Protein is the nutrient crucial for muscle growth. It is made up of amino acids, which serve as the building blocks for muscles and tissues in the body. Consuming adequate protein helps repair and build muscle fibers that are broken down during exercise, especially in strength training. Additionally, proteins play a pivotal role in various bodily functions, including hormone production and immune response. Sources of protein include meat, fish, eggs, dairy products, legumes, nuts, and seeds. For those engaged in regular physical activity or looking to build muscle, ensuring a protein-rich diet is vital for achieving optimal results.