Gastric Bypass Surgery

− 0% finance option
− Free, no-obligation consultation
− GMC-registered gastric bypass surgeons
− Care Quality Commission-registered
− Comprehensive aftercare

Patient Journey Female WL 01

What is a gastric bypass?

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What are the benefits of a gastric bypass?

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How safe is gastric bypass surgery?

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Is a gastric bypass right for me?

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Why choose The Hospital Group for weight loss surgery?

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How much does a gastric bypass cost?


What is a gastric bypass?

Gastric bypass surgery is a procedure that can help you to achieve long term weight loss. It can be an effective solution for anyone who has tried many other methods of diet and exercise, yet still has a body mass index (BMI) of 30 (or above). 

This procedure can take different forms, but one of the most popular in the UK is called a Roux-en-Y gastric bypass. The goal of each procedure is always the same - reducing the size of your stomach, which restricts how much you can eat. A gastric bypass also affects your hunger and appetite levels.

An alternative procedure to the Roux-en-Y gastric bypass is a mini loop gastric bypass. This is a newer type of bypass which works in much the same way and offers the same benefits. The key difference is that a mini gastric bypass will involve less 'rerouting' of the digestive system.

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In a gastric bypass operation, your digestive system is rebuilt to change how your stomach and intestines manage your food intake. A smaller pouch is created in the top part of your stomach, which leaves a larger pouch in the lower part of your stomach that will no longer be used.

In essence, this procedure makes the stomach smaller. The smaller pouch is connected to your small intestine by a small tunnel created by your surgeon – 'bypassing' the rest of the stomach. The food you eat after a gastric bypass also misses out the first section of your small intestine.

The difference between a Roux-en-Y and a mini gastric bypass is in the number of anastomosis (or joins) between the stomach and bowel. A Roux-en-Y gastric bypass has two of these 'joins' – upper and lower. A mini bypass will have just one and misses out more of the small intestine.

In both procedures, you'll experience an increase in hormones that make you feel satisfied. At the same time, the hormones that make you feel hungry will be reduced, which will reduce your overall appetite too. As a result, a gastric bypass can help you lose weight safely and effectively over time. 

What are the benefits of a gastric bypass?

Gastric bypass surgery can help you achieve your long-term weight loss goals. The third 2020 National Bariatric Surgery Register study found that, on average, a person can lose more than 70% of excess weight within one year of surgery.

If you decide to have gastric bypass surgery, you might find that substantial weight loss leads to better mobility, an increase in energy levels, and a number of improvements to your quality of life. This can include a wider choice of clothing that would've previously felt uncomfortable.

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A gastric bypass may also help with a number of weight-related health issues. Type 2 diabetes and hypertension are among the conditions that are known to be improved with gastric bypass surgery. Every patient is different, but this is something we can discuss with you.

Once you start to see the results from your procedure, you might be able to live a more active lifestyle with your family and friends. And you may also feel more confident in social situations because of your slimmer body.

How safe is gastric bypass surgery?

There are risks involved with all surgical procedures. If you believe that gastric bypass surgery could help you, it's also important you know what the risks are before you go ahead. By doing so, you can weigh up those risks against the benefits your procedure could bring.

We want your decision to be made based on all the facts, and so we'll discuss all the potential risks of a gastric bypass during your consultation. You can also ask any questions you might have.

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In some cases, gastric bypass side effects can include bleeding, infection, pain, scarring, or reflux.

Is a gastric bypass right for me?

This procedure could be the answer to shedding your excess weight and living a healthier life. It's not for everyone, but you might be suitable if you suffer with obesity, have a body mass index (BMI) of 30 or over, and tried to lose weight in other ways that haven't worked.

We may also be able to offer you gastric bypass surgery if you have an existing medical issue linked to weight, although you must be prepared to change your lifestyle too. This means following the advice of our dietitians, for example, and making healthier food choices in future.

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It'll also help is you engage in regular planned exercise after surgery to achieve, and maintain,  your weight loss results. The impact of a gastric bypass can be life-changing, and our expert surgeons can advise you on whether you're a suitable candidate during your consultation.

Why choose The Hospital Group for weight loss surgery?

