There are 2 types of substance in the bars that lead to tricky accounting. The malitol is a sugar alcohol that the body has a hard time digesting, one of the reasons thhat overindulging in the will lead to gastro-intestinal upset and a lot of bathroom time.
For some minority of people, like me, the sugar alcohol can cause a release of insulin.
The other substance is glycerine, some people will also have a blood sugar reation for this stuff. I have problems with eating the bars and such things, so I avoid them. If they don't cause you a carb reatioin or stalls, you can probably eat them moderately without a problem. They are still basically a junk food and shouldn't become more than a treat for that reason. Your mileage may vary, you need to find out what works, or doesn't work, on you. Nyah Levi