You have to bring all of these components together so they can function as one.

你必须把所有这些组成部分结合起来，使它们能够作为一个整体发挥作用。

But when you're not eating, your body needs a way to access energy from somewhere so you can still function.

而不吃饭时，需要从其他途径获得能量才能活下去。