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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 folderEvaluation of the nutritive value of a rice-and-bean-based diet for agricultural migrant workers in Brazil
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View the documentExperimental details
View the documentSummary of main results
View the documentConclusions and comments

Conclusions and comments

The rice-and-bean diet satisfied the men's energy requirements, at least under the conditions of this short-term metabolic study.

TABLE 4. Nitrogen Balance and Apparent Digestibility of Dietary Nitrogen(Means of Five Days)

Subject Nitrogen intake (mg/kg/day) Total urinary nitrogen (mg/kg/day) Faecal nitrogen (mg/kg/day) Apparent nitrogen balance (mg/kg/day) "True" nitrogen balance* (mg/kg/day) Apparent digestibility (%)
1 162.9 109.9 43.5 9.5 4.5 73.3
2 210.6 130.0 54.4 26.2 21.2 74.2
3 176.2 140.4 46.2 - 10.5 - 15.5 73.8
4 170.8 138.5 38.3 - 6.0 - 11.0 77.6
5 160.6 98.4 59.9 2.4 - 2.6 62.8
6 204.3 108.1 81.1 15.0 10.0 60.3
7 165.3 88.4 59.9 17.0 12.0 63.8
8 204.7 146.0 63.4 - 4.7 - 9.7 69.0
9 222.2 137.0 75.3 9.8 4.8 73.4
10 168.6 128.1 44.6 - 4.2 - 9.2 67.5
11 1653 92.6 53.8 18.9 13.9 65.6
12 166.6 92.6 57.3 16.7 11.7 69.9
13 207.5 107.2 62.4 37.9 32.9 73.7
14 173.5 120.5 45.6 7.4 2.4 69.3
Mean 182.8 117.0 56.1 9.7 4.7 69.3
S.D. 21.7 16.9 12.2 13.6 - 5.2

* Assuming miscellaneous losses of 5 mg/kg/day.

Based on these results, the energy and protein needs of these workers could be met if sufficient amounts of the rice-and bean diet were available. This is not always the case at the community level, since preliminary surveys showed that there were inadequate intakes of energy, protein, and other nutrients.