Mean body mass index (BMI) in women, 1975 to 2016

Body mass index (BMI) is measured as a person's weight in kilograms (kg) divided by her height (in meters),squared. The WHO define a BMI <=18.5 as 'underweight'; 18.5 to <25 as 'normal/healthy'; 25.0 to <30 as'overweight'; and >30.0 as 'obese'.