We already know this, certainly, and we also know that poverty and obesity are very clearly linked. These researchers are just looking at the issue again, and clarifying it and making it scientific.
You're not going to be able to find one thing that is going to be the be-all and end-all in obesity in kids. I don't think any one thing is going to have a strong effect, but if we don't start to do some of these things now, we don't have a chance in hell of reducing obesity.
Childhood obesity is a huge systemic problem. It's a pandemic to a certain extent.