In addition to the possible laxative effect, you also have to be careful to read ingredients so you can avoid trans-fats. Some of the brands and flavors have them, some don't. Carbolite dark chocolate, and Hershey SF chocolate and dark chocolate don't have trans fats, whereas Hershey PB and all of the Russell Stover flavors do. (None of the Atkins Endulge have transfats, either).