**Body Mass Index** utilizes one's weight and height to categorize them as being either underweight, healthy, overweight, or obese. It was invented by the Belgian Adolphe Quetelet (1796-1874) between 1830 and 1850, and is a mathematical formula:

where weight is in kilograms and height is in meters. If the weight is entered in pounds and the height is entered in inches, the equation is as follows:

## Ranges of BMI

The ranges vary from different sources, but the most used guidelines are as follows.

A BMI of **less than 18.5** indicates an **underweight** person. Many female celebrities have BMIs significantly less than this value, such as 15 or 16. Some have described the ideal BMI of a female to be 19.

A BMI **between 18.5 and 24.9** indicates a **healthy** person.

A BMI of **between 25 and 30** indicates an **overweight** person.

A BMI of **over 30** indicates an **obese** person.

Atheists tend to, more than the rest of the population (especially Christians), land on the higher side of the BMI range.