The essential nutrient for building and repairing tissues is protein. Protein is composed of amino acids, which are the building blocks for muscle repair and growth, particularly after exercise. Adequate protein intake supports recovery from injury and contributes to overall muscle health. It also plays a critical role in hormone and enzyme production, immune function, and maintaining fluid balance in the body. Including high-quality protein sources in the diet, such as meats, fish, legumes, and dairy, is key for anyone looking to enhance tissue growth and maintenance.