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Protein Quality of High-Protein and Low-Protein Milled Rices in Preschool Children¹

Food and Nutrition Research Institute, National Science Development Board, Manila, Philippines, and Chemistry Department, International Rice Research Institute, Los Baños, Laguna, Philippines

High-protein (11.0%, IR480-5-9) and low-protein (7.1%, IR32) milled rices were compared with casein as a control when fed as the main source of dietary N to eight apparently normal Filipino children, 1.5 to 2.0 years of age. Daily diets were formulated to contain 250 mg N and 100 kcal/kg body weight. Apparent digestibility of 60.0% for high-protein rice was lower than for low-protein rice (66.2%), and higher values of 76.8 and 80.8% were obtained for the two casein control diets. Corresponding apparent retentions were similar for the two rices, at 23.4 and 26.9%, respectively, as compared to 25.0 and 38.6% for the two casein control diets. These results support previous data on children fed non-isonitrogenous rice-based diets indicating that an increase in protein content of milled rice results in only a slight decrease in its protein quality. The results were similar to those obtained with Peruvian children on a similar protocol.

KEY WORDS: • rice • protein quality • child nutrition

¹ Supported in part by U.S. Agency for International Development Grant AID/TS-G-1446, Sept. 15, 1977 to Sept. 14, 1978. Approved by the Philippine Committee on Human Rights in Clinical Investigations, Manila. Informed consent was obtained from the parents or guardians of all children in the study. Presented in part at the 11th International Nutrition Congress, Rio de Janeiro, Brazil, Aug. 27–Sept. 1, 1978.

Manuscript received 18 August 1978.