BMI: The Facts on Overweight, Obesity, & Fat"
Overweight refers to an excess of body weight, but not necessarily
body fat. Obesity means an excessively high proportion of body fat. Health
professionals use a measurement called body mass index (BMI) to classify an
adult's weight as healthy, overweight, or obese. BMI describes body weight
relative to height and is correlated with total body fat content in most
adults.
To get your approximate BMI, multiply your weight in pounds by
703, then divide the result by your height in inches, and divide that result by
your height in inches a second time. (Or you can use the interactive BMI
calculator at www.nhlbisupport.com/bmi/bmicalc.htm.)
A BMI from 18.5 up to 25 is considered in the healthy range, from
25 up to 30 is overweight, and 30 or higher is obese. Generally, the higher a
person's BMI, the greater the risk for health problems, according to the
National Heart, Lung and Blood Institute (NHLBI). However, there are some
exceptions. For example, very muscular people, like body builders, may have a
BMI greater than 25 or even 30, but this reflects increased muscle rather than
fat. "It is excess body fat that leads to the health problems such as type
2 diabetes, high blood pressure, and high cholesterol," says Eric Colman,
M.D., of the FDA's Division of Metabolic and Endocrine Drug Products.
In addition to a high BMI, having excess abdominal body fat is a
health risk. Men with a waist of more than 40 inches around and women with a
waist of 35 inches or more are at risk for health problems.
Next: Calculating Your Own BMI
Previous: Most Americans are Overweight
Adapted from: Losing Weight: Start By Counting Calories
(http://www.fda.gov/fdac/features/2002/102_fat.html)
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