The Omega Loop Gastric Bypass (also known as Mini Gastric Bypass or Single Anastomosis Gastric Bypass ) has become increasingly popular due to the excellent weight loss and beneficial effects on diabetes.
It works by restricting food intake as well as reducing calorie absorption. A small stomach is first created and then the small intestine is brought up from below and joined it. There is only one anastomosis (join) made between the small intestine and the stomach pouch which makes it a simpler operation than the more traditional Roux-en-Y gastric bypass. This reduces risk associated with a second join namely that of anastomotic bleeding, leak etc. as well as a much lower incidence of bowel obstruction.
Laparoscopic (keyhole) surgery: Yes
Expected weight loss: 80-90% of excess weight loss in the first 24 months
● Most established long-term surgery for obesity
● There is lots of long-term data available about outcomes and complications
● Arguably achieves the most weight loss out of the three common bariatric surgeries
● High chance of resolution of type 2 diabetes
● More follow-up required than gastric sleeve surgery
●Stomach ulcers are a small risk (not suitable for smokers)
● May lead to nutritional deficiencies in the medium to long-term due to the reduction in
absorption of some essential nutrients (malnutrition is rare but can occur in 1% of
● May lead to a change in bowel habits such as diarrhoea
● Dumping syndrome may occur (flushed feeling after sugary intake)
Average hospital stay: 2 – 3 days
Average time off work: 2 -3 weeks