Common nutritional deficiencies among athletes often include iron, calcium, and vitamin D. Given their heightened physical demands, athletes may require more of these nutrients to support energy levels, muscle recovery, and overall performance. For instance, iron deficiency can lead to anemia, resulting in fatigue and decreased performance. Adequate intake of calcium and vitamin D is vital for maintaining strong bones and preventing injuries. Athletes should focus on a balanced diet rich in whole foods and consider supplementation where necessary.