Why is it necessary to break down proteins in the digestive system?

Enzymes break down proteins in the digestive system, unless I'm mistaken.

I am not sure what you mean....? Your body breaks down food for energy. This will come in the form of fats, proteins, and carbs. Proteins are the building blocks of pretty much everything.

Your body breaks it down to supply ongoing processes, like hair growth, nail growth, muscle growth, etc.

You need to break down protein you take in foods during digestion so that you can absorb the amino acids contained by the protein. Protein molecules are big and can not be absorbed unless it is already digested into smaller peptides and amino acids. The resulting amino acids are absorbed from the digestive tract, enter the body and then utilised to make protein in the body.

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