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Have you ever wondered why some days all you want to do is snack? 不知道你有没有想过这个问题：为什么有时候你会不停地想吃东西？ Under normal circumstances, we feel hungry when we have burnt up the food we have eaten as energy and our blood sugar and insulin levels begin to drop. Ghrelin, a hormone connected to appetite, then communicates this to the brain, which is how we feel the need to eat. 在正常情况下，当身体把食物转为能量消耗掉之后，我们的血糖和胰岛素水平也开始降低，这时我们就会感到饥饿。然后，饥饿激素将这个信息传达给大脑。这样我们就会感觉到需要吃东西了。 | 
