Too much sugarless gum
If you consume too much sorbitol, which is found in some sugar-free products, it can cause pain and diarrhea. According to a 2008 article in BMJ, a 21-year-old woman had an 11-pound weight loss, abdominal pain, and diarrhea (as many as 12 bowel movements a day) from chewing about 16 sticks of gum a day.