Let us help you achieve a healthier lifestyle. The Hospital Group has more than four decades of experience of providing Roux-en-Y and, more recently, mini gastric bypass surgery. With our high levels of care and years of experience, we help our patients to transform their lives for the better.

There are many benefits to coming to us for a gastric bypass procedure, which include:

  • Our advanced medical facilities, including our own state-of-the-art Burcot Hall private hospital in Bromsgrove, as well as a network of clinics located around the UK.
  • Highly qualified bariatric surgeons with in-depth experience and years of expertise, who are all fully registered with the General Medical Council - for your complete peace of mind.
  • A holistic approach to your health and wellbeing, starting from your first consultation with us and continuing right through to the comprehensive aftercare packages we offer.
  • An ability to cater for a wide range of budgets, thanks to our competitive pricing. We can also offer flexible finance options to make your weight loss goals more affordable.


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As our patient, you're at the centre of everything we do. Each person in our care can expect to receive a standard of service that's personal to them and tailored to their requirements.

How much does a gastric bypass cost?

No two patients that we care for are the same, and so each procedure will be different. What we can offer you depends on your unique needs. At your consultation, one of our surgeon assistants is on hand to talk you through everything involved – including the costs.

We're proud to provide a number of finance options for you to choose from. It means you'll get the option of paying in one instalment, or spreading the cost over a period of up to five years. Our pricing and finance page has more details about all the various payment options available.



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To start, you can use our price check form to get an idea of the costs involved. But your tailored treatment plan will give you much more detail, based on your exact needs and your budget. If you'd like to make a finance application, we do this free of charge and with zero obligation to go ahead with your procedure.

Gastric Bypass Brochure

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Patient Stories

Craig George

Managing my food is no big issue any more, because food is something I eat to survive. No longer am I surviving to eat.

Patient Stories

Shannon McGaughey

My name is Shannon. I’m 25, and I had a gastric bypass in December 2019 with Transform Hospital Group. I am 9 months into my weight loss journey and so far I have lost an amazing 9 stone!



Gastric Bypass Surgery FAQs

More FAQs
Why get gastric bypass surgery?
Like any surgical procedure, having a gastric bypass is a major decision, but there can be great benefits from it. It's a proven method of weight loss, and is ideal when you have a lot of weight to lose and have already tried many conventional methods without long-term success.
What are the advantages of gastric bypass surgery?
For anyone suffering with serious obesity, the advantages of gastric bypass surgery often tend to outweigh the risks. The benefits can include:

− Improvements in heart disease and cancer risk factors
− Lower cholesterol levels
− Improvements in a range of health conditions including sleep apnoea, asthma, joint pain, arthritis, reflux, fatigue, and shortness of breath
− Reduced feelings of depression, improved self-esteem, and confidence, as well as an increased sense of wellbeing

The third 2020 National Bariatric Surgery Registry Report also found how the Roux-en-Y gastric bypass reduced the incidence of Type 2 diabetes in patients from 34% to 14% in only one year. The prevalence of hypertension also fell from 38% to 22% in the year after Roux-en-Y surgery.
Gastric bypass vs sleeve vs band: Which should I get?
Here at The Hospital Group, our specialist team will help you find the weight loss solution that's right for you. We offer several different procedures, including gastric bypass, gastric band and gastric sleeve surgery.
As part of your initial consultations, your surgeon assistant and surgeon will guide you through the key differences between a gastric bypass and other options. That way, we can help you find the best solution that's in line with your weight loss goals.
Gastric bypass surgery: What is it and what happens during it?
Gastric bypass surgery is a proven method of weight loss which could be perfect if you've tried other conventional methods without seeing long-term success. We can offer a complete service, including skilled surgeons, specialist dietitians, nurses, and weight loss support team members. We see this as the best way to help you get the best possible results from your weight loss journey.
The operation is carried out under general anaesthetic, generally using keyhole (laparoscopic) surgery. This means your surgeon will make several small cuts into your stomach and use a set of small medical instruments that are guided by a telescope equipped with a camera.
A stapling device is used to make the pouch at the top of your stomach. The next step is to cut the small intestine and connect to the stomach pouch. The amount of small intestine 'bypassed' will be determined by the weight you want to achieve, and the nutrients required to maintain it.
The small cuts will then be closed by your surgeon with stitches or metal clips.
How long does gastric bypass surgery take?
This depends on the patient, the surgeon, and the type of gastric bypass operation. For Roux-en-Y procedures, it normally between 90 minutes and two hours if carried out by keyhole surgery. A mini-loop gastric bypass can be a quicker procedure.
If you’re having a gastric band removed at the same time, the operation will usually take longer. But you can discuss this with your surgeon.
What happens after the gastric bypass procedure?
After gastric bypass surgery, you'll only be able to manage smaller portions of food and as a result your body will absorb fewer calories. There will also be changes in your gut hormones that will lead to reduced feelings of hunger, so you should feel satisfied for longer on smaller portions.
As with any weight loss, a healthy diet and regular exercise are needed to ensure you achieve the best results. And this means you'll have to make a few lifestyle changes.

