As any endurance athlete knows, prolonged periods of intense exercise can cause more than muscle fatigue. "When you start to exercise, the blood is flowing to the muscles that are working, and less blood going to your stomach that can help digest your food," Rumsey explains. "So if you've eaten recently and the food isn't really digested, it could cause stomach discomfort and diarrhea."
The best fix is to avoid high-fiber roughage such as broccoli in the hours before an endurance event. Rumsey recommends easily digestible carbs, such as bread with peanut butter, bananas, or cereal with milk, before a long run and experimenting until you find a food combination that works for your stomach.
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