Anybody out there have a problem with sugar free candies?

I am starting to remove carbohydrates from my diet and in my search for sugar-free candies that actually taste good, found sugar free Gummi Bears. Despite negative information on the Net, I find I have no problem eating enough of these to satisfy my sweet tooth. My wife, however, suffered terribly after eating far fewer than I. The sweetener in these bears is Malitol. Has any of the collective had experience with Malitol positive or negative. Is sensitivity to this sweetener something that can be worked up to or do I just naturally have a resistance to the bad effects?