时差N小时 为什么我们想吃零食?(上)（在线收听）

Sometimes a snack quiets your growling stomach. But sometimes you just feel like munching, even though you're not really hungry.

有时，吃点零食可以让咕咕叫的肚子安静下来。但有些时候，尽管你并不饿但还是想吃点东西。

French researchers recently found that this second type of snack attack is harder on your waistline.

法国研究人员最近发现，第二种情况容易导致肥胖。

That's because when you eat without being hungry, blood sugar and insulin work differently than when you are hungry.

这是因为当你在不饿时进食，体内血糖和胰岛素的变化与饥饿时候是不同的。

First, let's see what happens when you're hungry. Low blood sugar can trigger that hungry feeling.

首先，让我们看看当你饥饿时的情况。低血糖会让你产生饥饿感。

When you eat, your blood sugar rises, satisfying your hunger and prompting your pancreas to secrete insulin.

当你进食时，体内的血糖会上升，缓解你的饥饿感并促使胰脏分泌胰岛素。

Insulin's job is to transport sugar from the bloodstream into your body cells.

而胰岛素负责把血液中的糖分输送到体内的细胞中。

Hours later, after insulin has moved enough sugar into the cells and leveled off, your blood sugar dips and you feel hungry again.

几小时后，当胰岛素把充足的糖分输送到细胞内并趋于稳定时，你的血糖会下降，然后你又会感到饥饿。