According to Gallup-Healthways Well-Being Index midyear results, an average of 26.7% of Americans were obese in the first six months of 2010, similar to the 26.5% average for all of 2009, but up significantly from 25.5% in 2008. These midyear results for the nation and for each state are based on respondents’ self-reports of their height and weight, which are then used to calculate standard Body Mass Index (BMI) scores. Individual BMI values of 30 or above are classified as “obese.”