When do you become hungry?

什么时候你开始感到饥饿
What triggers some awareness in your mind that you're ready to eat?

什么因素触发了你想要开始进食的欲望
That would determine meal initiation or snack initiation, or whatever.

这将决定你是吃主食吃零食或其他
The size of the meal of course is an important factor,

进食量当然是个重要因素
and there are real differences here between the meal initiation

在进食开始与进食量之间
and the meal size, and then the meal termination comes in here as well.

是有明显区别的还有进食终止的环节
There have been very interesting studies over the years

有关这个问题的研究已经持续多年
using different drugs with animals to look at

主要方法是通过动物实验来观察
what it does to their appetite.

不同的药物对其食欲的影响
Of course the pharmaceutical companies have done

当然医药公司已经做过上万次
thousands and thousands of these studies in hope of finding drugs

这种研究以期待发现某些药物
that will help people with their eating and their weight.

可以帮助人们控制饮食和体重