Bariatric surgery for adults can be expected to result in at least 50% excess weight loss. Average weight loss by procedure is:

• Adjustable gastric banding (AGB): 50% mean EWL with a range of 32% to 70% EWL
  • Weight loss at follow-up
    • One year: 50% EWL
    • Two years: 55% EWL
    • Five years: 50% EWL
    • 10-year data not available for AGB.
• Roux-en-Y gastric bypass (RYGBP): 68% mean EWL with a range of 33% to 77% EWL
  • Weight loss at follow-up
    • One year: 64% EWL
    • Two years: 67.5% EWL
    • Five years: 58% EWL
    • 10 years: 52% EWL.
• Biliopancreatic diversion (BPD): 79% mean EWL with a range of 62% to 75% EWL
  • Weight loss at follow-up
    • One year: 71.8% EWL
    • Two years: 75.1% EWL
    • Five years: 73.3% EWL
    • 10 years: 77% EWL.

• Grade I means there is Good/Strong evidence supporting the statement;
• Grade II is Fair;
• Grade III is Limited/Weak;
• Grade IV is Expert Opinion Only;
• Grade V is Not Assignable.
• High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
• Moderate (B) means we are moderately confident in the effect estimate;
• Low (C) means our confidence in the effect estimate is limited;
• Very Low (D) means we have very little confidence in the effect estimate.
• Ungraded means a grade is not assignable.