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Gastric Bypass Surgery

We’re the UK’s most trusted weight loss & cosmetic surgery provider

Meet your new weight loss partner.

Gastric bypass surgery is a life-changing procedure that could help you lose weight, improve your health, and transform your entire lifestyle. Gastric bypass may be suitable if you have a BMI of 40 or more (or less but not lower than 30), or a BMI of 35 or more and suffer an obesity-related condition such as Type 2 Diabetes. 

Losing weight on your own can be extremely difficult, and gastric bypass surgery is proven to be a highly-effective weight loss procedure when combined with diet, exercise, and a general lifestyle change. A gastric bypass procedure could help you lose an average of 55-70% of excess weight after three years, according to the 2014 National Bariatric Surgery Registry Report.

The surgery involves the creation of a small stomach pouch, to reduce the size of your stomach, and re-routing the small intestine. This assists weight loss by restricting food intake, reducing hunger and the absorption of calories and nutrients. A general anaesthetic is required for gastric bypass and depending on your medical condition and individual needs, the surgery can take between 2 – 3 hours.

Our expert team will explain the procedure and help you decide whether it’s the right route for you and your weight loss journey. Get in touch with us today to learn more about gastric bypass surgery.

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Gastric bypass results

Your gastric bypass surgeon, nurses and dietitians are here to understand your weight loss goals and help you achieve them. See for yourself the results that other patients have achieved and the difference it’s made for them.

Why choose The Hospital Group for gastric bypass surgery?

The Hospital Group is the largest and most trusted UK provider of weight loss surgery, performing thousands of procedures every year.

When you’re putting your trust in a weight loss surgeon, only the most experienced will do. At The Hospital Group, we only select GMC-registered surgeons to work with us.

Our world-class facilities include our own state-of-the-art private hospital, Dolan Park in Worcestershire, and a wide network of clinics across the UK. Wherever you visit us, you’ll find a team that is dedicated to providing exceptional care, from your first consultation right through to the comprehensive aftercare we offer. When you start your journey with The Hospital Group, we’ll help you through every step.

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Gastric bypass surgery frequently asked questions

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When you’re deciding whether to have surgery, it’s reassuring to have all the facts. You’ll be able to ask any questions at your consultation, but here are some that our patients most frequently ask.

Gastric bypass FAQ's

This depends on the patient and the surgeon but usually gastric bypass operations take between 90 minutes and two hours if performed by keyhole surgery (almost always the case). If you are having your gastric band removed at the same time, the operation will usually take longer, but you can discuss this with your surgeon.


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This again depends on the patient and the surgeon, but usually you’ll need to stay in hospital for 2-3 nights, although sometimes you may be able to go home after one night.


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For the seriously obese, the benefits of the gastric bypass procedure tend to outweigh the risks. The benefits generally include: Improvements in risk factors for heart disease and cancer Up to 85% of patients with hypertension will be off medication (source: National Bariatric Surgery Registry Report 2014) Cholesterol levels will fall 80% ofType 2 diabetics will be off medication after 3 years (source: National Bariatric Surgery Registry Report 2014) Improvements in a range of conditions, including sleep apnoea, asthma, joint pain, arthritis, reflux, fatigue and shortness of breath Patients report less depression, improved self-esteem and confidence, along with an increased sense of wellbeing.


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After 2-3 months, most patients are back on a varied diet of solid food. However, some patients may struggle with certain textures of food 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. Often patients say that these symptoms help to discourage them from eating too much sugar, which can then enhance weight loss.


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As with any surgery, there can be operative and long-term complications and risks associated with gastric bypass, including: Bleeding Complications due to anaesthesia and medications Infections Blood clots on the lung Deep vein thrombosis Wound breakdown Leaks from the staple line Injury to the spleen Marginal ulcers.


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More details on gastric bypass surgery

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At The Hospital Group, we’re here to look after you. As UK market leaders in weight loss management, we offer advice you can trust, treatment based on your individual needs, and support throughout your journey with us. Here’s a step-by-step guide to what you can expect.

Gastric bypass details

We want you to make a fully informed decision before you go ahead with surgery, so we offer a private consultation at your local clinic free of charge. At your consultation, you’ll meet with a bariatric surgeon to discuss the weight loss options available and whether gastric bypass surgery is the most suitable procedure for your needs. You’ll be able to ask questions about all aspects of the surgery, from aftercare and dietary changes to the results you can expect. You’ll also meet your patient care coordinator, who will be with you every step of the journey. They will give you a personal quotation of costs and information about finance options, the expected timescale, our surgical facilities and door-to-door transport services.


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At your consultation, you can book your surgery if you feel ready, but there’s no obligation to go ahead.Bariatric surgery is a big step and you may want to take time to do more research and think about your decision. We’ll give you a patient information booklet, which provides comprehensive information on your weight loss procedure, aftercare and dietary guidelines. This is an important resource and we require patients to read the detailed information it contains. You’ll also find lots of helpful information here on our website – you can read about our surgeons’ qualifications, THG’s weight loss management expertise and inspiring stories from some of our patients. Our patient care coordinators are available to discuss any concerns you may have. And when you feel ready, they can book you in for your procedure. We also have a 14-day ‘cooling off’ period in place, which means that if you change your mind about the procedure after booking within that period, you will not be charged.


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On the day of your surgery, your medical team will make your experience as comfortable as possible and you’ll meet your surgeon again before the procedure. Gastric bypass surgery is carried out under general anaesthetic. There are several varieties of bypass, but all involve dividing the stomach to create a small stomach pouch and then attaching a section of the small intestine to the pouch, therefore bypassing part of the small intestine. The smaller stomach pouch restricts the amount of food you can eat, and is designed to make you feel full after smaller meals. It also aims to drop appetite hormone levels to reduce your appetite. Bypassing part of the small intestine reduces the amount of calories you absorb from food, as well as vitamins and minerals and so supplements are required for life. Gastric bypass surgery is non-reversible.


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We’ll be here throughout the recovery process to help you recuperate quickly. For gastric bypass surgery you’ll need to stay in the hospital where your surgery has taken place for 2-4 nights, depending on your procedure. Each patient is given a personalised care plan, developed on the advice of their surgeon. All THG hospitals are equipped to the highest standards of clinical care and patient comfort.


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When you have a gastric bypass, the surgery is only the start of your journey. At THG, we offer a full package of aftercare support to help you achieve your weight loss goals. You’ll benefit from the following aftercare for 2 years: Access to a dedicated weight loss support team who can help with booking appointments, emotional support, practical ideas and solutions Specialist support from a bariatric surgeon, dietitians and nurses Surgical cover for 6 months 24-hour emergency telephone helpline.


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