Adult BMI categories: underweight, healthy weight, overweight, obesity classes 1-3 (CDC)
cdc_adult_bmi@1.0Underweight: Less than 18.5; Healthy Weight: 18.5 to less than 25; Overweight: 25 to less than 30; Obesity: 30 or greater; Class 1 Obesity: 30 to less than 35; Class 2 Obesity: 35 to less than 40; Class 3 Obesity (Severe Obesity): 40 or greater
Centers for Disease Control and Prevention, Adult BMI Categories (2024) · Adult BMI categories table · source
Contested: BMI cut-offs are population-specific (WHO 2004 expert consultation proposed lower action points for Asian populations; not opened) and BMI does not measure adiposity directly; the CDC page applies the categories 'regardless of age, sex, or race' for adults.
Not encoded: The CDC page states no exception for pregnancy, athletes or ethnicity; population-specific cut-offs (for example lower thresholds proposed for Asian populations) are not encoded. BMI is a screening measure (CDC); obesity as a disease (for example the 2025 Lancet Commission 'clinical obesity') needs other assessment. BMI is taken as recorded; it is not computed from weight and height.