Why are Younger Children Alone in Reducing Obesity Rates?

The Centers for Disease Control is reporting progress in cutting obesity among pre-schoolers. During the past decade, obesity in children aged 2 to 5 has dropped from 14 percent to 8 percent. Christina Economos of the Tufts University School of Medicine joins Gwen Ifill to discuss possible factors in the decrease, including changes to food assistance programs and nutrition and exercise campaigns.