How Nutritional Deficiencies Increase Injury Risk in Runners

A recent systematic review and meta-analysis of nearly 6,000 adult distance runners highlights a critical link between dietary habits and injury prevention. The research indicates that runners who under-consume essential calories, fats, and fiber are significantly more prone to musculoskeletal injuries, particularly bone stress injuries. Notably, the study found that injured female runners consumed 300 to 450 fewer daily calories and approximately 20 grams less fat than their injury-free counterparts, suggesting that even minor caloric deficits can compromise physical resilience.

The implications of these findings are significant for athletes who prioritize performance or body composition goals. When the body is chronically underfueled, it often deprioritizes non-essential physiological processes, such as bone remodeling and hormone production. Fat intake is equally vital, as it facilitates the absorption of essential vitamins and supports the regulation of inflammation. Furthermore, the correlation between lower fiber intake and increased injury risk underscores the growing importance of gut health in systemic recovery, suggesting that a healthy microbiome is essential for managing the physical stress of endurance training.

For those increasing their training volume, this data serves as a vital reminder that nutritional intake must scale alongside physical activity. The study reveals that the margin between injury and resilience is often smaller than expected; modest increases in caloric, fat, and fiber intake can provide the necessary support for tissue repair and hormonal balance. By focusing on nutrient-dense whole foods—such as healthy fats and fiber-rich plants—athletes can better protect their bodies against the long-term consequences of energy deficiency and ensure more sustainable athletic performance.