How long will I be in hospital?
Again, this depends on the patient and the surgeon. Usually, you'll stay in one of our specialist hospitals for 2-3 nights after your surgery, but in some cases you can return home after one night.
How long is the gastric bypass recovery time?
The gastric bypass recovery time varies from person to person. Your surgeon and bariatric team will tell you what this will be for you as part of your personalised care plan. After you leave hospital, we advise you don’t do anything too strenuous for at least six weeks after your surgery.
Are there any gastric bypass side effects?
As with any surgery, there can be complications during and after surgery. These include:
− Bleeding
− Complications due to anaesthesia and medications
− Infections
− Blood clots on the lung
− Deep vein thrombosis
− Wound breakdown or leaks from the staple line
− Spleen injuries
− Marginal ulcers
Such complications are rare, however. Our expert surgeons are highly skilled and experienced in performing bariatric procedures, with a proven record of safe, successful surgery. We'll be sure to make you aware of all the possible short and long-term risks of gastric bypass surgery too. That way, you're fully informed before you decide to have the procedure.
What does my BMI need to be for gastric bypass surgery?
A gastric bypass could be suitable if you have a BMI of 40 or more – or 35 or more if you have an obesity-related condition such as Type 2 diabetes. New guidelines state that surgery should be offered as a first-line treatment if you were recently diagnosed with Type 2 diabetes and your BMI is over 30. These are just guidelines, however, and every patient is different.
Will gastric bypass surgery help if I have diabetes?
The World Health Organization (WHO) believes that being overweight/obese is major risk factor for diabetes. The unique changes in gut hormones that follow a gastric bypass are also thought to improve diabetic control, independently of weight loss.
While we can't guarantee that your personal management of diabetes will change, many of our patients have reduced their diabetic medications and improve their condition overall.
Can gastric bypass surgery be reversed?
No – this type of surgery is permanent. If you're looking for something less permanent, gastric band surgery could be an alternative.
Can I have gastric bypass surgery twice?
It's possible to revise your gastric bypass. But this does have increased risks of complication. For this reason, a second gastric bypass generally won't be offered if you've regained weight and didn't make the changes needed to your diet and lifestyle.
What can I eat after gastric bypass surgery?
It's really important you follow the advice of your dietitian and surgeon in relation to your diet after a gastric bypass. You’ll need to follow a nutritious and healthy diet, making sure you consume the right amounts of protein and vitamins.
Our team will go through this in detail with you, so you know exactly what you can eat after a gastric bypass. As you can't absorb as many minerals and vitamins after gastric bypass surgery, you must take supplements for the rest of your life.
You'll also need regular blood tests to check for any nutritional deficiencies

