BMI is a commonly used measure of overweight and obesity. It is calculated from your height and weight. An elevated BMI is associated with an increased risk for diseases and weight-related comorbidities. 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.
The BMI is calculated from the weight and square of the height as follows:
BMI = body weight (kg) ÷ height (meters) squared
Adults with a BMI of:
less than 18.5 are considered underweight
18.5-24.9 are considered normal weight
25-29.9 are considered overweight
30 or higher are considered obese (35-34.9: Obesity Class 1; 35 to 39.99: Obesity Class 2)
40 or greater are considered morbidly obese
Adapted from http://www.nhlbisupport.com/bmi/bmicalc.htm
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