Proteins are large, complex molecules made up of smaller units called amino acids. They play a crucial role in the body, serving as building blocks for tissues, enzymes, hormones, and other essential substances. Proteins are vital for growth, repair, and overall health, and they can be found in various foods, including meat, dairy, legumes, and nuts. The structure of proteins is determined by the sequence of amino acids, which can vary widely. There are 20 different amino acids, and the specific combination and arrangement of these amino acids dictate a protein's unique function. Proper protein intake is important for maintaining muscle mass and supporting metabolic processes.