The nutrient that is vital for building and repairing body tissues is protein. Proteins are made up of amino acids, which are the building blocks of cells and tissues. They play a critical role in various bodily functions, including muscle growth, immune response, hormone production, and enzyme function. Dietary sources of protein include meat, fish, dairy products, legumes, nuts, and seeds. For individuals engaging in physical activity or recovering from injury, adequate protein intake is especially important to support muscle repair and overall health. Recommendations suggest incorporating a variety of protein sources in a balanced diet.