As published ina health column by Dr. Paul G Donahue from the Daily Record Newspaper.
To determine body mass index or BMI:
Divide your weight in pounds by height in inches squared. Then multiply that answer by 703. Multiplying your height in inches by itself (ex: 68 x 68) gives you 4,624. Dividing your weight (ex. 185 pounds by 4,624 yields .04). The next step is to multiply that number by 703 to arrive at a BMI of 28.
Body mass index provides an estimate of how much of your weight is muscle and bone, and how much is fat. A normal BMI is 18.5 to 24.9; 25 to 29.9 is overweight; 30 and above is obese.
Although BMI is a better health gauge than weight alone, it is far from perfect. Heavily muscled individuals end up classified as obese.
BMI also is not completely reliable for people oldeer than 75. At that age, much muscle tissue has shriveled, and these people are classified as normal when their body fat is highter than it should be.
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