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| - Body mass index (BMI) is a common method used to assess body weight relative to height. The reason it is so commonly employed is because it is a simple, indirect measure of body composition because it correlates highly with body fat in most people, however, the inherent flaws in the method limit the accuracy of the assessment. The weight excess or deficiency may, in part, be accounted for by body fat, although other factors such as muscularity also affect BMI significantly (see below). In studies by the National Center for Health Statistics,
- Body mass index is a standard ratio expressing a person's weight as a function of their height. It is calculated by taking a person's weight in kilograms and dividing it by the square of the person's height in meters. Adults with a BMI of between 18.5 and 25 are considered to be of "normal weight". Ranges from 16-18.5 and 25-30 are considered "underweight" and "overweight", but do not show any pathology. A BMI of under 16 or over 30 indicates a pathological weight condition and requires medical intervention.
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| abstract
| - Body mass index is a standard ratio expressing a person's weight as a function of their height. It is calculated by taking a person's weight in kilograms and dividing it by the square of the person's height in meters. Adults with a BMI of between 18.5 and 25 are considered to be of "normal weight". Ranges from 16-18.5 and 25-30 are considered "underweight" and "overweight", but do not show any pathology. A BMI of under 16 or over 30 indicates a pathological weight condition and requires medical intervention. For children, their BMI is compared against the BMI of children of the same age and sex. As long as they fall within the middle 90% of percentiles, their weight is considered "normal". However, children with a BMI in the 5th or lower percentile or the 95th or higher require medical intervention.
- Body mass index (BMI) is a common method used to assess body weight relative to height. The reason it is so commonly employed is because it is a simple, indirect measure of body composition because it correlates highly with body fat in most people, however, the inherent flaws in the method limit the accuracy of the assessment. The weight excess or deficiency may, in part, be accounted for by body fat, although other factors such as muscularity also affect BMI significantly (see below). Individuals with a BMI over 27 are considered to be at a significantly greater risk of health problems than those under 27. Female athletes who have very low BMIs (18 and below) may be at risk of developing irregular menstrual cycles; additionally, females with low overall body weights may also be at greater risk of developing osteoporosis. Standard weight scales can delineate a person's total weight, but can't determine the lean-to-fat ratio of that weight. Height and weight charts were traditionally used as guidelines (see Body Mass Index) to determine if people are overweight, but because they don't take into account a person's body composition, such methods as BMI are woefully inaccurate. For example, a person who stands 5'8" tall and weighs 230 pounds, but has only 8% body fat would be considered obese by the BMI standard (36.31 BMI). In studies by the National Center for Health Statistics,
* BMI values less than 18.5 are considered underweight.
* BMI values from 18.5 to 24.9 are healthy.
* Overweight is defined as a body mass index of 25.0 to less than 30.0. A BMI of about 25 kg/m2 corresponds to about 10 percent over ideal body weight. People with BMIs in this range have an increased risk of heart and blood vessel disease.
* Obesity is defined as a BMI of 30.0 or greater (based on NIH guidelines) — about 30 pounds or more overweight. People with *BMIs of 30 or more are at higher risk of cardiovascular disease.
* Extreme obesity is defined as a BMI of 40 or greater. Some well-trained people with dense muscle mass may have a high BMI score but very little body fat. For them, the waist circumference, the skinfold thickness or more direct methods of measuring body fat may be more useful measures.
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