Weight Loss Surgery

Gastric Sleeve

Everything you need to know about gastric sleeve weight loss surgery, from experts in bariatric surgery.

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What is the gastric sleeve?

The gastric sleeve (laparoscopic sleeve gastrectomy) is the world’s fastest-growing weight loss procedure. It has grown rapidly in popularity in recent years and now accounts for more procedures in the NHS than gastric band or gastric bypass surgery.

The gastric sleeve is a simple concept. We access the abdomen laparoscopically (keyhole surgery), cut the stomach along its length, and remove about 80%. After sleeve surgery, the food you eat will still enter and exit the stomach in the same place as it did before (unlike the gastric bypass) but you’ll have a much smaller stomach.

The sleeve helps you lose weight in two ways. It reduces the capacity of your stomach and it also changes some of the gut hormones, particularly ghrelin and GLP-1. The change in gut hormones, including changes to GLP1, changes and suppresses appetite. For this reason, we expect gastric sleeve patients to lose excess body weight quickly.

It’s important to note that your weight loss isn’t directly related to the size of your remaining stomach. The change to gut hormones will facilitate weight loss whether you have a relatively ‘tight’ or ‘loose’ sleeve.

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How the gastric sleeve works in detail

At a high level, we can say that the combination of restriction (a smaller stomach) and changes to the gut hormones are the cause.

When we look more closely, there are effects that we know about in relation to the change in gut hormones. 

  • Ghrelin – we know that when the sleeve is done the amount of ghrelin produced by the body reduces.

This will both reduce and change the appetite of the majority of patients so that about 90% are successful with sleeve surgery. Patients will often say that their taste for food changed immediately.

As with all weight loss surgery though, the key to long-term success is to embed the right diet and eating habits in the years immediately after surgery in order that you can sustain those behaviours long term, when we know the immediate benefits of the procedures will start to diminish. So, aftercare and support are just as important for sleeve patients as they are for those who have other weight loss procedures.

Clinics offering the Gastric Sleeve

Am I eligible for the gastric sleeve?

There are many factors to consider for eligibility but we generally offer the sleeve gastrectomy procedure to those with a minimum body mass index (BMI) of 35.

The eligibility criteria that apply in private healthcare are a little different than those that apply in the NHS.

The reason is that the NHS eligibility criteria that are set by NICE (the National Institute for Health and Clinical Excellence) have to balance the public health benefit with what the state can afford.

In the private sector, we are not faced with the same price restraints as patients are paying for their procedures. This means that we can make decisions based purely on the available scientific data. For that reason, we will generally consider patients with lower BMI than would be the case for the NHS.

The NICE guidelines state that patients will be eligible for bariatric surgery if they have a BMI above 40 or above 35 with at least one major co-morbidity. In addition, patients will need to follow and ‘pass’ a 6 – 12 month weight loss programme before they will be considered eligible for surgery. There will then usually be a waiting list.

The reality is that very few NHS Trusts apply these criteria and you may have read in the press that Trusts are applying their own, much tighter, selection criteria. This is because they do not have the resources needed to apply the NICE guidelines.

Some Trusts are limiting surgery to patients with a BMI over 50, to diabetics and/or to patients who don’t smoke.

At Healthier Weight, we generally consider sleeve surgery for patients with a BMI of 35 and above. You will need to have tried and failed with diet plans as a way to manage your weight and your weight will need to be harming your everyday life.

If you are of Asian ethnicity and/or you are a Type 2 diabetic we would consider surgery at a lower BMI. We will explain the eligibility criteria in more detail at your face-to-face consultation.

How long is Gastric sleeve surgery

Gastric sleeve surgery will usually last between 45 and 60 minutes. Usually 4, sometimes 5, small horizontal incisions will be made in the stomach through which the instruments are passed. These incisions will leave small scars that are usually about 5mm long, so very small.

You’ll stay in a hospital for a short period, usually 2 nights, and will then be discharged home where you’ll be encouraged to rest for at least 7 days to allow your body to recover. You should start to feel much more comfortable around 2 weeks after surgery.

How much weight will I lose with the gastric sleeve?

The primary reason most obese patients choose gastric sleeve is to lose weight. It’s a very powerful surgical procedure and most studies show average (mean) excess weight loss of 60-70%* over 2 years. Some studies show even better weight loss results but we think this is a reasonable expectation. One of the attractions is that the weight is usually lost as quickly, as the procedure reduces and changes appetite. You’ll see in our patient success stories section that people achieve spectacular results with the sleeve.

Of course, to maintain the weight loss for the long term it’s important to make changes to your food intake / healthy diet and regular exercise habits so that you can maintain your weight loss in later years should the ‘power’ of your sleeve begin to diminish. Other benefits are an improvement or a reduced risk of developing weight-related medical conditions such as type 2 diabetes and heart disease.

Michelle’s Transformation

Lost 10 Stone

“I wish that everybody who needed it got the opportunity to have it”                 

Charles’s Transformation

Lost 9.5 Stone

“I wouldn’t be here right now if it wasn’t for the amazing surgeons and support staff.”

Martin’s Transformation

Lost 10.5 Stone

“I have so much more freedom to do more things and seize any opportunity when they come.”

What are the health benefits of gastric sleeve surgery?

The gastric sleeve is the fastest-growing weight loss surgery procedure in the world because it delivers excellent weight loss results and improvements to health. The knock-on effect of both is that it also helps patients achieve an improved quality of life.

Here are the benefits you can expect from your sleeve surgery. These are taken from respected scientific journals and the relevant publications are shown at the foot of this page.

