This is something even Coca-Cola can agree is a bad idea. The company is in the middle of a roll-out of smaller, portion-controlled sizes of its most popular drinks, and promises to have them in about 90% of the country by the end of the year.

"We've never been more committed to doing our part to help address the issue of obesity," Coca-Cola spokesman Ben Scheidler said in an e-mail, adding that "2013 is going to be a landmark year in terms of expanding partnerships and efforts to educate consumers about energy balance."

But perhaps most important is a move Coca-Cola has already made: the decision to add the calorie counts to the front of their bottles and cans, to make it even easier for consumers to make informed decisions.