The show revisits three of last year's feeding clinic inmates - meal dodger Nathan Smith, takeaway king Chris Longley, and convenience queen Jo Palmer. One year on, have they managed to ditch their dreadful diets for good? Plus, it revisits Dr Christian's time in Evansville, Indiana - the US city that topped the polls in 2011 as America's Fattest. At the local Deaconess Hospital, he meets patients suffering the severe effects of obesity, and staff on the front line dealing with the crisis. He also visits Keith Davis from Goliath Caskets, who knows all about the ever expanding population - because he makes the biggest coffins in the United States. Twenty-four stone Chris gorged on up to a dozen takeaways a week. His body was paying a very high price when he checked in to the Feeding clinic. Sharing the diet swap dinner table with Chris was 21-year-old meal dodging hairdresser Nathan Smith - who had a head full of excuses for his puny 8st 5lb frame. Dr Christian prescribed Chris a supersized wake-up call in America to meet 32-stone 'Big Joe' Amador. Joe is only a few years older than Chris but had recently been told he has just 5 years to live - his body devastated by obesity. The show also revisits supersizer Jo who weighed in at a belt busting 24st 3lb. Convenience was her motto and cooking was definitely off the menu when she entered the feeding clinic. Jo flew to America for some shock therapy in the form of 33-stone Diana Steede. Diana's list of obesity related ailments included asthma, diabetes, high blood pressure and needing oxygen 24 hours a day. Jo also swapped diets with superskinny Emma who survived on a terrifying 800 calories a day, nibbling on crisps and squash. Three months after Chris, Nathan and Jo left the feeding clinic they all succeeded on the scales. But one year on, have they managed to stick to their new, healthy lifestyles?