Gallup's Alyssa Davis and Diana Liu report that Hawaii is the state with the lowest obesity index at 18.5%, closely followed by Colorado at 19.8%. They are the only two states in which the obesity rate is below 20%, according to the 2015 Gallup-Healthways Well-Being Index.

The state with the highest adult obesity rate was West Virginia at 37%. Additionally, at least one in three adults are obese in Mississippi, Delaware, Arkansas and Oklahoma.

The national obesity rate reached a new high of 28.0% in 2015, up significantly from 25.5% in 2008, when Gallup and Healthways began tracking obesity. Fourteen states had statistically significant increases in their obesity rates from 2008 to 2015, while no state registered a statistically significant decline. Maine, West Virginia, Idaho and Oklahoma experienced the sharpest upticks in obesity.

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