I can't believe the comments. Unfortunately, this is true; at least in part.
When there is a huge trend like obesity, one simply must look at what has changed.
I realize most of you are not my age (forty-six) so let me elaborate.
When I was a kid, we had McDonalds. I grew up in North Texas, and most of the food my mom made was fried with gravy. Thursday was chicken-fried steak day at school; Friday was fish--also fried. There was no "low fat" anything. These things did not exist. You put a cup of sugar into Kool-aid to sweeten it. We got diet soda finally in high school. It was called "Tab" and I started drinking it, not because of calorie concerns, but because I discovered that if I spilled it, everything didn't get sticky.
However, despite all of these extremely poor diet choices FORCED on us by our ignorance, I don't remember any "fat kids." Really. I'm sure there were some, but I honestly don't remember any kid being so overweight as to be called "fat." Overweight, certainly, but "fat" or "obese", no.
So why, despite all our newfound knowledge and expertise in diet, is there this explosion in obesity? The answer lies in what has changed.
What has changed is the incredible amount of screen time kids get today. When I was a kid, there wasn't 24 hour programming for kids. There was Saturday morning. Once a year, we got Charlie Brown Xmas and Rudolph. Once a year "The Wizard of Oz" came on. Woe to you if you missed them because it was 12 months before you'd get another chance. Now kids have probably 10 channels offering programming 24 hours a day. Now throw in video games and computers, and you've got a pretty hefty amount of butt-sitting going on.
A second factor is general laziness and parent paranoia or inability to say no. We walked or rode our bikes if we wanted to go to a friend's house. Now, kids are either too lazy (OMG--it's like a mile!) and parents give in to driving Chad four blocks, or the parents are too paranoid their kids are going to be snatched by a stranger to allow them to walk the four blocks.
People will always look for solutions that call for other people to change. So they point the finger at food rather than the real culprit, screen time, which would require actual effort to control. You can laugh at the McDonalds guy all you want, but remember as you're doing so you're sitting on butt in front of a screen.
Oh, BTW, if you ARE an "active kid" in a myriad of activities, my bet is that suddenly there's no time for Mom to cook a real meal, so you're pulling through the Micky D's drive through at least once a week. When I was a kid, McDonalds was a treat, not a regular meal. But I guess that's their fault too, right?