This is the digestion process.
During a chemical reaction, energy gets used to break the existing bonds in order to create new bonds.
Any chemical reaction need an activation energy.
They are organic catalysts. All catalysts will speed up a reaction by lowering the activation energy of the reaction, or the energy required to break certain atoms apart so that they can be reformed to make new products.
The energy required to break a chemical bond and form neutral isolated atoms is called bond energy.
bond energy
Activation energy is needed to start a chemical reaction. This energy is used to join the reactants together or break them apart. If a reaction is exothermic then it gives energy out. If it is endo thermic then the reaction takes energy in.
It will as the energy required to break the bonds is more than the energy required to make the new bonds.
Metabolism
The answer is really METABOLISM :)
Metabolism!
Metabolism
Energy is the key for any reaction to take place. To break the bonds of a substance, a fixed amount of energy is required which is called bond energy. For some substances the bond energy is low and they do not require external energy and start reaction on their on there own whereas for some substances we have to provide external energy for the reaction to take place.