This really goes back to what I was saying the other day. If the price of fresh fruits and veggies was lower, it might make a big difference. Plus you have families where both parents work one or more jobs just to meet their ends and child care is out of the question due to the high cost. The kids sit at home and aren't very active with nothing to do but be baby sat by the TV and food. It's a vicious cycle.
It definitely is a vicious cycle. I don't know if there is a single answer for it (without being draconian), but I do think that almost nothing is being done to tackle the problem. It is the ultimate, kick the can approach.