The small size for a movie theater soda often starts at about 24oz. Getting less than that is not an option. There's been studies that when you put more food or drink in front of someone, they'll consume, even if they aren't particularly hungry or thirsty. Hence, the inflated soda sizes were adding thousands of extra calories that people otherwise wouldn't have wanted.
Thanks, I didn't think about the massive movie theater tankards. Seems like that could be solved by requiring that they offer a smaller size, rather than requiring that they not offer a larger one.
I've always thought that government could help a lot just by requiring that they sell tap water in cups of the same size as the cups of sugar water, and at cost. As it is, the choice is usually between a thimbleful of water, or a bottled water that is (other than being wasteful, environmentally horrible, and sending money to those same sugar water companies) sometimes more expensive than the soda.
