Understanding the Differences Between the Mini Gastric Bypass and the Gastric Bypass

Weight loss surgery is a life-changing decision that comes with various options. Two commonly discussed procedures are the Mini Gastric Bypass and the traditional Gastric Bypass. In this blog, we will explore the key differences between these two surgeries, helping individuals make informed decisions on their weight loss journey.

Procedure Overview

Gastric Bypass:

The traditional Gastric Bypass (commonly known as the Roux-En-Y Gastric Bypass), is a more established procedure and has been performed for several decades. It involves creating a small stomach pouch and rerouting a section of the small intestine to both restrict the amount of food intake and reduce the absorption of calories. The traditional Gastric Bypass has a long track record of success in achieving significant and sustained weight loss.

Mini Gastric Bypass:

Maisie has lost 16st with the Mini Gastric Bypass

Maisie has lost 16 stone with the Mini Gastric Bypass

The Mini Gastric Bypass is a relatively newer, simpler and less invasive procedure compared to the traditional Gastric Bypass. It involves creating a smaller stomach pouch and rerouting a portion of the small intestine to limit the absorption of calories, similar to the traditional Gastric Bypass. However, the connection to the small intestine is different, involving a single loop instead of the two connections made in the traditional Gastric Bypass. This surgery is often praised for its simplicity and potentially quicker recovery time.

The term “mini” refers to the surgery being minimally invasive rather than being a smaller version of the traditional Gastric Bypass. Clinical Director and Bariatric Surgeon, Guy Slater, adds that ‘there really isn’t that much ‘mini’ about the Mini Gastric Bypass, sure its one anastomoses less compared to the standard Roux-En-Y Gastric Bypass, but its still major laparoscopic surgery’. The main benefits of a mini gastric bypass are that the results are almost on par with a traditional bypass, but the surgical procedure is shorter and less invasive. This means the recovery process is quicker, and there are fewer complications.

Surgical Complexity

Gastric Bypass:

The Gastric Bypass is considered a more complex surgery, involving two connections (anastomoses) and rerouting the digestive system. Typically performed laparoscopically, it requires a longer operating time compared to the Mini Gastric Bypass.

Mini Gastric Bypass:

The Mini Gastric Bypass is less complex, with a single anastomosis and a simpler rerouting of the digestive system. The less intricate nature of the surgery can contribute to a shorter operating time and potentially faster recovery. Guy Slater outlines that ‘the risks of the long term and short term of the mini bypass are certainly higher compared to the sleeve by are lower than the traditional bypass.

Raffaella has lost over 7 stone with the Roux-En-Y Gastric Bypass

Weight Loss Results

Gastric Bypass:

Gastric Bypass is known for its effectiveness in significant weight loss. Patients can typically expect to lose 60-80% of their excess weight within the first two years.

Mini Gastric Bypass:

The Mini Gastric Bypass also offers substantial weight loss, with patients often experiencing a reduction of 50-70% of excess weight within the first two years.


Gastric Bypass:

Reversing a Gastric Bypass is challenging due to the complexity of the procedure and is less common

Mini Gastric Bypass:

The Mini Gastric Bypass is considered more reversible compared to the traditional Gastric Bypass, due to its simpler nature. Therefore making it a potentially more flexible option for certain individuals.

Both the Mini Gastric Bypass and the traditional Gastric Bypass are effective weight loss surgeries, each with its own set of advantages and considerations. The choice between the two depends on factors such as individual health conditions, surgical preferences, and desired outcomes. Understanding these key differences allows patients to make informed decisions, paving the way for a successful and sustainable weight loss journey.

Remember when considering either of these options it is important to seek advice from an expert weight loss clinical team. They will be able to advise you on your best treatment option, as well as any risks or complications. If you’re ready to take the next steps to achieving significant weight loss, call us on 0333 043 8343 or fill out the form on our website to schedule your FREE virtual consultation.

If you would like some more information on which procedure will be right for you- head to our ‘How will I know which weight loss procedure is right for me?’ blog.