Table 2.

The international classification of body weight in adults.

Classification	Principle BMI cut off point (kg/m2)	Risk of co-morbidities
Underweight	<18.5	Lowa
Healthy weight	18.5–24.9	Average
Overweight	25–29.9	Increased
Obesity, class I	30–34.9	Moderate
Obesity, class II	35–39.9	Severe
Obesity, class III	≥40-	Very severe

^∗Other health hazards may be associated with low BMI. Source: adapted from WHO, 2006 [49].