What type of energy is associated with food? how is that energy stored? how does food energy change when it is used to do work? (site 1)

What type of energy is associated with food?

The energy that food has is called chemical energy, it provides us with the energy to move and talk.

How does food energy change when it is used to do work?  

The food that you chew has, stored chemical energy, that is processed in the digestive system by enzymes. The enzymes breakdown the molecules into, fat and sugar molecules and into adenosine triphosphate (ATP).The ATP molecule is the energy source, which converts into adenosine diphosphate (ADP) molecule. ADP, is responsible for supplying the energy to living cells in order to do work