Weight Loss Surgery
Mini Gastric Bypass
Everything you need to know about mini gastric bypass weight loss surgery, from experts in bariatric surgery.
Medically reviewed by Prof Rishi Singhal MBBS, MRCS, FRCS, MD
- Last Reviewed 23/09/2026
Mini Gastric Bypass Overview
The mini gastric bypass (MGB) is an attractive alternative to the traditional Roux-en-Y gastric bypass (RYGB). In fact, if you are considering a bypass or gastric sleeve then it’s worth considering the mini bypass too.
The mini bypass is now established in the NHS and we expect numbers to increase rapidly. It offers a number of benefits over the traditional ‘Roux-en-y’ gastric bypass, some of which are significant. Here are the benefits:
- Weight loss outcomes are marginally better with the mini than the Roux-en-y
- The bowel is not cut through and re-attached to the stomach, and there is only one anastomosis (join between the stomach and bowel). Less cutting means less risk and a faster recovery
- The mini bypass is a quicker procedure than a roux-en-y
- The risk of an internal hernia (the most worrisome risk for bypass patients, reduces to near zero with the mini)
- Average Length of Stay
- Operation Duration
- Anaesthesia
- Recovery Duration
- Excess Weight Loss
- BMI Eligibility
- 12 Nights
- 45 - 60 Minutes
- General Anaesthesia
- 14 Days
- 60 - 70%
- 40+
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Average Length of Stay
2 Nights -
Operation Duration
45 - 60 Minutes -
Anaesthesia
General Anaesthesia -
Recovery Duration
14 Days -
Excess Weight Loss
60 - 70% -
BMI Eligibility
35+
How the Mini Bypass works
As with the standard Roux-en-Y gastric bypass, the mini gastric bypass works both by restricting the amount of food that can be eaten at any one time, and by altering gut hormones involved in appetite control. Mini gastric bypass as we know it today was developed by Dr Robert Rutledge in 1997. Since then tens of thousands of procedures have been done and MGB is growing in popularity in many countries around the world. For many patients it provides a quicker and more effective alternative to the traditional bypass. Most patients considering gastric sleeve should also consider MGB too.
- Patients appear to experience a little more nutritional deficiency in the very long term. That said, we think new surgical techniques, with a shorter limb of 150cm, largely overcome this.
- Early studies showed an increase in acid reflux. The later publications don’t show this, and…
- There is relatively little data when compared to the RYGB. Set against the benefits these disadvantages seem very modest.
The main difference between the standard Roux-en-Y gastric bypass procedure and the mini gastric bypass can be seen by comparing the two diagrams in the above video. You can see that in the case of the mini bypass, there is only one anastomosis (join between stomach and bowel), whereas in the standard Roux-en-Y bypass, there are two; an upper and lower. Because of this, the mini gastric bypass can be done in less time than Roux-en-Y.
The importance of great aftercare is often underestimated when it comes to mini gastric bypass. Most patients enjoy excellent weight loss in the first year or two but some weight regain is quite common after a few years. This can be reduced by adopting the correct dietary and exercise habits in the first couple of years after surgery.
Healthier Weight mini gastric bypass patients benefit from 5 years post-operative care including medical monitoring via regular follow-ups with our specialist bariatric nurses and surgeon reviews if required
Mini Gastric Bypass Procedure
The procedure is carried out laparoscopically via key-hole incisions in the abdomen.
- 45min - 1hr operation
- 2 night hospital stay
- 90 day return to theatre cover
Dedicated Support
Our range of nutritionists, Health Coaches and support team are here to help every step of the way
- 5 year comprehensive aftercare
- 24/7 Live App Support
- Group Health Coach sessions
- Lifelong support and advice
- Private Facebook support group
Weight Loss Tools
Videos and live classes on diet, fitness, behaviour change, body composition scales and activity tracker.
- WI-FI Scales
- Personalised App
- Healthier Weight Starter Kit
- Nutritional food diary
- Weight and activity trackers
Amymay’s Transformation
Lost 12 Stone
“Weight Loss Surgery Is Just The Beginning. Healthier Weight Are With You For The Journey”
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Lost 11.3 Stone
“Three words that I’d use to describe myself now are disciplined, motivated and optimistic!”
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Priory Road, Birmingham, B5 7UG
13-14 Fitzroy Square, London W1T 6AH
Chalybeate Cl, Southampton SO16 6UY
Clinics offering the Mini Gastric Bypass
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Patient Care Coordinator
My role is to support you with starting your weight-loss journey with Healthier Weight. During our conversation, we will explore the choices available to you and address any questions and concerns you may have. When you feel ready to move forward, we will arrange a free, no obligation consultation with one of our surgeons.
All content on this page is reviewed by a multi-disciplinary team led by Prof Rishi Singhal.