>>4
Er, I don't think the carbonation makes you chubby. If so, drinking soda water would make you fat. It's the sugars in soft drinks that make you fat.

Also, soft drinks with aspartame don't have enough in it to give you cancer. The lab rats that got cancer from it were given like, half their body weight, and unless you're eating 75-100lbs of pure aspartame a day, you're probably fine.

That said, nothing's better for you than water. :)