A common nutritional deficiency among athletes is iron. This trace element is crucial for oxygen transport in the blood, energy levels, and overall endurance. Athletes, especially those engaged in endurance sports, may require higher levels of iron due to increased blood volume and the loss through sweat or injuries. Symptoms of iron deficiency may include fatigue, decreased performance, and impaired recovery. To counteract this, athletes should focus on consuming iron-rich foods like red meat, fish, beans, and leafy greens. For some, iron supplements may be recommended under medical supervision.