Body Mass Index, How to tell if you are in overweight?
The body mass index, or BMI,
helps clarify an important distinction between being overweight or being obese.
If you weigh too much, you’re overweight. But if you have a very high
proportion of body fat, you’re obese. Based on your body mass index, your
doctor or another health professional will classify your weight as healthy,
overweight, or obese.
According to the National
Heart, Lung and Blood Institute (NHLBI), the BMI “describes body weight
relative to height and is correlated with total body fat content in most
adults.” In almost all cases, this means that the BMI will accurately reflect
your weight and proportion of body fat as a function of your height and weight
when categorizing you as healthy, overweight, or obese.
Calculating your approximate
body mass index is relatively straightforward, although you’ll probably need a
calculator to save time. To get your BMI, multiply your weight in pounds by
703. Next, divide that result by your height in inches. Then divide that result
by your height in inches one more time.
As an example, let’s say you
weigh 180 pounds and are 5 feet 10 inches tall.
Multiply 180 by 703 to get
126,540. Next, divide this by 70 (70 inches is the same as 5′ 10″) to get
1807.7. Now, share 1807.7 by 70 one more time. The result — 25.8– is your
approximate BMI or body mass index. If you don’t have a calculator handy, you
can get the same result using the free interactive BMI calculator at
www.nhlbisupport.com/bmi/bmicalc.htm.
If the above example sounds
you, you might be surprised to learn that you’re ever so slightly more
substantial than your doctor might like. A BMI from 18.5 up to 25 is considered
healthy, from 25 up to 30 is classified as overweight, and 30 or higher is
obese.
Generally, says the NHLBI, the
higher a person’s BMI, the greater the risk for health problems. In addition to
causing your BMI to skyrocket, excess body fat is a well-recognized health
risk. Men and women with waistlines above 40 and 35 inches, respectively, are
much more at risk for health problems like Type 2 diabetes, high blood
pressure, and high cholesterol.
Like every rule of thumb, this
one also has its exception. Bodybuilders, for example, often have a body mass
index above 25 and sometimes even above 30. In this case, however, the higher
BMI reflects the fact that bodybuilders have more muscle mass without having
more fat.
Finally, there’s still only
one sure way to lower your BMI if you’re overweight or obese: Eat less and
exercise more. Your body will burn more calories than you eat, and your body
mass index will go down over time.
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