Protein plays a critical role in a balanced diet, serving as a building block for muscles, tissues, and hormones. It aids in muscle repair and growth, particularly after exercise, while also supporting immune function and enzyme production. Proper protein intake can help maintain a healthier body composition by promoting feelings of fullness and stabilizing blood sugar levels. Active individuals, such as athletes, have increased protein requirements to support their training and recovery needs, emphasizing the importance of including sufficient sources of protein in daily meals.