为了分析和比较各种身体成分在代谢过程中的作用，常把人体区分为瘦体重（leanh吻mass）和体脂肪（fatwe恤）两部分。瘦体重包括全部代谢活泼组织及部分代谢不活泼组织（如细胞外液、骨骼无机盐等），即全身蛋白质、体水和无机盐，它的组成具有相对恒定性。瘦体重中最大比例成 In order to analyze and compare the effects of various body components in metabolic processes, the human body is often divided into two parts: lean mass (mass) and body fat (fatwe shirt). The lean body mass includes all metabolically active tissues and partially metabolically inactive tissues (such as extracellular fluids, bone inorganic salts, etc.), ie, systemic proteins, body waters, and inorganic salts, and its composition is relatively constant. The largest proportion of lean body weight