【英语时差8,16】新陈代谢

（单词翻译）

 In order to build tissue and repair it, however, anabolism¹ requires energy, as well as material with which to build. This energy and building material comes from the breaking down of larger, more complex material, a process called catabolism. As well as producing energy and building material, catabolism also breaks down material for excretion from the body. Both anabolism and catabolism are necessary for survival² and good health Understanding these processes can help one make good decisions about exercise and diet. For example, when an athlete trains her muscles, her muscle fibers³ break down. However, the daily recommended amount of protein is all that is needed to meet the anabolic and catabolic needs of the body and thus repair muscles fibers.