Roux-en-Y Gastric Bypass

Private Gastric Bypass Surgery in the UK

CQC Registered Provider

What is a Roux-en-Y Gastric Bypass?

A Roux-en-Y Gastric Bypass is a weight loss surgery aimed at reducing the risks of weight-related conditions. The way it works is by creating a structure that drastically reduces the space inside your stomach, leaving you feeling full for longer. This involves creating a small upper pouch of the stomach which is directly connected to the intestines. This is a permanent procedure, and you will need to make the appropriate lifestyle changes in response to it. 

Your surgery will last around 1 – 2 hours, and you should expect to stay for one night in our clinic. You should also plan to have 7 – 10 days off work, and expect a full recovery between 6 – 8 weeks. 

The average weight loss experienced by patients who have a gastric bypass is 70% of their excess weight. 

Do You Qualify for a Roux-en-Y Bypass?

If you have struggled with losing weight in the past, the Roux-en-Y Bypass may be a good option for you in order to reduce the risks associated with being overweight.  The gastric bypass is hugely successful, lending to the overall popularity of the surgery. Those looking to have a gastric bypass should have a BMI of no less than 35, but exceptions may be made if you are diabetic or are Asian.

gastric balloon patient speaks with consultant

A Brief History

The gastric bypass was initially developed in the 1960s, after two doctors observed the weight loss experienced by patients undergoing partial stomach removal for ulcers. Over several decades the technique as we know it today, the Roux-en-Y Bypass, was developed.

Associated Risks

As with any surgeries, there are risks involved in the gastric bypass procedure. These include excessive bleeding, infection, and blood clots among others. During your initial consultation, the Bariatric Consultant will be able to talk through these risks with you, including any questions you may have about them.

Gastric Balloon Consultants Crossing Arms

What to Expect

Completed in one of our centres, the gastric bypass will be conducted under general anaesthetic, and most are performed laparoscopically. Surgery usually takes a few hours, and you will stay overnight in the clinic to ensure your recovery goes in the right direction.

Average weight loss: 70% of excess weight.


It can take several weeks to fully recover from a gastric bypass. During this time, you should expect some natural discomfort as a result of the surgery but can look to optimise your recovery by following the expert advice of our medical team. Due to rapid weight loss, it is common to experience body aches, feeling tired, and mood changes in the first six months of having the bypass.

Key Points

1 - 2 hours

1 Night


1 Week 


6 - 8 Weeks

70% of Excess


Our Consultants

We only work with the highest-level bariatric consultants who perform the gastric bypass. They are all leaders in their field, so rest assured your consultant is at the top level. These include:

Mr Jambulingam
Mr Periyathambi Jambulingam
Mr Javed Sultan
Mr Javed Sultan
Allure Consultant Dr Brijesh Madhok
Mr Brij Madhok

Gastric Bypass Aftercare

Zoom call consultation with a Allure Weightloss Doctor

Don’t worry, you won’t be left to your own devices after surgery. You will be privy to 2 years of Aftercare from Allure Weightloss Specialists. This includes regular contact with a Bariatric Nurse and HCPC Registered Dietitian as standard. This is to help encourage those essential and necessary lifestyle changes to ensure the sleeve gastrectomy works as intended.

Book Your Consultation Today

Book your gastric bypass today with Allure Weightloss. Simply speak to a member of our team to discuss the procedure in and pathway in more depth.

Frequently Asked Questions

You must have a minimum BMI of 35 or a BMI of 30 if you are Asian or Diabetic. Speak to our specialists for more information.

Gastric bypasses are considered safe procedures, and can be lifesaving. 

Typically, patients can look to lose around 70% of excess weight in the year after Roux-en-Y bypass surgery. 

The Allure Weightloss Gastric Bypass Aftercare Programme is comprised of access to your GMC registered Consultant, Bariatric Nurse, and HCPC registered Dietitian for up to 2 years. 

With help from our dietitians, you will work on implementing the necessary lifestyle changes to keep off the weight lost. 

A gastric sleeve, or sleeve gastrectomy, is the process of removing up to 80% of the stomach in order to limit food consumption and reduce hunger hormones. You can find out more here

The Roux-en-Y Gastric Bypass involves creating a smaller 'pouch' from your stomach and attaching it to your intestines, bypassing the main body of your stomach.  

The most widely used measurement for obesity. The BMI approximates body mass using a mathematical ratio of weight and height [(weight in kg ÷ height in meters) or (weight in pounds ÷ height in inches x 703)]. A BMI of 30 or more is regarded by most health agencies as the threshold for obesity. A BMI of 40 or more generally qualifies as morbid obesity. However, note that BMI measurements in body-builders and athletes may not be accurate determinants of obesity because the BMI does not distinguish between muscle and fat.

  • Dumping 
  • Malnutrition
  • syndrome
  • Gallstones
  • Breakage
  • Hernia
  • Internal bleeding
  • Leakage
  • Perforation of stomach or intestines
  • Skin separation
  • Pouch/anastomotic obstruction or bowel obstruction
  • Pulmonary and/or cardiac problems
  • Spleen or other organ injury