eggs, and milk. Considering his dietary pattern, it would seem as though he had "lost" his ability to utilize the protein in a rural diet.