Dark chocolate cannot have more sugar than 100% minus how much cacao is inside. And usually if we're talking dark chocolate then we're talking 60%+ chocolate. My personal suggestion is to go for nothing less than 80-85% chocolate, which certainly does not trigger my sugar addiction (meaning it suffices to eat one or two pieces); even more it appears to reduce my appetite (similar to tea). And also makes me feel happy (there are articles about these effects, but I don't know how good the studies behind it are, but certainly worth a mention!). Truly a gift.