We've seen it on the news, the covers of best-selling novels and even on the big screen. Americans are getting bigger and more unhealthy day by day. Over a third of American adults are considered obese, and it's estimated that up to one in three adults will suffer from diabetes by the year 2050. (In 2010, it affected one in 10 U.S. adults.) And many of these problems have been blamed on things like fast food, super-sized portions and high levels of sugar in the foods available on store shelves.
So just what has to be done to turn this doom-train around? Maybe it's eating more local produce? Or improving school lunches? Or campaigning for better regulations in the food industry? Whatever ends up being the answer, here are our 15 favorite health heroes who have devoted themselves to improving America's relationship with food.