Commercial chocolate is not good for you. It contains caffeine, sugar and milk products.
The best way to enjoy chocolate is to have it raw and sweetened with stevia or agave syrup.
It is healthy for you and non-fattening if taken this way. There are plenty of free-trade places to get raw chocolate and I think it tastes better when it's not hampered by the commericialized Hershey or other industries.

Frank Hamilton