Gastric Bypass Surgery UK

What is gastric bypass surgery?

Gastric bypass surgery (also known as the Roux-en-Y bypass) reduces the size of your stomach. It is the most established weight loss procedure around the world and is carried out under a general anaesthetic.

It involves keyhole surgery and usually takes between two to three hours, depending on your individual circumstances.

Speak to a weight loss specialist

The Benefits of Gastric Bypass Surgery

Having gastric bypass surgery helps many people who previously struggled with weight loss to take back control and live a happier, healthier life. 

The bypass also affects the release of good hormones into the body, helping to reduce the feeling of hunger, ensuring consistent weight loss over a period of months (averaging 30-35% of body weight lost in 9-12 months).

Benefits of gastric bypass surgery include:

Improve weight-related issues
A healthier lifestyle
Reduced risk of heart issues
Reduced risk of cancer
Increased mobility
Lowering of cholesterol
Improved overall quality of life
Improved self-confidence
Rapid first-year weight loss
Established weight loss procedure
Reversible if necessary

5 Steps to Change Your Life

Speak to our specialists

The first step is the biggest one – get in touch with our friendly team to discuss any questions you have and book your free consultation with a bariatric surgeon.

Tailored to you

At your consultation, you will meet directly with one of our leading specialist bariatric surgeons to discuss the best solution for you and book a date for your surgery.

In our safe hands

On the day of your surgery, you will arrive at the hospital and into the safe hands of our specialist bariatric nurses and surgery team.

Here for you

After your procedure and hospital discharge, you will return home. Our dedicated aftercare team are here for you 24/7 should you have any questions or concerns.

Take back your life

Your premium aftercare starts right away! We are there with you every step of the way to help you achieve your goals and to give you your life back! #GivingBackLives.

1.
2.
3.
4.
5.

Disclaimer


As with any surgical procedure, there are possible risks and complications, including bruising, pain & swelling, reaction to anaesthetic, excessive bleeding, infection, gallstones, deep venous thrombosis (DVT), pulmonary embolism (clot to the lung), internal small bowel hernia, intolerance to certain foods, gastroesophageal reflux disease (GERD), nutritional deficiencies, vomiting, nausea, diarrhoea and death. These are uncommon and we will do everything possible to prevent them from happening.

Occasionally, patients may require an additional corrective procedure after the initial surgery and some patients might fail to lose a significant amount of weight. 10% of patients regain weight within five to ten years as the pouch dilates, hunger returns and malabsorption fades. 40% of patients may require plastic surgery procedures after weight loss has levelled off, to treat loose skin.

Approximately one in six patients may develop symptomatic gallstones after weight loss, which would require a laparoscopic cholecystectomy.

Please speak to your Tonic surgeon to discuss the risks in more detail and any concerns you may have.

Read more >

Kelly's Weight Loss Journey With Tonic

“I’ve lost 9 1/2 stone. Before surgery, I couldn’t do most things that other parents do with their children.”

Is Gastric Bypass Surgery Right for Me?

The gastric bypass surgery procedure is particularly effective in patients with type 2 diabetes (more than a five-year history, requiring multiple medications, insulin, or having diabetic complications) and troublesome gastroesophageal reflux disease.

Those who have had significant abdominal surgery should avoid the procedure.

Your surgeon will staple your stomach to create a small pouch (about the size of a thumb).

A section of your small intestine is then bypassed, making it shorter. It is reconnected to the pouch so that food bypasses part of your digestive system and is absorbed less easily by the body.

Gastric bypass surgery works by making patients feel fuller sooner so that they can reduce their portion sizes. Food is diverted to the lower parts of the intestines, missing the upper stomach and upper small intestine.

The weight loss achieved continues for 12 to 18 months.

On average, patients can expect to lose approximately 75–80% of their excess weight (a term used to describe weight above a BMI of 25) after their gastric bypass procedure.

Typically, that’s 30–35% total body weight over a period of 9 to 12 months.

Patients are usually up and walking within three hours of gastric bypass surgery and are able to drink liquids straight away.

The average postoperative hospital stay is one to two nights. Patients can expect to return to work after 7 to 10 days and to full activity within 10 to 14 days of surgery.

As patients will be eating small meals, they will be required to take vitamins and minerals to avoid deficiencies. 

Preparing for a gastric bypass

The Tonic team will be in touch before and after surgery to advise about appropriate preparations and aftercare.

Patients will often need to go on a liver-shrinking diet (800 calories a day), for around two weeks before surgery. After the operation, patients will be advised to go on a specialist diet to help with the healing process. This involves a liquid diet for two weeks, a puréed diet for one to two weeks and soft, easy-to-chew foods for one to two weeks.

Your surgeon will staple your stomach to create a small pouch (about the size of a thumb).

A section of your small intestine is then bypassed, making it shorter. It is reconnected to the pouch so that food bypasses part of your digestive system and is absorbed less easily by the body.

Gastric bypass surgery works by making patients feel fuller sooner so that they can reduce their portion sizes. Food is diverted to the lower parts of the intestines, missing the upper stomach and upper small intestine.

