What is the answer to childhood obesity?

On the news today, it was reported that 10 yr old children's arteries being like a 45 yr old due to obesity. Inactivity of children and improper eating plus computers are not going away. Kids are online more than ever too much of the time with less physical activity. Parents both working with kids having to fin for themselves much of the time when it comes to meals or snacks. This subject has so many sides to address. Are we going back to a society that the longevity of our citizens will revert back to people dying in the 40s and 50s due to strokes and heart disease if this keeps up with our youth? Who's at fault? Parents not setting better examples? Fast Food Chains? Less exercise in school programs? Children are at risk, how can we control this quite shocking fact that are kids are in such terrible physical condition? Moderation in all things is my motto, but this is so out of control with our youth. What points and plausible answer can you share over this dilemma?