There's no exercise in P.E.
The more your parents force you to "eat right" the more obese you get - I can't find the link again but will hunt on request.
You can eat almost nothing but Big Macs and soda and be healthy.
Viruses might be at least partly responsible for obesity. One thing interesting is how quickly the paediatrician dismisses the study and gets back on the no-TV, soda, active lifestyle message. If it was going the other way, she'd not likely be criticising the small sample size.
Simple result. Obesity = Input Food - Output Exercise. It does not matter if you eat only Cheetos and Coke, or you eat organic food, if you exercise 400 minutes a day or 0. What matters is that you have equal amounts. You naturally have circuits that cause you to eat the right amount and to exercise the right amount. The problem is that parents force their children to eat whole plates of food at specified times, so they get more energy than they need. Next, parents and schools don't let them run around and fidget enough, so they don't get enough exercise. My parents, being wonderful that they are, did not do either. The result is that I eat maybe half as much as the average American, don't really exercise, but am not obese. I exercise not on a schedule, but when my body says so. I eat when I hungry - so I go to dinner at some random time, eat lunch randomly, snack, etc. A lot of energy is used to make food, and because I eat less, I'm green as a result
Diet and exercise is like bleeding with leeches. Just today, I heard that a program was in place for diet and exercise to mitigate neuropathy, and virtually everything under the sun. Diet and exercise won't cure obesity, like it won't cure stomach ulcers, which are now known bacterial. The problem with diet and exercise is that if it fails, well obviously the answer is just more diet and exercise. Plus, it allows one to blame the patient if it fails, and to create a whole subculture of people who hate and discriminate against sick people. The fix for obesity will be to find a pill or other mod that lowers peoples' overfeeding tolerance. Then obesity will be gone for good. Or maybe we can just implant a fuel cell to eat up all the excess blood sugar. Either way, it's in the hands of bioengineers and scientists, not P.E teachers and the First Lady.