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体重70kg的健康男性体内约有12kg蛋白质和17kg脂肪。12kg蛋白质分属肌肉和非肌肉蛋白质。体内蛋白质丢失超过30％即可引起死亡。相反,体内脂肪丢失30％只引起消瘦,而对功能活动和存活的影响很小。本文讨论:为什么体内蛋白质的维持对存活如此重要;如何测定蛋白质的更新;近来研究体内蛋白质更新变化的一些结果。蛋白质更新的重要性一健康成人体内每天合成和分解200～500g新蛋白质(50g氮)。但每天排出仅约10g氮。来源于蛋白质分解的大多数氨基酸,重新用于合成蛋白。这样,一个人平均一生要合成
About 70kg healthy body weight of about 12kg protein and 17kg fat. 12kg protein belongs to the muscle and non-muscle protein. In vivo protein loss of more than 30% can cause death. In contrast, a loss of 30% of body fat causes weight loss only, with little effect on functional activity and survival. This article discusses: Why protein maintenance in vivo is so important for survival; how to measure protein updates; and recent studies on some of the consequences of changes in protein turnover in the body. The importance of protein renewal A healthy adult daily synthesis and decomposition of 200 ~ 500g of new protein (50g nitrogen). However, only about 10 g of nitrogen is discharged per day. Most of the amino acids that come from proteolysis are reused for the synthesis of proteins. In this way, an average person to synthesize