Which nutrient is primarily responsible for muscle repair?

Protein is primarily responsible for muscle repair due to its crucial role in the body's recovery and growth processes. When muscle tissue is damaged from exercise or injury, protein provides the necessary amino acids that serve as building blocks for new muscle fibers. This process, known as muscle protein synthesis, helps to repair and build muscle tissues, ultimately enhancing recovery and promoting strength gains.

Proteins are made up of amino acids, which are essential for various bodily functions, including the synthesis of enzymes and hormones, as well as supporting immune function. During periods of muscle stress, such as intense physical activity, the demand for protein increases to facilitate efficient repair processes.

In contrast, carbohydrates primarily provide energy, especially during high-intensity activities, and fats are an energy source as well, while fiber aids in digestion and does not have a direct role in muscle repair.