Why do we eat?

Why do we eat? I always think about this question. Why must we eat? I did not realise my question would create such a fuss. Unfortunately, everything is physics and I am really poor in physics. So i just find some informations from internet and wrote it in my blog by myself and to tell others why do we eat.

Alright,this question is a serious question. Why do we eat? We eat to replace lost energy. Why do we lose energy? Because our environment draws energy away from us. In order to exist we need to replace that loss. This process sets up a flow of energy through a system. When the flow stops, the system dies. We spend our lives in the pursuit of energy. Either as food,or fuel, or even money which is a form of abstract energy. This pursuit is the be all and end all of life as we know it. It drives evolution.

The process of evolution is one of trying to secure energy input that is ahead of energy loss. All living things chase energy to exist. Evolution is not driver by this process it is led by this process. The need to acquire energy precedes the acquisition of energy. In the real world we do not eat when we are not hungry. Our bodies need to be nearing a point of energy loss such that we are driven to seek a source of energy, as food, to put us in a position of energy surplus.

Life as a process can only exist if there is a flow of energy through that life form and this process is led not driven. Given that the need for energy input must arise before we are driven to redress that need what effects does this have on the theory of evolution? If we run this theory backwards to the point where life began it might be seen from the above argument that there was a none living lump of matter that was in need of redressing a deficiency of energy to maintain it's existence. In doing so a process was started that we call life.