the whopper. right? >> there he is! top gun. >> reporter: wrong. >> good to see you, brother. >> reporter: bucking the status quo with science and common sense, dan has blue zoned the entire states of iowa and hawaii. 45 american cities. including one of the biggest and unhealthiest in the land. >> when i ask for a blue zone in the united states and you told me fort worth, texas. i thought you were pulling my leg. >> when my kids were in high school, i watched their friends just getting more and more out of shape. and that's happening to our whole population. particularly in texas, land of chicken fried steak, barbecue and mexican food. >> reporter: when mayor betsy price realized her city full of csedentary and obese smokers ranked near the bottom of national wellness surveys, she started holding rolling town halls. and then she brought in dan and blue zones. >> and the response from the room, all the leaders up on the 15th floor of the fort worth club, was i don't know, it