One Anastomosis Gastric Bypass (OAGB)
(Also known as omega or mini bypass)
Overview
The OAGB is performed through 5 small keyhole incisions (5–12 mm). The stomach is divided to create a small narrow pouch, which is then connected directly to a loop of small bowel — bypassing a portion of the intestine. Only one bowel join is required, making the operation somewhat simpler and shorter than the Roux-en-Y.
Benefits
The OAGB produces significant changes in gut hormones, driving substantial weight loss and often improving or resolving Type 2 Diabetes. Most patients lose 70–80% of their excess body weight. It is particularly effective for metabolic improvement even before significant weight loss occurs.
Risks and considerations
Potential risks include bile reflux into the stomach pouch, nutritional deficiencies requiring lifelong supplementation, and the general risks of major abdominal surgery. Dr Cocco will guide you through whether this or the Roux-en-Y is most suitable for your circumstances and can explain the surgical risks in further detail.
Recovery
Most patients stay 1-2 nights in hospital. Return to light work is typically 2 weeks, with dietary stages guided by the dietitian. Lifelong nutritional supplementation and regular blood test monitoring are part of ongoing care.
Which bypass is right for me?
Dr Cocco will help you understand which procedure is most appropriate — taking into account your weight loss goals, any existing reflux, and your overall health. Both are highly effective and the decision is made together at consultation.
Recovery
Hospital stay is typically 1-2 nights. Most patients return to desk work within 2 weeks. Dietary stages are carefully supervised and lifelong vitamin and mineral supplementation is required.
Roux-en-Y Gastric Bypass
Overview
One of the most well-studied weight loss procedures in the world, the Roux-en-Y is also performed through 5 keyhole incisions (5–12 mm). The stomach is divided into a small pouch, which is joined to a section of small bowel. A second connection is then made further down — creating the distinctive 'Y' shape that gives the procedure its name. Food bypasses the lower stomach and the first part of the small intestine.
Benefits
Patients typically lose 70–80% of excess body weight. The Roux-en-Y is particularly effective for patients with significant reflux disease and is the preferred revision option for bile reflux after a sleeve or OAGB. It has the longest evidence base of any bariatric procedure.
Risks and considerations
The Roux-en-Y involves two bowel joins rather than one, carrying a slightly higher risk profile. Lifelong nutritional supplementation and regular follow-up are essential. Dr Cocco will discuss which bypass is most appropriate for your individual circumstances.
Which bypass is right for me?
Dr Cocco will help you understand which procedure is most appropriate — taking into account your weight loss goals, any existing reflux, and your overall health. Both are highly effective and the decision is made together at consultation.
Recovery
Hospital stay is typically 1-2 nights. Most patients return to desk work within 2 weeks. Dietary stages are carefully supervised and lifelong vitamin and mineral supplementation is required.
