Now the bank for calories is body fat.

身体脂肪就是这些能量的储存库
If you take in more calories than you consume,

如果你摄入的热量超过消耗的
it gets stored in the fat cells,

热量就会存储在脂肪细胞中
that's the energy bank that you can draw upon

这就是能量库你可以在
if you don't have enough food and starvation or famine were an issue.

食物不够以及饥饿或饥荒的时候利用它
People do that with differing levels of efficiency.

人们存储能量的效率各不相同
Each of you probably know,

你们每个人可能都知道
some of you may be in this category yourself,

你们中有些人是那种
people who can eat like crazy and still not gain weight.

怎么吃都不会发胖的人
Those people are the envy of many other people.

这些人是令人羡慕的
You eat, and eat, and eat and those people don't gain weight.

那些人大吃特吃却不发胖
Then there are other people who are pretty careful about what they eat

还有一类人非常注意控制饮食