Is BMI the Best Tool to Determine Healthy Weight?

The WHO today recognizes the validity of the Body mass index (BMI) and has set the following ranges to determine the distinction between being thin and being overweight or obese.

Classification	BMI Range
Normal	18.5 and 24.9
Underweight	Under 18.5
Overweight	25 to 29.9
Obese	30.39.9

Calculate your BMI
To calculate your BMI, simply divide your weight—measured in kilograms—by your height squared—measured in meters

Limitations

Height

The mathematics of calculating BMI by dividing weight means that it returns too large a number for short people and too small a number for taller people: short people will be rated as being thinner and tall people fatter than they actually are.

Muscularity

Since muscle is heavier than fat, heavily muscled people, like athletes, weightlifters, boxers, etc. by virtue of their higher muscle mass, will be adjudged overweight or obese, despite having a lean midsection.

Ethnicity

Ethnic origin also affects BMI, which limits its use as a risk predictor for lifestyle diseases.

Health Risk	Women	Men
Low Risk	Below 0.8	Below 0.9
Moderate	0.81 to 0.85	Between 0.9 and 1.0
High Risk	0.86 or more	Above 1.0

 

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