The weight loss achieved continues for 12 to 18 months.

On average, patients can expect to lose approximately 75–80% of their excess weight (a term used to describe weight above a BMI of 25) after their gastric bypass procedure.

Typically, that’s 30–35% total body weight over a period of 9 to 12 months.

Patients are usually up and walking within three hours of gastric bypass surgery and are able to drink liquids straight away.

The average postoperative hospital stay is one to two nights. Patients can expect to return to work after 7 to 10 days and to full activity within 10 to 14 days of surgery.

As patients will be eating small meals, they will be required to take vitamins and minerals to avoid deficiencies. 

Preparing for a gastric bypass

The Tonic team will be in touch before and after surgery to advise about appropriate preparations and aftercare.

Patients will often need to go on a liver-shrinking diet (800 calories a day), for around two weeks before surgery. After the operation, patients will be advised to go on a specialist diet to help with the healing process. This involves a liquid diet for two weeks, a puréed diet for one to two weeks and soft, easy-to-chew foods for one to two weeks.

Ashley after his gastric bypass procedure.
Kelly after her gastric bypass procedure.
Kirsten after her gastric bypass treatment.
Sarah Ash

Hi I'm Sarah Ash

I’m a Tonic Patient Coordinator; I’m here to help you start your weight loss journey

I’m a Tonic Patient Coordinator; I’m here to help you start your weight loss journey. 

It’s my job to support you through your journey with Tonic, from initial consultation where we’ll learn all about you and your weight loss journey to date, through to your 5 years of aftercare with our specialist team. 

We’re here for you at every stage. 

Book an appointment

Which Weight Loss Surgery is Right for You?

We offer a wide variety of weight loss surgeries; we’ll never recommend a surgery unless it’s 100% right for you.

Compare our available surgeries here:

Gastric Bypass
Gastric Bypass
Gastric Sleeve
Gastric Sleeve
Mini Gastric Bypass
Mini Gastric Bypass
Allurion Pill Balloon
Allurion Pill Balloon
Gastric Band
Gastric Band
Average recovery time after surgery
10-14 Days
7 days
10-14 Days
2-3 Days
5-7 Days
Surgery procedure time (in minutes)
60 mins
60 mins
70 mins
0 mins
45 mins
Estimated weight loss
60 - 70% Excess Weight Loss
70–75% of their excess weight
60 - 70% Excess Weight Loss
20% Excess Weight Loss
50 - 70% Excess Weight Loss
Tonic premium aftercare
Included
Checkmark
Included
Checkmark
Included
Checkmark
Included
Checkmark
Included
Checkmark
Scarring?
5 x Small (12mm) abdominal incisions across the middle and upper abdomen
5 small abdominal scars
5 x Small (12mm) abdominal incisions across the middle and upper abdomen
No
5 x Small (12mm) abdominal incisions across the middle and upper abdomen
Read more Read more Read more Read more Read more

Disclaimer for all Weight Loss and Bariatric Procedures

Weight loss surgery results may vary: causes for being overweight or obese vary from person to person.

Gastric Bypass Surgery FAQs with Bariatric Surgeon, Sherif Awad

Learn more about gastric bypass surgery, directly from leading bariatric surgeon, Sherif Awad. 

Want to ask questions directly to our specialists?

Our Premium Aftercare Promise

No Other Provider Offers Aftercare Like Tonic

We pride ourselves in providing the most comprehensive support package around you after your procedure. 

Weight loss surgery is a tool to help you lose weight. Our aftercare team is composed of nurses, psychotherapists, personal trainers, bariatric surgeons and other weight loss specialists. It’s our job to ensure your weight loss journey goes as smoothly as possible. 

You will not get 5 years of aftercare included with your surgery anywhere else.

Full aftercare breakdown

Unlimited Dietician Support for 2 years

Unlimited Psychotherapist Support for 2 years

Unlimited Support with Virtual Fitness Coach for 2 Years

Unlimited Bariatric Nurse Support for 2 years

5 Years Surgeon Follow Up

The Gym Group 30-day Membership

The Tonic Tool Kit

Tonics Private Social Media community support

Out Of Hours Support Line

Our Clinic Locations

Private weight loss surgery clinics and bariatric surgery specialists located across the UK.

Wherever you are in the UK, we have weight loss specialists year you.

Are there any weight loss surgery clinics near me?

Derby

Derby Private Health, Uttoxeter New Road, Derby, UK

Kent

40-42 Lee Terrace, London, UK

Leeds

Leighton Street Clinic, Leeds, UK

Leicester (Head Office)

Tonic Surgery, Charterpoint Way, Ashby-de-la-Zouch, Leicestershire, UK

London

20 Devonshire Place, London W1G 6BW, UK

Luton

Cobham Clinic, Luton, UK

Manchester

Mill Lane, Cheadle SK8 2PX, UK

Orpington

Chelsfield, Orpington, UK

Salford

Lancaster Rd, Salford, UK

Make an Appointment

Prefer to Call?

Get in touch with our bariatric specialists on 0115 950 4662

Make an appointment
Get your FREE quote Click here