Mississippi Again the Fattest State in the Union South has 10 of 11 porkiest states By Imperator , Newser Staff Posted Jun 29, 2010 8:33 PM CDT Promoted on Newser Jun 30, 2010 8:29 AM CDT 15 comments Comments (AP) (User Submitted) – The South continues to rise. Or at least expand. For the sixth year in a row, Mississippi tipped the scales as the most obese state in the union, according to the Trust for America's Health. Some 34% of its residents are classified as obese, and 10 of the 11 states with the highest obesity rates were in the South. But there must be something in that Rocky Mountain air—Colorado came in, again, as the least obese state. To find out how fat (or not) your state is, read the full article.