Excess weight leads to health problems. Body mass index (BMI) is a measure of the appropriateness of a person's weight. To calculate BMI, you divide weight in kilograms by the square of height in meters (BMI = weight in kilograms/height in meters 2). A BMI calculator from the National Heart, Lung, and Blood Institute is Available at http://www.nhlbisupport.com/bmi. Normal BMI is 18.5 kg/m2 to 24.9 kg/m2. People with BMIs 25 kg/m2 to 29.9 kg/m2 are overweight, and people with BMIs of 30 kg/m2 or above are obese. Unfortunately, doctors often do not address weight problems with their patients. Treatment options include counseling and behavioral therapy. Counseling educates patients to change diet and exercise. Behavioral therapies are specific strategies to help patients to make these changes. For some patients, weight loss medications or surgery may be appropriate. Recommending that doctors screen all adult patients for weight problems makes sense only if treatments are effective.