Body needs food

Why the body needs food? Have any of you wonder why? Is it because we need to survive?
You may not be aware of it, but many processes are going on in your body all the time, non-stop even when you're sleeping!
For example:

• The heart pumps blood in the body's blood circulation system. 
• The lung makes sure that the carbon dioxide in the body is replaced with oxygen. 
• The brain coordinates metal and physical actions. 

Since there are so many different functions to perform, the body has to be in good condition both internally and externally in order to do its works well. Food plays an important role in keeping the body in working order.