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人体随着年龄的增长,在30-40岁以后各种机能都有逐渐下降的趋势。老年人物质代谢强度明显降低。基础代谢值和蛋白质的更新速度只相当于青年人的80％左
With the growth of the human body, in the 30-40 years after the various functions have a gradual downward trend. Elderly people significantly reduced the intensity of material metabolism. The basal metabolic rate and protein update rates are only about 80% of young people left