Morbid obesity: definitions, epidemiology, and methodological problems.

@article{Kral1987MorbidOD,
  title={Morbid obesity: definitions, epidemiology, and methodological problems.},
  author={John G. Kral and S B Heymsfield},
  journal={Gastroenterology clinics of North America},
  year={1987},
  volume={16 2},
  pages={197-205}
}
This article defines obesity, ideal body weight, morbid obesity, and indexes of overweight, pointing out some of the difficulties in studies of the epidemiology of morbid obesity.