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To get energy from food it needs to digested. Enzymes breaks food into simple molecules.in small intestine these particles are absorbed.thus we get energy from food. that is why food needs to be digested
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Disgestion is requires to consume energy from the food we eat. The food needs to be digested for the proper breakdown of macromolecules into small molecules. These molecules are absorbed by the intestimal wall and are carried by the blood  to the body cells. The cells becomes energized as we get energy. And we can perform our normal body functions. So, the food needs to be digested and assimilated by the body.

hope this helps u.. :)))
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