A child's parents influence their behavior much more than any school system, coach, or society.  Therefore, these parents are the ones responsible for their children's ill health and our unhealthy world of the future. 

Unhealthy diets, not enough exercise, and too much television ... it's all leading to an increased number of children suffering chronic conditions like diabetes and asthma. The whole country will feel the strain, as the health problems stretch health care and social welfare systems, according to Harvard researchers...

..."It seems to us if we're going to try to make some real changes in this, it's going to have to be prevention," Dr. Perrin said. The most promising ways to do this are "to change children's diets, improve their exercise and activities, and to limit their exposure to media, especially without adult supervision."

What bugs me is they are zeroing in on the kids: "change children's diets...exercise...activities...limit their exposure to media..." when clearly it is the parents' influence (or lack there of) that's the culprit. 

Children naturally emulate their parents, we need to change the parents and what foods they bring into the home, what activities are part of their lives, and limiting television should be a major part of this equation.