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Guide to BMI

Woman Exercising FDP Credit PhotostockBody Mass Index, or BMI, is a whole number calculated from your height and weight. Your body mass index corresponds to the percentage of your weight from fat. When your BMI is higher, you have a higher fat percentage in your body. Because of their body makeup, women naturally have a higher body mass index than men do.

Muscle is heavier and more dense than fat. If you have more muscle on your body, you may weigh more than an overweight person with the same body mass index. For this reason, doctors may use more sophisticated equipment to determine your BMI.

Someone who’s BMI is under 20 may be considered underweight; another person with a number of 20 to 25 may be at a healthy weight while someone who’s body mass index is over 25 may be considered overweight. Someone who’s number is over 35 is considered to be obese.

If you decide to calculate your own body mass index, you can find charts or calculators on the Internet, but these tools should only be used as a rough index, not as your true BMI. Learn more about BMI in our Bright Hub Guides.

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