If they are on the Induction List of foods in your copy of Dr. Atkins New Diet Revolution book, then Yes.

But they aren't. So the answer is really NO. I know that even the atkins site says that 1 "meal replacement bar" per day is OK but those bars have stalled many an LCer. And the candy bars are even less acceptable. (Both have sugar alcohols. Click on the words "Low Carb Tips" in the orange bar at the top of this page & look for the article on Sugar Alcohols.)

Induction is only 2 weeks. Why not leave the bars (of all kinds) until at least the 3rd week and lose the most you can by sticking to the plan.