What are proteins primarily used for in the body?

Proteins play a crucial role in the body, particularly in building and repairing muscles. This is fundamental because muscles are primarily made of proteins, and the body constantly undergoes wear and tear that requires repair and growth, especially after physical activities such as martial arts training. When engaging in vigorous exercise, muscle fibers can suffer small tears, and proteins help to repair these fibers, leading to muscle growth and improved strength over time.

While proteins serve other important functions, such as transporting nutrients and maintaining fluid balance, their primary role in the context of physical activity and overall muscle health is centered around repair and growth. Generating energy, while technically possible since proteins can be converted into energy when carbohydrate sources are low, is not their primary function in the body. Thus, the emphasis on muscle building and repair aligns well with the context of physical training and the goals of martial arts practice.