Table 1

WHO classification of weight and the risk of co-morbidities according to BMI values (BMI=weight in kg/height2 in metres)

WHO classificationBMI (Kg/m2)Risk of co-morbidities
BMI, body mass index; WHO, World Health Organisation.
Underweight<18.5Low (but risk of other clinical problems increased)
Normal weight18.5–24.9Average
Overweight25.0–29.9Mildly increased
Obese≥30.0
    Class I30.0–34.9Moderate
    Class II35.0–39.9Severe
    Class III≥40.0Very severe