<prompt> On the basis of BMI obesity is labeled at20253018  <response>: Body mass index BMI or Quetelet index:Defined as the body mass divided by the square of the body height, and is expressed in units of kgm2BMIWeight status 18.5 Underweight18.5-24.9 Healthy25.0-29.9Overweight 30.0Obese30.00-34.99 Obese class I35.00-39.99 Obese class II 40 Obese class IIIRef: Harrisons 18e p608, 622, 630 