Still --- my kids go to the same kinds of schools mentioned in the article --- they're served the same fattening "ethnic" foods (politically correct meals), they play their share of video games --- but they aren't obese --- nor are the more active Mexican kids. What you run across in this area --- the food being consumed is the same for everyone --- the guys out baling hay aren't obese but the housing project dwellers almost all are. Everyone eats the fat and carbohydrate laded tamales and burritos --- but not everyone is fat. Some people replace the lard with small amounts of vegetable oil --- which kills the flavor but they seem to be slimmer. To me that's like eating popcorn without the butter.
I agree that there needs to be more activity as part of the solution. Perhaps if people had to exchange community service for benefits there would be less of a problem in this area.
I do know in my family that several of us have benefitted from making concious dietary changes and the biggest one was simply going back to eating real foods. It takes a little bit more time but the effort is worth it.
Hispanic people aren't uniform, either - some have more Spanish, some have more Indian, some are a mix of Spanish-Anglo-Indian