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Carbohydrates are crucial for fatigue management in athletes because they serve as the primary source of energy for high-intensity exercise and sustained physical activity. When athletes engage in prolonged or strenuous activities, their bodies rely on glycogen stores, which are derived from carbohydrates. Adequate carbohydrate intake helps maintain blood glucose levels, supports optimal performance, and delays fatigue onset.

During exercise, particularly at moderate to high intensities, the body metabolizes carbohydrates more quickly than fats or proteins, making them the preferred energy source. When carbohydrate stores are depleted, athletes may experience reduced performance, increased perception of effort, and an overall decline in endurance. Thus, having sufficient carbohydrates in the diet not only aids in quick energy replenishment but also enhances recovery and reduces fatigue during subsequent training sessions.

While fats, proteins, and vitamins play vital roles in an athlete's overall nutrition and health, they are not as immediately effective in managing fatigue as carbohydrates are. Fats serve as a source of energy during lower-intensity activities, proteins are essential for muscle repair and growth, and vitamins support various metabolic functions, but they do not directly influence energy levels in the same way carbohydrates do during physical exertion.