naked chef jamie oliver believes he is transform the unhealthiest city in america, and "nightline" iss to do it. >>> how to build the perfect pop star. from cute youtube hit to international music sensation. we're all access with 16-year-old justin bieber to find out what your kids are screaming about. >>> plus, blessing and a curse? sandra bullock blindsided by a cheating husband. her oscar glory turned to marital heartache. but she's hardly alone. why the so-called best actress curse is a "signf the times." >> announcer: from the global resources of abc news, with terry moran, martin bashir and cynthia mcfadden in new york city, this is "nightline," march 19th, 2010. >> good evening. it's the end of another week, and like millions of americans, you've probably started to relax with some highly processed fast convenience food. many take the junk food option because they say it's cheap and easier to prepare. but according to some experts, that approach has led to an obesity and public health crisis. so, is it possible to change our fast food habits? well, one celebrity chef is on a cr

. >> larry: tonight, ryan seacrest and jamie oliver, taking aim at the unhealthiest city in america. >> i'm here to start a revolution, a food revolution. >> larry: waging a war on fat, hoping to shape up an entire town a kid at a time like it or not. >> how's your pizza for breakfast? >> larry: ryan knows what he's talking about. he was fat -- >> wouldn't say i was obese but i was embarrassed as a teenager. >> larry: really? next on "larry king live." >> larry: ryan seacrest is here. he's executive producer of "jamie oliver's food revolution." the man on the front lines of the food revolution, jamie oliver from new york. he's the superstar and best-selling cookbook author. the two-hour premiere of "jamie oliver's food revolution" airs friday, tomorrow night on abc. how did this come about, ryan? >> two reasons, one, we know childhood obesity is a major issue in our country. and number two, superstar there, jamie oliver. he's done this in the uk. he's gotten on the front lines of the uk school system. he's recognized there was a real problem in the cafeterias and he made significant

it's set in huntington, west virginia, also known as america's unhealthiest city.t's called "jamie oliver's food revolution." jamie joins me right now talk about it. good to have you here. >> hello, madam. >> why west virginia? >> first of all, there is no date that that says any town is the most unhealthy. but we did go to the tri-state area and in that area the biggest metropolitan area was huntington. we really wanted to go to the eye of the storm of the government statistics, the cdc report for disease. and without question, you know, this area has suffered greatly over the last number of years for all the kind of big hitters -- heart disease, diabetes, obesity, et cetera, et cetera. so that's kind of where i set up camp, really. and my job was really to understand the problem, try and fix it, and see what needed to be done. and try and become to a part of the community really. >> it's a nationwide problem. >> that's an interesting thing. >> what is it about us, though, as americans? >> it's not just you. i come from england and we've got the same problems. eng