But modern animals have an interesting aid for digesting food.

但现代动物有一种帮助消化食物的有趣的方法。

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The body needs 20 minutes to begin digesting food and converting it to glucose.

身体需要20分钟的时间来消化食物并转化葡萄糖。

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Gut bacteria play crucial roles in digesting food and modulating the immune system.

肠道细菌在消化食物和调节免疫系统方面发挥了极其重要的作用。

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Some of them have to do with merely digesting food and moving the body around, and making the heart beat,and the lungs open and close.

有一些只负责消化食物或者身体活动，让心脏跳动，让肺部呼吸。

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"With social jet lag, we're forced to eat at times when the body doesn't want to eat, or isn't prepared for digesting food properly, " he says.

CNN: Is 'social jet lag' harming your health?

The bacteria that caused the recall is a strain of Escherichia coli, a bug that swims by the trillions in the digestive systems of people, cows and other mammals and is vital to digesting food.

FORBES: FDA Seeks Root Of Spinach Problem

While all that chewing and digesting of the fibrous food does burn calories, it doesn't burn a lot.

BBC: Who, Why, What: Can foods have negative calories?