Protein is the most important nutrient for building muscle. It plays a crucial role in muscle repair, growth, and maintenance following exercise, especially strength training and resistance activities. Consuming adequate amounts of protein helps stimulate muscle protein synthesis, which is vital for muscle recovery and adaptation. Good sources of protein include meats, poultry, fish, dairy products, legumes, nuts, and seeds. For optimal muscle growth, it is often recommended to consume protein in conjunction with carbohydrates, especially after workouts, to support recovery and energy replenishment.