Body fat percentage is approximated by determining body mass index (BMI), which is a function of height and weight. However, note that, sometimes, BMI is misleading. For example, athletes might be “overweight” according to their BMI, when actually they are very fit and just have more heavy muscle than the average person. That said, in general, a person with BMI over 30 kg/m2 is considered obese.
By definition, obesity means an excess amount of body fat. Body fat can be expressed either as a percentage of total body weight, or through a Body Mass Index (BMI) calculation, which takes into account a person’s weight and height. For women, obesity is when her body fat is over 30% with the average between 25-30%. For men, obesity is over 25% body fat, with the average falling between 18-23%. For adult men and women, the BMI scale is as follows: normal weight is between 20-25 BMI units, overweight from 25-30, obese from 30-35, significantly obese from 35-40, morbidly obese from 40-45, super obesity from 45-50, and super-morbidly obese over 50 BMI units. The second link below is a BMI chart for adults.
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