Health Dialogues -- Junk Food

It's been a year since California's first-in-the-nation bans on soda and junk food have been phasing in on school campuses. Combating childhood obesity with these prohibitions is proving harder than advocates thought. But how well have the bans worked? Los Angeles was the first district in the state to go soda and junk food-free and provides a glimpse of the challenges other school districts will likely face. Reporter: Sarah Varney