Just a lack of exercise alone doesn't cause young kids to be a type 2 diabetic or obese. Lack of exercise is a factor but the diet changed with the advent of the food guide pyramid. Fat became anathema and carbohydrates were the healthiest foods you could eat, so they said. The food companies took out the fat and added HFCS to *everything* to add back flavor and volume.
The thing is a constant consumption of HFCS causes the pancreas to continuously release insulin and insulin is a fat storing hormone.
I will give you an example from my family about simply changing diet can control the insulin spikes and assist with weight loss. My brother's blood sugar spiked to over 550 and nothing was bringing it down. I told him to give strict Atkins induction a chance and he did because he did not want to be hospitalized. Within two weeks his blood sugar levels were in the normal range, and he's lost almost sixty pounds in the last 3 months.
I know many many other diabetics who have gotten their blood sugar levels back to normal by getting off of refined carbs, primarily HFCS and white flour, and they are losing weight in the process. There is a correlation to the rapid rise in obesity with the use of the food guide pyramid and the massive use of HFCS.
http://www.msnbc.msn.com/id/4808249/
http://www.iotf.org/media/syrup.htm
http://www.washingtonpost.com/ac2/wp-dyn/A8003-2003Mar10?language=printer
http://www.diabetic-help.com/study_blames_corn_syrup_for_rise.htm
I seem to recall that Snapple originally had sugar in it, but the taste changed when they switched to HFCS. Same with Coca-Cola. Although with Coke, at certain times of the year, if you really look for it, you can find "Kosher for Passover" Coke that has sugar, rather than HFCS, and it really does taste better.
Mark
But that doesn't apply to those in this article ---- they've never likely heard of it. Their diet likely hasn't changed much but the life of welfare just means a whole lot more food and no exercise. Parents teach by example --- if they are just planted in front of a television watching novelas all day long that's what the kids think is normal.