Protein metabolism refers to the process by which the body breaks down proteins into their building blocks, called amino acids. This process occurs primarily in the stomach and small intestine, where enzymes and acids help digest dietary proteins. Once broken down, amino acids are absorbed into the bloodstream and transported to cells for various functions. In the cells, amino acids can be used to build new proteins needed for growth, repair, and maintenance of tissues. Additionally, they can be converted into energy or transformed into other compounds, depending on the body's needs. This intricate balance is essential for overall health and well-being.