Fiber is critical for digestive health, helping regulate bowel movements, manage blood sugar levels, and support heart health. However, fiber plays no direct role in muscle repair. It does not contain amino acids, which are the building blocks your body needs to repair and grow muscle tissue. While a high-fiber diet contributes to overall well-being, including improved digestion and satiety, it won’t support the recovery of muscles damaged during exercise. That function is the domain of protein. For muscle repair and growth, prioritize a balanced diet that includes adequate protein, with fiber playing a complementary, not restorative, role.