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What is metabolism really?
新陳代謝是什么？
Statements like “he can eat a lotbecause he has a fast metabolism” are somewhat misleading.
“他很能吃是因為他新陳代謝很快”像這樣的說法有點誤導我們。
Metabolism isn't about the digestion of food in your stomach;
新陳代謝不是指食物的消化能力，
it's the name given to all of the chemical changes that occur in an organism's tissue cells.
而是指一種在組織細胞內發生的化學變化。
There are basically two kinds of chemical changes that can occur; tissue matter can be built,or it can be broken down.
基本上可分為兩類化學反應：合成或分解組織細胞。
These processes are called anabolism and catabolism.
這些過程叫作合成代謝和分解代謝。
More specifically, anabolism is responsiblefor an organism's growth, its maintenance, and the repair of its tissues.
具體地說，合成代謝負責有機組織的數量增長，維護和修復。
So when you cut yourself and your skin scabs over and heals, you're seeing anabolism at work.
所以，當皮膚割傷后會自動結疤愈合，這就是合成代謝在起作用。
Or if you grow taller or wider, that's also evidence of anabolism.
要建造和修復組織細胞，合成代謝需要能量和原料。
In order to build tissue and repair it, however, anabolism requires energy, as well as material with which to build.
或者長高長胖，那也是合成代謝。
This energy and building material comes from the breaking down of larger, morecomplex material, a process called catabolism.
而能量和原料就來自于分解更大，更復雜的細胞，這個過程就叫分解代謝。
As well as producing energy and building material,catabolism also breaks down material for excretion from the body.
與合成反應一樣，分解代謝需要的能量和原料來自于身體的分泌物。
Both anabolism and catabolism are necessary for survival and good health.
合成和分解代謝在對于身體健康很重要。
Understanding theseprocesses can help one make good decisions about exercise and diet.
而了解這些過程可以幫助我們對運動和飲食做出更好的決定。
For example, when anathlete trains, her muscle fibers break down.
例如，運動員訓練時他的肌纖維會受損。
However, the daily recommended amount of proteinis all that is needed to meet the anabolic and catabolic needs of the body and thus repair musclesfibers.
所以每日推薦的蛋白質就是身體合成和分解代謝所需的量，這樣才能修復肌纖維。
