Plinky asked me if I could enact one new law what would it be? My answer is to regulate food choices for children in order to prevent childhood obesity.

A very interesting Los Angeles Times article states that there's a new ordinance to only provide toys with children's meals if they have fruit instead of fries, scheduled to take effect December 2011.
I think this is an important strive to decrease the likelihood of childhood obesity. Not to get on a soapbox, but there are several possible negative outcomes that come with obesity. As stated in the article linked above, cardiovascular disease, bone and joint problems, as well as adulthood type 2 diabetes can be attributed to childhood obesity.
I think if we use the positive reinforcement, as described in this virtual psychology classroom, we will increase the likelihood that children well make their own choices-to eat healthier.
Now, if only we had a positive reinforcer we could use for adults to deter their decision for the fries in the fast food line... hmmm if only adults got toys with their grown-up meal! :) I'd be a hypocrite if I said I always chose the healthy road. I'm just saying, we need to mold our children (the future of our world) into a healthier way of thinking than what is acceptable today. Regulating what their fast food intake be would help parents steer their children toward healthy choices.