Type 2 Diabetes – The sleeve is an excellent procedure for diabetics and 80% of patients can expect a complete resolution of their symptoms

Raised Blood Pressure (Hypertension) – 85-90% of patients who are taking medication to reduce their blood pressure can expect to stop medication altogether.

Sleep Apnoea – Patients see improved sleep patterns and reduced fatigue. Over 85% of patients who use a CPAP machine will be able to stop.

Infertility and PCOS – A very important consideration for some sleeve patients is that they want to lose weight to start or grow their family. Over 90% of sleeve patients improve their underlying hormonal well-being and restore fertility.

Back Pain and Arthritis – An important consideration for many patients is that their weight is being impacted on their mobility and causing joint pain. The sleeve can help this by reducing the load that joints are bearing. Studies show that patients report increased mobility after sleeve surgery.

Mental Wellbeing – This is a very important benefit of the gastric sleeve procedure. Often, patients have been dealing with mental health issues associated with their weight for many years. Studies show that sleeve patients report a reduction in anxiety and depressive symptoms. They also report a significant improvement in overall quality of life. We pay great attention to mental health in our pre-operative assessment process. Evidence shows that suicide among weight loss surgery patients is higher than in the general population. This is a complex area and there will be many possible reasons for this. One is that some patients have developed a ‘dependency’ on solid foods and when that is removed it will transfer elsewhere sometimes to alcohol or drugs. Our pre-operative screening process is designed to ensure long-term mental well-being for our weight loss surgery patients. Our programme was developed by Dr Claire Parkes, a Psychologist.

Dyslipidaemia – There are other health benefits, for example in respect of Asthma and liver disease but we have not listed all of them here. If there is a health problem we have not listed that you wish to enquire about, please call us and we’ll be happy to discuss it with you.

What are the risks of gastric sleeve surgery?

As with any bariatric procedure, there are operative and long-term complications and risks associated with gastric sleeve obesity surgery but in experienced hands, the procedure is very safe and the risks associated with the surgery are relatively small. The operation itself is technically very simple as it does not involve any cutting or joining of the bowel, unlike some other weight loss procedures such as the gastric bypass, and this is reflected in its low rate of early complications of 3 – 5% (3:100 to 5:100) and the low mortality rate of 0.1 – 0.5% (1 in 1000 to 5 in 1000).

Gastric sleeve risks include:

  • Haemorrhage (bleeding)
  • Leaks from staple lines leading to infection
  • Adverse reactions to anaesthesia and/or medication
  • Blood clots (Deep vein thrombosis in the legs / Pulmonary embolus on the lungs)
  • Longer term, potential nutritional deficiency
  • Marginal ulcer
  • Narrowing of the stomach
  • Gastroesophageal Reflux

Read more about the common complications of gastric sleeve surgery

Gastric sleeve cost and finance

The fixed price of your gastric sleeve will vary depending on several factors including your location, your surgeon and any special treatment requirements that are identified at your consultation. For example, do we need to schedule a night in the high-dependency unit for you (this would only apply to patients with significant weight-related health issues).

We offer 2 finance packages to pay for your gastric sleeve procedure. Click below to compare monthly payments.

The importance of great aftercare is often underestimated when it comes to gastric sleeve. 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.

Gastric Sleeve Procedure

We access the abdomen laparoscopically (keyhole surgery), cut the stomach along its length, and remove about 80%

Dedicated Support

Our range of nutritionists, Health Coaches and support team are here to help every step of the way                  

Digital Tools

Videos and live classes on diet, fitness, retraining behaviours, body composition scales and activity tracker.  

Healthier Weight Starter Kit

Our inspiring before-and-after images capture the incredible weight loss journey of our patient’s Gastric Sleeve procedure. These images reflect the impressive transformations achieved through our procedure, highlighting the positive impact on their lives.

Gastric sleeve before and after photos

Gastric sleeve common FAQs

As with all surgical operations, there are associated risks and a gastric sleeve is a more invasive procedure than a gastric band which is why it is important to choose a specialist bariatric surgeon with considerable gastric sleeve experience. In the hands of a highly experienced Healthier Weight surgeon, the gastric sleeve is still a safe and effective procedure. Read more about our sleeve centres and surgeons here.

Due to the considerable amount of weight that gastric sleeve patients typically lose, it’s possible that you will experience some excess, loose or saggy skin. This most commonly occurs in the abdominal apron, or trunk area. The amount of excess skin you’ll be left with following a gastric sleeve operation varies and will depend upon your age and weight before the procedure. Generally, the heavier and older you are, the more likely you are to have excess skin. Younger patients tend not to have as much lax skin due to greater natural skin elasticity. 

On average we expect weight loss results for gastric sleeve patients to be approx 60-70% of their excess weight during the first two years, although most of the weight is lost during the first year. Some people will inevitably do better than this, and some not so well.

Most sleeve patients will stay in a hospital for 2 nights before going home. You should start to feel much more comfortable around 2 weeks after surgery, but it typically takes around 6 to 8 weeks for your stomach to heal completely. Read more about the recovery time.

Your diet will change following the weeks out of surgery, however, after week 5 you can eat most foods, provided they don’t cause you discomfort. However, because you will be consuming less food in general, it is important that you include foods that are rich in protein, but low in fat and sugar. We encourage you to eat vegetables, fruit, whole grains, lean meat and fish. You will be provided with detailed nutritional information following your gastric sleeve operation.

Image of consultant bariatric surgeon, Mr Rishi Singhal

All content on this page is reviewed by a multi-disciplinary team led by Prof Rishi Singhal.


*Surg Obes Relat Dis. 2011 Nov-Dec;7(6):749-59. doi: 10.1016/j.soard.2011.07.017. Epub 2011 Aug 10. Third International Summit: Current status of sleeve gastrectomy

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