Common nutrient deficiencies in athletes often include iron, calcium, vitamin D, and magnesium. Iron is crucial for transporting oxygen during exercise, and its deficiency can lead to fatigue and decreased performance. Calcium and vitamin D support bone health, while magnesium aids in muscle function and recovery. Athletes' increased energy and nutrient demands can make it challenging to meet these requirements through diet alone, making supplementation a consideration for some. Regular nutrition assessments can help athletes maintain optimal performance and overall health.