Here is a great TED talk by Dan Buettner describing 9 diet and lifestyle habits associated with much better health and longer lives.
Getting Americans to adopt these habits could lead to dramatically lower health costs. And fortunately these habits are not expensive - to the contrary, certain things like increasing walking rather than driving would directly save people money.
Making these changes would help stem run-away health care costs for society as a whole, which is a concern for nearly everyone - regardless of where they are on the political spectrum. So what's the problem? The problem is that changing behavior is tough - even when people know it is in their own interest.
Nonetheless, even modest investments in getting the word out could have big returns. So pass the word.