Classification of Weight Status and Risk of Disease
| BMI (kg/m2) | Obesity Class | Risk of Disease | |
|---|---|---|---|
| Underweight | <18.5 | ||
| Healthy weight | 18.5-24.9 | ||
| Overweight | 25.0-29.9 | Increased | |
| Obesity | 30.0-34.9 | I | High |
| Obesity | 35.0-39.9 | II | Very high |
| Extreme obesity | ≥40 | III | Extremely high |
Source: Adapted from National Institutes of Health, National Heart, Lung, and Blood Institute: Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. U.S. Department of Health and Human Services, Public Health Service, 1998.