Compare the 3 Weight Loss Operations

Restriction and Malabsorption
(Stomach only)
Roux en Y Gastric Bypass
Sleeve Gastrectomy
Adjustable Gastric Band

Small gastric pouch (30ml) connected to the small intestine and bypassing 1m of intestine (many other variants of Bypass are in common use)


Long narrow gastric pouch (150ml)


Adjustable silicone band (ring) around the top of the stomach, small gastric pouch (30ml)

Effects of Procedure
  • Significantly reduces meal sizes
  • Not Adjustable
  • Malabsorption (mild)
  • Dumping syndrome when sugar or fats are eaten
  • Significantly reduces meal sizes
  • Not Adjustable
  • No malabsorption or dumping
  • Moderately reduces meal sizes if eating pattern adapted
  • Adjustable
  • No malabsorption or dumping
Directly impacts on
  • Hunger
  • Speed of Eating
  • Volume of food that can be eaten
  • Absorption of calories and nutrition
  • Hunger
  • Speed of Eating
  • Volume of food that can be eaten
  • Hunger
  • Speed of Eating
Weight Loss (average at 10 years)
75% of excess weight 70% of excess weight 60% of excess weight • Requires the most effort
Long Term Daily Dietary Modification


  • Less than 1000 calories
  • Avoid sugar and fats to prevent “dumping”
  • Less than 1000 calories
  • Less than 1000 calories
  • 3 solid, textured meals, well chewed
  • No drinking with meals
Long Term Nutritional Supplements
  • Multivitamins required
  • Deficiencies infrequent
  • Multivitamins required
  • Deficiencies very rare
  • Multivitamins required
  • Deficiencies very rare
Potential Problems
Leak Dumping Syndrome Ulcers Bowel Obstruction Vitamin Deficiencies (B12, folate), anaemia Leak “Eating Squeezing”, nausea and vomiting initially Heartburn Inadequate weight loss Slow weight loss Inadequate weight loss Slippage Erosion Port problems “Blockage” Reoperation 10% (?)
Not reversible, partly modifiable Not reversible, highly modifiable Reversible, partly modifiable
Hospital Stay
3 to 4 days 1 to 3 days 1 day
Time off Work
1 to 2 weeks 1 to 2 weeks 1 to 2 weeks
Operating Time
120 minutes 90 minutes 30 minutes
Major Complications
5% 2% 1%
General Recommendation
Most eating patterns BMI >45 Most eating patterns BMI 35 to 55 Self disciplined eating style BMI 35 to 45
Typical patient Summaries
“I need the operation with the greatest weight loss.” “I am worried I will not have the self discipline required to get a band to work” “I just need a constant reminder to help me: I can lose the weight, I just can’t keep it off”
You need to discuss this with your surgeon, family and friends to try and make the best choice for you. All figures given are a rough guide only.


Dr Draper does not perform Gastric Bypass surgery and this information is provided for educational purposes.

Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.

Please Contact Melbourne Bariatrics on  03  9770  7189  for more information or to make an appointment




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