A Monday, June 11, 2012, photo shows bottles of Pepsi Next and Pepsi Max displayed amongst cans of ten-calorie sodas from PepsiCo. in New York. Coke and Pepsi are chasing after the sweet spot: a soda with no calories, no artificial sweeteners and no funny aftertaste. The world's top soft drink companies hope that's the elusive trifecta that will silence health concerns about soda and reverse the decline in consumption of carbonated drinks. But coming up with such a formula could still be years away. (AP Photo/Mark Lennihan)