How is food used to produce energy in our cells?  

  The below video helps break down the way we take food, after digestive breakdown, and convert it to ATP, adenosine triphosphate.  The importance of using electrons in the electron transport chain to couple with oxygen creating the tri bond of phosphate is the process of energy creation.   The role of energy creation is to minimize the existence of free radicals in our body which is often a precursor to many diseases and stabilize existing atoms so they are grounded.  The energy substance of ATP is simply the addition of one phosphate to the existing ADP, adenosine diphosphate or take 2 phosphate molecules, add one more and now we have 3 phosphates or ATP.  It is the third phosphate molecule created in the mitochondria that enables energy for cellular function.