The body mass index is an easy tool to help put weight in perspective. It can help you determine your healthy body weight. And if you are unsure how your weight compares with other people your height, the body mass index can clear up any uncertainties.
Definition
Body mass index is a standard for determining if you weigh the right amount. Start by dividing your body weight in kilograms by the square of your height in meters. As an example, consider a male who weighs 200 pounds and is 6 feet tall. To convert pounds into kilograms, divide his weight by 2.2, or about 90 kilograms. Six feet is equal to 72 inches. To convert inches to centimeters multiply total inches by 2.54, which means about 183 centimeters, in this case. The BMI equation looks like this: 90 kilograms divided by 1.83 meters squared = 26.8. This man has a BMI of 26.8.
Classification
Once you have determined your BMI, you need to figure out if you are underweight, normal, overweight or obese. Underweight is a BMI of less than 18.5. A normal BMI ranges between 18.5 and 24.9. Overweight is considered 25 to 29.9. Obesity is a BMI of 30.0 to 39.9, while extreme obesity is a BMI equal to or greater than 40.
Significance
Body mass index helps you to determine if your weight is healthy. Other methods, such as body fat testing, are useful but must be done by a professional. The body mass index is valuable because it allows you to assess yourself at any weight.
Limitations
The body mass index does have limitations. It does not take into account body composition. If you are a fit person with a high level of lean body mass, your BMI might still read as overweight or obese. If you are fit and active, the American Council on Exercise recommends using BMI along with additional methods of body composition monitoring.
Considerations
When trying to determine if your body weight is normal, also consider other aspects of your health. For instance, if you are at risk for heart disease or have been diagnosed with diabetes, your health care provider might recommend an ideal weight for you. For certain diseases, a weight reduction of just 10 pounds can help. If you are unsure about your body weight, consult your doctor. He can help guide you and approve a diet and exercise program.
References
- "Physiology of Sport and Exercise"; Wilmore, Jack H., Costill, David L.; 2004
- American Council on Exercise
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