List the Calories, don't ban the drinks

One final thought about Bloomberg's New York law banning huge sodas.  I think the most persuasive thing he can do would be to list the calories of the drinks, on the cups or on the menu boards in the establishments, prominently and easily seen.  Banning them is government coercion, which I don't like.  But showing the calories is education, and will have an effect, probably more of an effect than the other.