Sorbitol is a sugar alcohol that is commonly used as a sweetener in a variety of food products. It has come to the attention of researchers recently that the sorbitol found in chewing gum can cause chronic diarrhea. This chronic diarrhea can lead to unintentional weight loss and other health issues. I haven't found the study but the news article says enough.
There is an extensive use of additives in food. Obviously, we don't know the impact of all of them. Another reason to read the labels on everything. Unfortunately, in an image obsessed society somebody will likely promote the possible weight loss with sorbitol and sell more of it. A new twist on on "nutriceuticals". We'll all be spending more time reading the labels than eating or cooking by the looks of it.