{"id":12821,"date":"2026-11-15T10:00:00","date_gmt":"2026-11-15T09:00:00","guid":{"rendered":"https:\/\/www.medespoir.ch\/blog\/?p=12821"},"modified":"2026-11-15T10:00:00","modified_gmt":"2026-11-15T09:00:00","slug":"gastric-sleeve-in-detail-technique-long-term-results","status":"publish","type":"post","link":"https:\/\/www.medespoir.ch\/blog\/gastric-sleeve-in-detail-technique-long-term-results\/","title":{"rendered":"Gastric sleeve in detail: how is it done, what happens after ten years, and who is it right for?"},"content":{"rendered":"<p><strong>In short:<\/strong> the gastric sleeve (sleeve gastrectomy) removes a large part of the stomach by keyhole surgery and turns what remains into a narrow tube. It works through restriction and, above all, through hormonal changes that reduce hunger. It is the most performed weight-loss operation in the world. The longest randomised trials, including the Swiss SM-BOSS study published in 2025, show that it gives substantial weight loss that is largely maintained after ten years, although the gastric bypass does somewhat better on weight and clearly better on reflux, and about three in ten sleeve patients in SM-BOSS needed a conversion to another anatomy over that period. The sleeve suits many people with severe obesity, especially when absorption of food and medicines must be preserved, but it is usually not the best choice for people with significant reflux. In Switzerland, basic insurance covers it when the criteria of the Swiss obesity surgery society are met.<\/p>\n<p><em>This article is general information. It does not replace advice from your surgeon, your obesity team or your doctor.<\/em><\/p>\n<p>Our guide on <a href=\"https:\/\/www.medespoir.ch\/blog\/choosing-bariatric-surgery-switzerland-sleeve-bypass\/\">choosing between sleeve, bypass, band and balloon<\/a> compares the operations and explains the Swiss eligibility criteria. Here we look at the sleeve alone, in depth: how it is done, how it works, what long-term studies show, what can go wrong and for whom it is the right tool.<\/p>\n<h2 id=\"contents\">Contents<\/h2>\n<ul>\n<li><a href=\"#news\">What do the latest long-term studies show?<\/a><\/li>\n<li><a href=\"#what\">What exactly is a gastric sleeve?<\/a><\/li>\n<li><a href=\"#technique\">How is the operation performed?<\/a><\/li>\n<li><a href=\"#how\">How does a sleeve make you lose weight?<\/a><\/li>\n<li><a href=\"#results\">How much weight will I lose, and will it last?<\/a><\/li>\n<li><a href=\"#health\">What happens to diabetes, blood pressure and sleep apnoea?<\/a><\/li>\n<li><a href=\"#reflux\">Reflux, oesophagitis and Barrett&rsquo;s oesophagus<\/a><\/li>\n<li><a href=\"#early\">Early recovery and complications<\/a><\/li>\n<li><a href=\"#late\">Long-term issues: nutrition, regain and conversion<\/a><\/li>\n<li><a href=\"#daily\">Living with a sleeve day to day<\/a><\/li>\n<li><a href=\"#myths\">Common myths about the sleeve<\/a><\/li>\n<li><a href=\"#team\">How do I choose a bariatric team?<\/a><\/li>\n<li><a href=\"#who\">Who is the sleeve right for?<\/a><\/li>\n<li><a href=\"#glp1\">The sleeve in the age of weight-loss injections<\/a><\/li>\n<li><a href=\"#swiss\">Coverage and follow-up in Switzerland<\/a><\/li>\n<li><a href=\"#abroad\">A sleeve in Tunisia: what changes<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ul>\n<h2 id=\"news\">What do the latest long-term studies show?<\/h2>\n<p>For years, critics said that sleeve gastrectomy spread faster than the evidence on its long-term results. That gap has narrowed, thanks largely to two randomised trials that have now followed patients for ten years or more.<\/p>\n<p>The most relevant for readers in Switzerland is <strong>SM-BOSS<\/strong> (Swiss Multicenter Bypass or Sleeve Study). Between 2007 and 2011, 217 patients with severe obesity were randomly assigned to sleeve gastrectomy or Roux-en-Y gastric bypass at four bariatric centres in Switzerland, including Basel and Zurich. The ten-year results were published in <em>JAMA Surgery<\/em> in April 2025. Patients had an average age of 42.5 and an average BMI of 43.9 at the start. Complete ten-year follow-up was available for 65.4% of them. The main findings:<\/p>\n<ul>\n<li>Average total weight loss after ten years was 25.5% after the sleeve and 27.7% after the bypass, a difference that was not statistically significant.<\/li>\n<li>Excess BMI loss was 60.6% after the sleeve and 65.2% after the bypass in the intention-to-treat analysis (not significant), and significantly higher after the bypass in the per-protocol analysis.<\/li>\n<li>Sleeve patients had significantly more new reflux disease than bypass patients.<\/li>\n<li>29.9% of sleeve patients underwent conversion to another anatomy because of insufficient weight loss or reflux, compared with 5.5% after bypass.