<prompt> BMI obesity starts:25303540  <response>: Ans. b30Ref : K. Park 23rd ed. 399-400 BMI is Body Mass Index, aka Quetlets Index. It is calculated as: BMI weight kgheight m2ClassificationBMIUnderweight18.5Normal BMI18.5-24.99Overweightpre-obese25-29.99Obesity30.0 Grade I Grade II Grade III 30-35 35-40 50 