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What is BMI?

The body mass index is one method that doctors use to determine if an individual is at a healthy weight. The index is thought to be a more accurate indicator of body fat content than the standard height-weight tables that have been in use for over 30 years.

In addition to knowing our weight and height, it is important to understand our Body Mass Index which is basically the relationship between a person's height and weight. Body Mass Index (BMI) is one of the most accurate ways to determine when extra pounds translate into health risks and is becoming the measurement of choice used by health care professionals and investigators. Body Mass Index does not directly measure percent of body fat, although higher BMI's are usually associated with an increase in body fat, and thus excess weight.

What is the body mass index (BMI)?

The body mass index is a formula to assess a person's body weight relative to height. It's a useful, indirect measure of body composition, because it correlates highly with body fat in most people. The BMI happens to be the most commonly used measurement in epidemiological studies and for middle-aged men and women, it correlates over 90% with fat mass densitometry. The BMI is also called the Quetelet index and while it does not distinguish fat mass from lean or muscle mass, it is a very useful approximation to what one should weigh depending on height. To determine your Body Mass Index, identify your current weight and height and check it on the Body Mass Index Chart.

  The formula for determining Body Mass Index:
English - [Weight in pounds ÷ Height in inches ÷ Height in inches] x 703
  Metric - Weight in kilograms ÷ [Height in meters]2

The federal government has announced guidelines which create a new definition of a healthy weight -- a BMI of 24 or less. A Body Mass Index reading under 20 is considered underweight. Further, a BMI of 25 to 29.9 is considered overweight. Individuals who fall into the BMI range of 25 to 34.9, and have a waist size of over 40 inches for men and 35 inches for women, are considered to be at especially high risk for health problems.

Higher or elevated BMI is an indication of preventable risk that should be checked regularly by consumers and their doctors, just like high blood pressure and cholesterol levels. To determine Body Mass Index, multiply weight in pounds by 703. Then divide that result by height in inches squared.


Click here to see a Body Mass Index Chart that will help you find your Body Mass Index.

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