前言本世纪40年代,生理学家仍认为脂肪组织在代谢上是无活动能力的。它所储存的脂肪,是由肝脏合成的。它之所以储存脂肪,是为了当时的需要;换言之,储存的脂肪,在代谢上是不活动的,只有当机体需要时,它才参加代谢作用。这种认识是不正确的。由于研究代谢的工具改进,首先认识到,脂肪组识储存的脂肪,虽其量及质都恒定, Preface In the 1940s, physiologists still think that adipose tissue is metabolically inactive. The fat it stores is synthesized by the liver. The reason fat is stored for immediate needs; in other words, stored fat is metabolically inactive and only metabolized when it is needed by the body. This understanding is not correct. Due to the improvement of the tools for studying metabolism, it is first recognized that the fat stored in the fat tissue, although its amount and quality are constant,