The few people I've known that would drink that much daily drink diet only. It has been pretty obvious throughout my life that people who have no self-control are more likely to go for things like diet sodas and "lite" whatever. I hate sweeteners, I can't stand diet anything both because it tastes bad to me and it makes me feel ill, but to me it still seems like it would be easier to drink 12 cans of diet soda than the same amount of "normal" soda. It's a disgusting amount either way.