Regulating soft drink size

Cambridge is considering banning the sale of soft drinks bigger than 16 oz in restaurants, movie theaters, etc.

I'm not really in favor of this, but not because it "restricts liberty." Sometimes, for my own good, the government should step in and try to "facilitate" better choices. That might include not drinking so much soda.

But before the mayor help me out I'd like to see some studies showing lots of people want to quit drinking so much soda but can't help it or that drinking less soda is associated with being happier. It's a good idea to start with the prior that the mayor doesn't know best and then consider the evidence to the contrary.

Also, when I go to the AMC theater in Harvard Sq. I get the large size soda to share with my girlfriend. It's probably 32 oz so it'd be banned even though at 16 oz/person it's not the intended target. I'd probably just always go to the AMC theater in Boston so it's not a big deal.

My final objection would be that I drank a 64 oz Double Gulp at 7-Eleven in college, so did my girlfriend, and I think most people should as a coming-of-age right. But they downsized the cup to 50z so it's not the same.