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  Sleeve Gastrectomy Gastric Bypass
Time of Operation 1 - 1.5 hours 2 - 4 hours
Hospital Stay 1 - 2 nights 1 - 2 nights
Wounds Minimal
– Keyhole surgery
Minimal
– Keyhole surgery
Food Intake Food amount is restricted
Food range may be restricted
Food amount is restricted
Food range may be restricted
Nutritional Deficiencies Unlikely but potentially Iron and Vitamin B12 Potentially Iron, fat soluble vitamins, Calcium, Vitamin B12
Potential Side Effects and Complications Vomiting, Nausea, Bleeding, infection, clot formation, staple-line leak, Reflux Vomiting, Bleeding, infection, clot formation, Anastomotic leak, Dumping Syndrome, Possible change in bowel habits
Expected weight Loss after 12-18 months 50 - 60% of excess weight 60 - 70% of excess weight
Reversibility Permanent Essentially irreversible
Death Rate (within 30 days of surgery) 2-4 in 1000 2-4 in 1000
Follow Up Long term
2 years with surgery provider and annual review thereafter
Long term
2 years with surgery provider and annual review thereafter