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Studies on Protein Requirements of Young Men Fed Egg Protein and Rice Protein with Excess and Maintenance Energy Intakes

Department of Nutrition, School of Medicine, Tokushima University, Tokushima 770, Japan

Following a period of eating a standard diet, young men were given diets containing low levels of egg or rice protein varying stepwise from 0.28 to 0.76 g/kg for 3 weeks. To determine the effect of excess energy intake with a low protein diet, the subjects were divided into two groups: one group received the same level of energy as with the standard diet (ca. 45 ± 2 kcal/kg), while the other was given a daily surplus of about 700 to 1,000 kcal (ca. 57 ± 2 kcal/kg). Protein requirements were estimated by regression analysis of balances at different levels of intake. Results showed that: 1) Administration of excess energy spared loss of labile protein and reduced the time required for adaptation to a low protein diet, with establishment of a nitrogen balance at a lower level than with a maintenance energy diet. 2) Supply of excess energy resulted in increased availability of ingested protein, with a reduction of the protein requirement: with maintenance energy the practical requirements were estimated as 0.65 g/kg with 44 NPU for egg protein and 0.87 g/kg with 33 NPU for rice protein, whereas with excess energy the minimum requirements were 0.46 g/kg with 63 NPU and 0.58 g/kg with 50 NPU, respectively. The possibility that the biological value of dietary protein may be variable rather than constant was discussed.

KEY WORDS: • excess energy • protein sparing effect • labile protein loss • protein requirement • NPU • biological value • egg • rice

Manuscript received 27 April 1973.