How many calories are burned during an Iron Man triathlon?

The number of calories burned during an Ironman triathlon can vary significantly based on factors such as a participant's weight, fitness level, and race conditions, but on average, competitors can burn between 8,000 to 15,000 calories throughout the event. This is due to the extensive physical demands of completing a 2.4-mile swim, a 112-mile bike ride, and a 26.2-mile run. Individual calorie expenditure may differ, so it's essential for athletes to fuel adequately before and during the race to maintain energy levels.