Obesity is a complex disorder involving an excessive amount of body fat. It isn’t just a cosmetic concern but can increase your risk of diseases and health problems, such as heart disease, diabetes and high blood pressure.
Being extremely obese means you are especially likely to have health problems related to your weight.
The good news is that even modest weight loss can improve or prevent the health problems associated with obesity. Dietary changes, increased physical activity and behavior changes can help you lose weight. Prescription medications and weight-loss surgery are additional options for treating obesity.
Defining Adult Overweight and Obesity
Weight that is higher than what is considered as a healthy weight for a given height is described as overweight or obese. Body Mass Index, or BMI, is used as a screening tool for overweight or obesity.
Adult Body Mass Index (BMI)
Body Mass Index (BMI) is a person’s weight in kilograms divided by the square of height in meters. A high BMI can be an indicator of high body fatness.
To calculate BMI, see the Adult BMI Calculator or determine BMI by finding your height and weight in this BMI Index ChartExternal.
- If your BMI is less than 18.5, it falls within the underweight range.
- If your BMI is 18.5 to <25, it falls within the normal.
- If your BMI is 25.0 to <30, it falls within the overweight range.
- If your BMI is 30.0 or higher, it falls within the obese range.
Obesity is frequently subdivided into categories:
- Class 1: BMI of 30 to < 35
- Class 2: BMI of 35 to < 40
- Class 3: BMI of 40 or higher. Class 3 obesity is sometimes categorized as “extreme” or “severe” obesity.