But food is more than fuel, noted Supatra Tovar, a clinical psychologist, registered dietitian and fitness expert. She said: “It directly affects physiology, mental clarity, emotional regulation and overall safety. These events place enormous stress on the body through long hours of sustained effort, elevated stress hormones, fluid and electrolyte loss, gastrointestinal strain and nervous system fatigue. What you eat and drink can determine whether you finish strong, struggle through the final miles, or end up injured or unwell.”
Article source: https://www.huffingtonpost.co.uk/entry/ultra-endurance-athlete-diet-calories_uk_698da436e4b0ba740458c343