People are always saying that if you swallow gum it can take up t so many years to pass through your digestive tract and I was wondering, is that because as gum it sticks to the sides of your digestive system? O is it because your digestive acids and enzymes have a tough job breaking it down?

On a camping trip over the weekend we tested how a gummy bear would melt over a campfire. The result was an expanding bubbling effect. What exactly is it in the gummy bears which makes the food bubble up?