Now since i'm at heart a problem solver... how do you solve food problems?
1) Stop subsidizing junk food. Why does everything in the USA have high fructose corn syrup? Corn subsidies. That's why most other places use sugar in their soda.
http://grist.org/article/food-2010-09-21-op-ed-corn-subsidies-make-unhealthy-food-choices/
If you want to go further and want to get government all up in it... how about making healthier food cheaper? Give subsidies for fresh grown foods designated for local sale. If you got rid of the corn subsidy and focused it on healthier fruits and vegetables that can't be used for things like corn syrup you would make healthier food cheaper for people to eat in a completely revenue neutral way.
2) Target the fringes. You don't go into the fattest town in America and say "Change now, you idiots who are killing your kids" like Jamie Oliver. That's only going to further entrench people. You focus in areas where people are eating healthy, or at least eating less awful, you start with them and increase healthy eating in the areas of least resistance. This will change the culture of eating, and what's in style... and "loosen" up the tougher areas, making some people eat healthier due to it being in style and most the country doing it. Eventually isolated the worst areas change.
3) Target minorities. Some grants to black and Hispanic chefs to make healthier versions of the foods they eat couldn't hurt.
4) Have a helpful website. One like the Livestrong website for example... which is a great tool. Just expand something like that to include nutrition.
Also have sample "healthy" food schedules. With cheap and easy to make recipes. Furthermore, make said schedules REALISTIC. Throw in the occasionally unhealthy thing or just make outright calories dedicated to junk food and places like McDonald's.
5) Specifically offer federal school funding for a home economics classes that teach healthy food that students might like. Then if you convert them, they can actually eat healthy.
6) Restrict food stamps to non-processed food. Then people who need foodstamps to eat actually have to change their culture at home.
