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Body Mass Index (BMI)

BMI is a useful measure of overweight and obesity. It is calculated from your height and weight. BMI is an estimate of body fat and a good gauge of your risk for diseases that can occur with more body fat. The higher your BMI, the higher your risk for certain diseases such as heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.

Although BMI can be used for most men and women, it does have some limits:

  • It may overestimate body fat in athletes and others who have a muscular build.
  • It may underestimate body fat in older persons and others who have lost muscle.

Use the BMI Calculator or BMI Tables to estimate your body fat. The BMI score means the following:

  BMI
Underweight Below 18.5
Normal 18.5–24.9
Overweight 25.0–29.9
Obesity 30.0 and Above

For people who are considered obese (BMI greater than or equal to 30) or those who are overweight (BMI of 25 to 29.9) and have two or more risk factors, it is recommended that you lose weight.

Evaluation Measure
Underweight <18.5
Normal 18.5 – 24.9
Overweight 25 – 29.9
Obese I 30 – 34.9
Obese II 35 – 39.9
Morbidly Obese III ≥40
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