How food is rearranged through chemical reactions forming new molecules that support growth and or release energy as this matter moves through an organism?

The food we eat contains complex organic molecules which have to be broken down into simpler molecules by chemical reaction to extract energy from them. For example carbohydrate like glycogen is broken down into glucose by some enzymes like Glycogen phosphorylase.

Then this new simpler molecules are absorbed in the body through intestine. The glucose reaches the cell where by aerobic respiration it gets oxidized into CO2 and in this process, energy molecules are formed in the form of ATP which support the growth of cell.