<\/li>\n<\/ul>\n<p>The Finnish <strong>SLEEVEPASS<\/strong> trial, published in <em>JAMA Surgery<\/em> in 2022, followed 240 patients for ten years. Excess weight loss was somewhat greater after bypass, but the authors concluded that both operations gave good and sustainable weight loss. There was no significant difference in remission of type 2 diabetes, dyslipidaemia or sleep apnoea; hypertension remission was better after bypass. Oesophagitis was more frequent after the sleeve (31% vs 7%), but Barrett&rsquo;s oesophagus was found in 4% of patients after both operations. The overall reoperation rate was similar, 15.7% after sleeve and 18.5% after bypass.<\/p>\n<p>The message from both trials is consistent: the sleeve is an effective long-term operation, but it is not identical to the bypass, and reflux is its main weak point.<\/p>\n<h2 id=\"what\">What exactly is a gastric sleeve?<\/h2>\n<p>A sleeve gastrectomy, also called vertical or longitudinal gastrectomy, removes the larger, outer part of the stomach along its length. Medespoir&rsquo;s <a href=\"https:\/\/www.medespoir.ch\/sleeve.php\">sleeve page<\/a> describes the removal of about two thirds of the stomach, leaving a tube-shaped stomach. The removed portion includes most of the fundus, the part that produces the majority of ghrelin, the hunger hormone. The entrance (oesophagus junction) and exit (pylorus) of the stomach are preserved, and food follows its normal route through the intestine.<\/p>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Gastric sleeve<\/th>\n<th>Roux-en-Y gastric bypass<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>What is changed<\/td>\n<td>Stomach reduced to a tube<\/td>\n<td>Small stomach pouch connected lower down in the small intestine<\/td>\n<\/tr>\n<tr>\n<td>Food route<\/td>\n<td>Normal<\/td>\n<td>Bypasses most of the stomach, duodenum and part of the small intestine<\/td>\n<\/tr>\n<tr>\n<td>Absorption of nutrients and medicines<\/td>\n<td>Largely preserved<\/td>\n<td>Reduced for some nutrients; some medicines absorbed differently<\/td>\n<\/tr>\n<tr>\n<td>Reversible?<\/td>\n<td>No; the removed stomach is gone<\/td>\n<td>Technically reversible, rarely done<\/td>\n<\/tr>\n<tr>\n<td>Reflux<\/td>\n<td>Can worsen or appear<\/td>\n<td>Usually improves; often used to treat reflux<\/td>\n<\/tr>\n<tr>\n<td>Ten-year weight loss (SM-BOSS)<\/td>\n<td>About a quarter of total body weight on average<\/td>\n<td>Similar total weight loss; somewhat better excess BMI loss per protocol<\/td>\n<\/tr>\n<tr>\n<td>Endoscopic access to the stomach and bile ducts later<\/td>\n<td>Preserved<\/td>\n<td>Difficult<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Is the sleeve the same as a gastric band or a balloon?<\/h3>\n<p>No. A band is a silicone ring placed around the top of the stomach and can be removed; a balloon is a temporary device placed in the stomach by endoscopy. The sleeve permanently removes part of the stomach. It is also different from endoscopic sleeve gastroplasty, which folds and stitches the stomach from the inside without removing any of it; that procedure is newer, less invasive and generally gives smaller weight loss.<\/p>\n<h3>How common is the sleeve?<\/h3>\n<p>It is the most performed bariatric operation in the world. In the International Federation for the Surgery of Obesity&rsquo;s (IFSO) worldwide survey for 2020\u20132021, published in 2024, the sleeve was the most performed procedure worldwide and in every IFSO region, with about 352,000 sleeve operations reported in 2021 against about 160,000 Roux-en-Y bypasses.<\/p>\n<h2 id=\"technique\">How is the operation performed?<\/h2>\n<p>The sleeve is performed by laparoscopy (keyhole surgery) under general anaesthesia. Medespoir&rsquo;s obesity surgery guide gives a duration of about one to two hours.<\/p>\n<ol>\n<li><strong>Access:<\/strong> the surgeon makes several small incisions in the abdomen, inflates it with gas and inserts a camera and instruments.<\/li>\n<li><strong>Freeing the stomach:<\/strong> the blood vessels along the outer curve of the stomach are sealed and divided to free it.<\/li>\n<li><strong>Calibration:<\/strong> a tube (bougie) is passed through the mouth into the stomach along its inner curve. It sets the width of the future sleeve and protects against making it too narrow.<\/li>\n<li><strong>Stapling:<\/strong> a stapler cuts and seals the stomach along the bougie, from a few centimetres above the pylorus up to the angle near the oesophagus. Several staple cartridges are used.<\/li>\n<li><strong>Checks:<\/strong> the staple line is inspected for bleeding and often tested for leaks. Some surgeons reinforce it.<\/li>\n<li><strong>Hiatal hernia:<\/strong> if a hiatal hernia is present, many surgeons repair it during the same operation, because it promotes reflux.<\/li>\n<li><strong>Removal:<\/strong> the removed part of the stomach is taken out through one of the incisions.