<prompt> In morbid obesity BMI is greater than?30354045  <response>: 40 REF: Sabiston Textbook of Surgery, 18th ed chapter 17 Morbid obesity is defined as being either 100 lb above ideal body weight, twice ideal body weight, or a body mass index BMI, measured as weight in kilograms divided by height in meters squared of 40 kgm2. The latter definition is more accepted internationally and has essentially replaced the former ones for all practical and scientific purposes. 