I recommend that you discuss this question with your doctor
. Sorbitol is a sugar alcohol that is used as a sugar substitute in many of the foods you describe. The quantities in these foods is usually low, and most people tolerate them without side effects. Sorbitol does have laxative effects: specifically, sorbitol does not get broken down in the small intestine, and causes water to be retained. In some people this can cause diarrhea, flatulence (gas) and abdominal pain
, and for people with irritable bowel it can aggravate their symptoms. In terms of the amount that can cause symptoms, 5-20 grams can cause abdominal pain, bloating and gas, and greater amounts (20-50g) can cause diarrhea. Sorbitol in contact solution, toothpaste and mouthwash is unlikely to be absorbed in significant quantities unless you're swallowing them, but you are likely taking in the sorbitol in chewing gum and vitamins. If you are having a lot of GI symptoms and feel you are taking in more than 5g of sorbitol per day, it may be contributing, and I would recommend you avoid chewing gum and foods that contain artificial sweetener. That being said, if you are having serious GI symptoms including persistent diarrhea, abdominal pain, any red or black/tarry bowel movements, nausea and vomiting, or weight loss
, it is really important that you see your doctor to discuss these symptoms.