I'm not interested in football <a href=" http://www.lukelab.com/graphs#procession ">celexa makes me feel like a zombie</a> Still, the North American soda market remains crucial for Coke, Pepsi and Dr Pepper. Their executives have steadfastly expressed optimism that a yet-to-be developed soda made with a natural, low-calorie sweetener can help turn around the soda slide.