The CDC defines an adult (a person aged 20 years or greater) with a body mass index (BMI) of 30 or greater as obese and an adult with a BMI of 25.0 to 29.9 as overweight.Obesity in adults is divided into three categories. Adults with a BMI of 30 to 34.9 have class 1 obesity; adults with a BMI of 35 to 39.9 have class 2 obesity; adults with a BMI of 40 or greater have class 3 obesity, which is also known as extreme or severe obesity.

Compared to non-obese Americans, obese Americans incur an average of $1,429 more in medical expenses annually, and the obese American population spends approximately $147 billion per year in added medical expenses. However, some evidence suggests the lifetime cost of medical treatment for obese individuals is lower than for healthy weight individuals. This is because healthy weight people live longer statistically and tend to develop chronic diseases that need to be continually treated into old age, whereas obese people tend to die from metabolic diseases at younger ages and avoid some of those protracted medical costs.

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