Most of the general public had no idea what Body Mass Index (BMI) was until the controversy surrounding too-skinny models walking the world’s fashion shows. Once the announcement was made that models who didn’t meet certain BMI requirements would not be allowed on the runway, the general question became: what in the world is BMI?

By using height and weight measurements, BMI is the number that represents where one falls within a healthy or unhealthy weight range. Initially, BMI was used to calculate a person’s weight and height to help determine how much body fat someone has, as well as helping doctors identify the weight categories that could put someone at risk for health problems. That purpose changed, however, with the size zero models controversy. Slowly, young girls and adult women - and a few men - began to wonder what their BMI number was and if it fit the standard for a healthy weight.

BMI categories differ from adults to teens and there are a score of BMI calculators that can be found online. In order to calculate your BMI, simply divide your weight in pounds by your height in inches squared and multiplying that number by 705. Ideally, having a BMI less than 18.5 is considered unhealthy and grossly underweight. Those with a BMI ranging from 18.5 to 24.9 are classified within the healthy range, and individuals with a BMI ranging from 25-29.9 are considered overweight. People with a BMI in the overweight/unhealthy range are at the greatest risk of developing health problems, just as those with a BMI less than 18.5 are also putting themselves at risk that often stem from conditions such as anorexia and bulimia.

Before you freak out about your BMI (once you’ve calculated it, that is) just know that the BMI charts and standards should be used more as a guideline instead of scientific fact. There are always going to be exceptions to the rule, since everyone is built differently. Just because you may have a BMI less than 18.5 that does not automatically mean that you are grossly underweight. So keep that in mind when you calculate your BMI. If anything, use your BMI as a reference number and talk to your doctor about what it means for you.

For those hoping to lose weight or reduce their risk of developing health problems, knowing your BMI can be an aid in helping you achieve your weight loss or health goals. This is when the assistance of a nutritionist, doctor, personal trainer or other healthcare professional can help you use your BMI to your advantage. At most, BMI should be used for determining whether you need to lose, gain weight or maintain the weight you are.

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