Protein is the most important nutrient for muscle growth. It provides the essential amino acids that the body needs to repair and build muscle tissue after exercise. Consuming adequate amounts of protein helps stimulate muscle protein synthesis, which is crucial for recovery and muscle hypertrophy. Athletes and individuals engaged in strength training typically require more protein than the average person. Sources of protein vary and include meat, fish, eggs, dairy, legumes, and plant-based proteins. Balancing protein intake with carbohydrates and fats is also important to support overall energy levels and performance in physical activities.