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Mini-Gastric Bypass

One Anastomosis Gastric Bypass Surgery

Are you struggling with obesity and its health complications? Have you tried diet and exercise programmes without achieving lasting weight loss? If so, mini gastric bypass surgery might be the answer you’ve been searching for. Southern Weight Loss and Laparoscopy Limited is a leading provider of minimally invasive weight-loss procedures, including the mini gastric bypass. Our team of experienced surgeons and healthcare professionals is dedicated to helping you achieve a healthier, happier life.

What is Mini Gastric Bypass surgery?

The mini gastric bypass (sometimes called omega loop gastric bypass) or Single Anastomosis Gastric bypass has been performed for about 20 years. It combines properties of both the Gastric sleeve and the Roux-en-Y gastric bypass. The upper part of your stomach is divided into a tube, similar to the top three quarters of a sleeve, and then joined to a loop of intestine.

Weight Loss After Mini-Gastric Bypass Surgery:

Several studies have been published on the long term effects of the Mini Gastric bypass surgery. Two years after the surgery, weight loss is 75-85% of excess body weight; five years after the surgery, it is stable at 70-75%. So, on average, a typical patient who is 50 kilograms overweight will lose between 35– 42.5 kilograms.

Reproduced with the permission of Johnson & Johnson Medical

Reproduced with the permission of Johnson & Johnson Medical
How is it performed?​

Using keyhole surgery, the top of your stomach is stapled to form a thin tube (50ml in size). A loop of your small intestine is then joined on to your new stomach pouch. This bypasses the first part of your intestine called the duodenum and approximately 150–200cm of your small bowel. The rest of your stomach and upper part of your small intestine remains in the body but is no longer used for food digestion.

You will stay in hospital 1- 2 nights and will usually return to work within two weeks. However, everyone is different.

Other benefits:
  • Mini or Single Anastomosis Gastric bypass surgery takes shorter operating time than the Roux-en-Y gastric bypass surgery
  • Appears to be more effective for patients with a higher BMI, compared with the Roux-en-Y gastric bypass
  • Type 2 Diabetes Mellitus: Comparable results to a Roux-en-Y gastric bypass.
  • Less risk of internal hernias
  • Lifelong usage of food supplements and vitamins is necessary for all patients
  • Greater risk of malnutrition, when compared to a gastric sleeve or Roux-en-Y bypass
  • Risk of anaemia (low haemoglobin), caused by low iron levels. Women of child-bearing age are most at risk
  • Greater likelihood that patients will experience more bile reflux than after a Roux-en-Y gastric bypass

It’s important to understand that Mini Gastric Bypass Surgery is not a quick fix for weight loss. It requires a commitment to making healthy lifestyle changes, including following a balanced diet and getting regular exercise.


Before undergoing Mini Gastric Bypass Surgery, you will meet with our team of specialists to discuss your medical history, current medications, and any questions or concerns you may have. You may also be asked to undergo some tests to ensure you are a suitable candidate for the procedure.

Weight Loss Surgery is Just the Beginning

To find out more call us on
03 464 0970


What is mini gastric bypass surgery?

Mini gastric bypass surgery is a weight-loss procedure that creates a small pouch in the stomach and connects it directly to the lower small intestine. This reduces food intake and calorie absorption, leading to weight loss.

What are the benefits of mini gastric bypass surgery?

Mini gastric bypass surgery offers significant weight loss, improved management of type 2 diabetes, reduced risk of heart disease, improved sleep apnea, reduced joint pain, increased energy levels, and an overall improved quality of life.

What are the risks of mini gastric bypass surgery?

Potential risks include infection, bleeding, leakage from the connection point, and nutritional deficiencies.

Who is a good candidate for mini gastric bypass surgery?

Generally, individuals with a BMI (body mass index) of 40 or higher, or those with a BMI of 35 or higher with weight-related health problems, may be considered good candidates. However, a consultation with our team is essential to determining your suitability.