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Table 1 Categories of Obesity and NICE Guidelines (5) on Surgery for Morbid Obesity*

From: Outcome of gastroplasty and gastric bypass in a single centre in the UK

Category BMI (kg/m2)
Underweight <18.5
Normal 18.5-24.9
Overweight 25.0-29.9
Obesity Class I 30.0-34.9
Obesity Class II 35.0-39.9
Obesity Class III >40
As Per NICE Guidelines, The individual  
   • Must be aged 18 or over
   • Has to have been receiving treatment in a specialist obesity clinic as a hospital
   • Has tried all other appropriate non-surgical treatments to lose weight but have not been able to maintain weight loss
   • Has no specific medical or psychological reasons why they shouldn't have this type of surgery
   • Is generally fit enough to have an anaesthetic and surgery
   • Understands that they will need to be followed up by a doctor and other healthcare professionals such as dieticians or psychologists over the long term
  1. *Morbid Obesity = BMI >40 kg/m2
  2. = BMI 35-40 kg/m2 and significant disease that may be improved if weight loss is achieved (e.g. diabetes, hypertension)