Nutrient deficiency, particularly in essential vitamins and minerals, can severely affect athletic performance. Lacking necessary nutrients might lead to decreased energy levels, impaired recovery, and increased risk of injury. For example, insufficient iron can lead to anemia, causing fatigue and reduced endurance, while a lack of calcium can affect bone health. Nutrient deficiencies can also impair immune function, making athletes more susceptible to illness. Therefore, maintaining a well-balanced diet is crucial for athletes to ensure optimal performance and overall health, supporting their training and competitive efforts.