Americans keep getting fatter and fatter.

The Robert Wood Johnson Foundation's annual state-by-state report on the obesity epidemic has revealed that between 2008 and 2010, 16 states had what was described as a steep increases in their adult obesity rate.

Twenty years ago, not a single state had an adult obesity rate over 15 percent. Now the only state which doesn't have a rate of 20 percent or more is Colorado, which sneaked in at 19.8 percent.

Nationally, the adult obesity rate stands at 25 percent. Obese is defined as having a body mass index (BMI) of 30 or high. You can calculate your BMI here.

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