Which macronutrient is essential for muscle repair?

Protein is essential for muscle repair due to its role as the primary building block of muscle tissue. After physical activity, particularly resistance training or intense exercise, muscle fibers undergo micro-tears. The body uses protein to repair these tears, leading to muscle growth and recovery.

Proteins are made up of amino acids, which are necessary for the synthesis of new muscle tissue. Certain amino acids, known as essential amino acids, cannot be synthesized by the body and must be obtained through dietary sources. Among these, leucine, found in protein-rich foods, plays a particularly crucial role in stimulating muscle protein synthesis.

While carbohydrates and fats also play important roles in an athlete's diet—providing energy and supporting overall health—neither of those macronutrients is specifically important for muscle repair. Fiber is primarily known for its benefits in digestive health and does not directly contribute to muscle repair or growth. Therefore, protein is the macronutrient that is most directly linked to the recovery and rebuilding of muscle tissue after exercise.