While Mississippi (34.9%) and Louisiana (33.4%) have the highest percentage of obese adults, Bloomberg's latest data [3] shows that Delaware and Oklahoma are getting fatter the fastest of all US states. Notably, every state has seen an increase in the level of obesity since 2000 (though D.C. and California have risen the lease). Colorado has the highest number of 'ideal weight' citizens per obese adult (4.83) but even there it has plunged from over 7 adults in 2000. Things are not getting better anywhere.
[4]
Source: Bloomberg [3]