Inside each of us are two little workers. They keep tabs on how our body is doing in a little control room and they know how much each area needs to maintain itself when everything is working well. When they see something not working right because of things such as sickness or injury, they send more stuff than normal to that area in an attempt to fix said problem.
They work as much as we do. If we don’t have much body movement, they don’t either. If we exercise often, they work harder.
Some of the stuff we send them through our mouth hurts us and they don’t understand that. What we eat ends up being what fuels them.
This is the simple way I explain, what I just explained, to me.