Final answer:
During intense exercise, an athlete should consume a carbohydrate-rich snack every 15-20 minutes to fully refuel and sustain blood glucose levels.
Step-by-step explanation:
The athlete should consume a carbohydrate-rich snack every 15-20 minutes during intense exercise to fully refuel and sustain blood glucose levels. Carbohydrates are an important fuel source for the brain and muscles during exercise, and consuming them regularly helps maintain energy levels. Sports drinks, which contain carbohydrates and electrolytes, are also recommended to rehydrate the body and replenish electrolyte levels after excessive fluid depletion.