A frequent use of the BMI is to assess how much an individual’s body weight departs from what is normal or desirable for a person of his or her height. The weight excess or deficiency may, in part, be accounted for by body fat (adipose tissue) although other factors such as muscularity also affect BMI significantly (see discussion below and overweight). The WHO regard a BMI of less than 18.5 as underweight and may indicate malnutrition, an eating disorder, or other health problems, while a BMI greater than 25 is considered overweight and above 30 is considered obese. These ranges of BMI values are valid only as statistical categories when applied to adults, and do not predict health.
| Category | BMI range ? kg/m2 | BMI Prime | Mass (weight) of a 1.8?metres (5?ft?11?in) person with this BMI |
| Severely underweight | less than 16.5 | less than 0.66 | under 53.5?kilograms (8.42?st; 118?lb) |
| Underweight | from 16.5 to 18.4 | from 0.66 to 0.73 | between 53.5 and 60 kilograms (8.42 and 9.4?st; 118 and 130?lb) |
| Normal | from 18.5 to 24.9 | from 0.74 to 0.99 | between 60 and 81 kilograms (9.4 and 12.8?st; 130 and 180?lb) |
| Overweight | from 25 to 30 | from 1.0 to 1.2 | between 81 and 97 kilograms (12.8 and 15.3?st; 180 and 210?lb) |
| Obese Class I | from 30.1 to 34.9 | from 1.21 to 1.4 | between 97 and 113 kilograms (15.3 and 17.8?st; 210 and 250?lb) |
| Obese Class II | from 35 to 40 | from 1.41 to 1.6 | between 113 and 130 kilograms (17.8 and 20?st; 250 and 290?lb) |
| Obese Class III | over 40 | over 1.6 | over 130?kilograms (20?st; 290?lb) |
The U.S. National Health and Nutrition Examination Survey of 1994 indicate that 59% of American men and 49% of women have BMIs over 25. Morbid obesity?a BMI of 40 or more?was found in 2% of the men and 4% of the women. The newest survey in 2007 indicates a continuation of the increase in BMI: 63% of Americans are overweight, with 26% now in the obese category (a BMI of 30 or more). There are differing opinions on the threshold for being underweight in females; doctors quote anything from 18.5 to 20 as being the lowest weight, the most frequently stated being 19. A BMI nearing 15 is usually used as an indicator for starvation and the health risks involved, with a BMI <17.5 being an informal criterion for the diagnosis of anorexia nervosa.
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