In the colon, microbes synthesise vitamins for us and provide 10% of our calories by breaking down dietary fibre we cannot process.

在结肠内，微生物帮我们合成维生素并且通过分解我们不能消化的食物纤维给我们提供10%的卡路里。

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This energy and building material comes from the breaking down of larger, more complex material, a process called catabolism.

而能量和原料就来自于分解更大，更复杂的细胞，这个过程就叫分解代谢。

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When you swallow food, it travels down your esophagus into your stomach. Here enzymes and acids go to work on the food, beginning the process of breaking the food down.

你吞下的食物会穿过食道进入胃里，胃里的各种酶和酸会分解食物，开始消化的过程。

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