Cheng A H, Gomez A, Bergan J G, Lee T C, Monckeberg F, Chichester C O
Am J Clin Nutr. 1978 Jan;31(1):12-22. doi: 10.1093/ajcn/31.1.12.
The protein requirement and the efficiency of protein used were studied in young and old adult human subjects. Protein intake levels (N X 6.25) of 0.4, 0.8, and 1.6 g/kg body weight per day from a combination wheat-soy-milk mixture were fed. Caloric intake was held constant at 40 kcal/kg body weight per day throughout the 11-day study of each dietary period. No significant differences were observed in their protein requirement, efficiency of protein use or the ability to adapt to changes of protein intake levels. Protein digestibility was not impaired in the aged. It is concluded that the protein requirement and the efficiency of protein use are not affected by the aging process.
对年轻和老年成年人进行了蛋白质需求量及蛋白质利用效率的研究。通过食用由小麦、大豆和牛奶混合而成的食物，使蛋白质摄入量水平（氮×6.25）分别达到每天0.4、0.8和1.6克/千克体重。在每个饮食阶段为期11天的研究中，热量摄入保持恒定，为每天40千卡/千克体重。在蛋白质需求量、蛋白质利用效率或适应蛋白质摄入量变化的能力方面，未观察到显著差异。老年人的蛋白质消化率并未受损。研究得出结论，蛋白质需求量和蛋白质利用效率不受衰老过程的影响。
