In the United States, the National Institutes of Health found that over 1 in 3 Americans are obese. This conclusion was based on data gathered during the National Health and Nutrition Examination Survey from 2009 to 2010.
The threshold for classification as obese for adults age 20 and older begins at a body mass index of 30, with extreme obesity beginning at a BMI of 40. For children ages 2 to 19, a BMI at or above the 95th percentile indicates obesity.
Obesity is a major health concern in the United States, and is associated with several health conditions, such as type 2 diabetes, heart disease, and several types of cancer.