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There is, of course, no such thing as a 'healthy weight', there is only the weight which is most suitable for the individual. The health problems associated with obesity are conditions brought on by an excess of body fat, so it is this figure which needs to be determined to ascertain what problem, if any, exists and what action should be taken.
The body mass index is a useful way of estimating one's level of body fat, and is used by many GPs and physicians for doing so. It should be noted, however, that the BMI scale assesses only height and weight and can be used as a guideline only.
A score is calculated using the formula [weight] / [height]², where both measurements are given in either imperial or metric. Most people will generate a score of between 20 and 25, and this indicates a healthy weight. Those with a score of less than 20 are considered underweight, and those with a score of between 25 and 30 overweight. Obese people will have a score of more than 30.
The simplest way of calculating one's body mass index is to use one of the thousands of websites with online BMI calculator. Children, the elderly and pregnant women, however, will not get an accurate score using the BMI model and should consult their doctors to assess their own body fat