| 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 |