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七、人的营养人体需要的营养中,蛋白质是构成身体细胞的基本物质。它占人体总干重的50％,肌肉、骨骼、软骨、血液、淋巴液都含蛋白质,所有的酶和许多激素也都是蛋白质。人体需要蛋白质的量,普通平均体重每公斤需蛋白质1—1.5克。老年人以一克为宜。因为人体的皮肤、肌肉等的蛋白质150天左右就要更新一半,而肝脏和血浆的蛋白质10天中就要更新一半。
Seven, human nutrition Nutrition needs of the human body, the protein is the basic material constituting the body cells. It accounts for 50% of the body’s total dry weight, muscle, bone, cartilage, blood, lymph fluid contains protein, all enzymes and many hormones are also proteins. The body needs the amount of protein, the average average weight of 1-1.5 grams per kilogram of protein needed. One gram of the elderly is appropriate. Because the body’s skin, muscle and other proteins about 150 days will be updated half, while the liver and plasma proteins will be updated in 10 days half.