After 2-3 months, most patients are usually back on a varied diet of solid food. Some patients may struggle with certain textures of food, however, such as bread or red meat.
In addition, a phenomenon known as Dumping Syndrome can occur if too much sugar is consumed. This results in symptoms such as dizziness, sweating, palpitations, and bloating. Patients often say these symptoms can help stop them from eating too much sugar and enhance weight loss.
What can I drink after gastric bypass surgery?
A gastric bypass won't affect what you can drink, or how much. But it's vital to remember the dietary advice that our team will give you to help achieve your goals. Drinks high in sugar (e.g., colas) or calories (e.g., alcohol) can reduce the weight loss impact of a gastric bypass.
How much is gastric bypass surgery?
All of our treatment plans are based on your unique needs as our patient. As each plan is tailored to you, this means the costs will differ from person to person. But you can always use our price check guide to get a rough idea of how it will work with your budget.
You can pay for your treatment outright, or take advantage of our finance options. These plans can help spread the cost of a gastric bypass from between two and five years. We also have an attractive 0% interest payment plan over a 12-month period.
All finance options are subject to status. Terms and conditions apply. Our plans are provided by Omni Capital Retail Finance Limited, who are regulated by the Financial Conduct Authority.
Is there a gastric bypass post-surgery diet to follow?
Our expert team of dietitians will talk to you in detail about what foods you can eat after gastric bypass surgery, and help you make sure you’re getting all the nutrition you need. Generally, you’ll have to follow a more nutritious diet after a gastric bypass, since your portions will be smaller and fewer nutrients will be absorbed. It’s important you are managing a good protein intake, so our dietitians will advise you on this. Also, because you won’t be able to absorb as many minerals and vitamins after your gastric bypass, you’ll have to take supplements for life and will need regular blood tests to check for any nutritional deficiencies. Here at The Hospital Group, we offer a wide range of weight loss supplements to help you with your gastric bypass diet.

Next steps

How to get a gastric bypass: Your journey step by step.

Your first appointment

At The Hospital Group, it all starts with a telephone consultation, during which you'll have the chance to talk to one of our friendly surgeon assistants. Our consultation will include the reasons you're interested in gastric bypass surgery, how much it'll cost, the finance options which are available to you, and how much recovery time you’ll need. We'll also discuss potential surgery dates. Whenever you decide to book a surgery date, you can secure it for a minimum refundable deposit of £500.

The next step after this is to book a free weight loss consultation with our specialists.

Free consultation

All weight loss surgery involves two specialist consultations. The first is with a dedicated weight loss expert – either a nurse or dietitian. You can visit your local clinic, or we can carry it out via video chat. This first consultation will let us find out more about your weight loss goals and your medical history, and help us to determine if surgery will be the best course of action for you.
The consultation will also consider the results you both expect and hope to see, plus any risks and complications involved. You can trust our specialists to be extremely knowledgeable about your gastric bypass surgery, and they will answer any questions that you might have.
Happy to go ahead? You'll then have a consultation with your expert surgeon. The benefits and risks will again be explained, and your surgeon will also confirm if surgery is the right option. You'll then be referred to a clinic nurse for the assessments and tests needed before your procedure.

The gastric bypass procedure

Before the day of your operation, you'll be told about the specifics of the surgery, such as how long the procedure typically takes, and the types of anaesthetic used. The entire procedure itself is also explained to you at this point, so that nothing will ever be a surprise to you.
On the day of your gastric bypass, you'll meet your surgeon to discuss any final questions and you'll read through your consent form. You'll also have the chance to meet your surgical team before you go into theatre for your procedure.


You'll need to stay in hospital during the initial stages of your gastric bypass recovery, and it's not uncommon to feel swollen and in some pain. You don't have to worry, though - you'll have our friendly nursing team on hand to look after you and provide any painkillers you need.

Immediately following the operation, you'll be given intravenous drip hydration in order to maintain your fluid levels. You'll also need someone to drive you home when you're discharged, as the surgery is performed under general anaesthetic and its effects may take a while to wear off.

Rest assured that we'll take you through how best to take care of yourself once you're back at home. We have a 24/7 helpline, too, meaning that a member of the clinical team will be available for you to call for support at any time.


The gastric bypass is only part of your weight loss journey, and it's important to us that we stay with you every step of the way afterwards. That's why we offer the highest standards of aftercare and have a range of different packages available to support your ongoing weight loss. These can be discussed during your consultation.
No matter if you’ve had a mini or Roux-en-Y gastric bypass, your body will need time to heal afterwards. You will need to stay off work until you feel ready to return, and it's important to avoid any heavy lifting or strenuous activity for around six weeks. As every person is different, it may take you more or less time to fully recover.

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