Why is protein not changed at different stages of the body’s life?

This is due to the fact that protein is a “building material”. The cells of the body are made of protein. A person must eat protein foods in order to receive the normal development of the body. If you remove from the diet food that is rich in protein, then health will greatly deteriorate. In the digestive system, food is broken down into proteins, lipids, and carbons. Proteins are then broken down into amino acids, which are reassembled into new proteins in various cells of the body. There are twenty amino acids in total that can create thousands of proteins.

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