Caffeine stimulates the nervous system and clears your thoughts -- but it also stimulates and clears the G.I. tract. Many people report excess caffeine results in frequent bowel movements or loose stools within an hour of ingestion. Those with Crohn's disease or irritable bowel syndrome find limiting caffeine can help ease symptoms of their condition. However, if you have a hard time producing bowel movements or experience constipation, a cup of coffee might help you get moving.

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