<\/li>\n<\/ol>\n<h3>Why do technical details matter?<\/h3>\n<p>Because they influence results and complications. A sleeve that is too wide may give less weight loss; one that is too narrow, twisted or kinked can cause vomiting and reflux; a sleeve starting too close to the pylorus may empty differently. Surgeons have different preferences on bougie size, distance from the pylorus and staple line reinforcement, and there is no single \u00ab\u00a0correct\u00a0\u00bb recipe. What matters is a team that does the operation often and audits its results.<\/p>\n<h3>How painful is a sleeve, and what do the scars look like?<\/h3>\n<p>Pain after keyhole surgery is usually moderate and well controlled with regular painkillers during the first days. Many people feel more discomfort from the gas used to inflate the abdomen, often felt in the shoulders, than from the incisions. The scars are several small cuts of about one to two centimetres, plus one slightly larger where the stomach is removed. They fade over months and are usually discreet, though they can stay visible on darker or keloid-prone skin.<\/p>\n<h3>What tests are done before a sleeve?<\/h3>\n<p>Usually blood tests, an assessment by a dietitian and a psychologist or psychiatrist, screening for sleep apnoea, a heart and lung check if needed and, importantly, an upper endoscopy (gastroscopy). Medespoir&rsquo;s guide notes that the choice between sleeve and bypass depends heavily on this endoscopy: proven oesophagitis argues for a bypass. Our article on <a href=\"https:\/\/www.medespoir.ch\/blog\/preparing-for-bariatric-surgery-switzerland-checklist\/\">preparing for bariatric surgery<\/a> explains the full checklist.<\/p>\n<h2 id=\"how\">How does a sleeve make you lose weight?<\/h2>\n<p>The obvious answer, \u00ab\u00a0a smaller stomach holds less food\u00a0\u00bb, is only part of the story.<\/p>\n<ul>\n<li><strong>Restriction:<\/strong> the tube fills quickly, and you feel full after small portions.<\/li>\n<li><strong>Less ghrelin:<\/strong> removing the fundus reduces the main source of ghrelin, so hunger decreases.<\/li>\n<li><strong>Faster gastric emptying:<\/strong> food reaches the intestine sooner, which increases the release of gut hormones such as GLP-1 and PYY that promote satiety and improve blood sugar control.<\/li>\n<li><strong>Changes in food preferences:<\/strong> many people find they want smaller amounts and tolerate fatty or sweet foods less.<\/li>\n<\/ul>\n<p>These effects are strongest in the first months, which is why the first year is the key window to build lasting habits. Over time, the sleeve can stretch somewhat and hunger can partly return, which is one reason weight regain occurs in some people.<\/p>\n<h2 id=\"results\">How much weight will I lose, and will it last?<\/h2>\n<p>Results vary widely between individuals. In SM-BOSS, the average total weight loss ten years after a sleeve was about a quarter of the starting weight. In SLEEVEPASS, the median excess weight loss at ten years was 43.5% after sleeve, with an extremely wide range. Medespoir&rsquo;s guide notes that most of the weight is lost in the first year, with a final plateau reached around a year and a half after surgery.<\/p>\n<table>\n<thead>\n<tr>\n<th>Time after surgery<\/th>\n<th>What usually happens<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Months 0 to 3<\/td>\n<td>Rapid loss; liquid then soft diet; fatigue; hair shedding may begin around month 3<\/td>\n<\/tr>\n<tr>\n<td>Months 3 to 12<\/td>\n<td>Steady loss; return to normal-texture food in small portions; exercise becomes easier<\/td>\n<\/tr>\n<tr>\n<td>Months 12 to 18<\/td>\n<td>Loss slows and reaches a plateau<\/td>\n<\/tr>\n<tr>\n<td>Years 2 to 5<\/td>\n<td>Some regain is common; the habits built in year one make the difference<\/td>\n<\/tr>\n<tr>\n<td>Year 10<\/td>\n<td>In SM-BOSS, about a quarter of starting weight lost on average; about three in ten patients had been converted to another operation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>What do \u00ab\u00a0excess weight loss\u00a0\u00bb and \u00ab\u00a0total weight loss\u00a0\u00bb mean?<\/h3>\n<p>Studies report results in different ways, which can be confusing. Total weight loss is the share of your starting body weight that you lose: someone who goes from 130 to 97 kilograms has lost about a quarter of their weight. Excess weight loss, or excess BMI loss, is the share of the weight above a reference \u00ab\u00a0normal\u00a0\u00bb BMI, usually 25, that you lose; if that person is 1.70 metres tall, they have lost about 57% of their excess weight. Both measures are valid, but they produce very different-looking percentages. When a clinic quotes a result, ask which measure it uses and over how many years.<\/p>\n<h3>What predicts better results?<\/h3>\n<p>Regular follow-up, dietary changes maintained over years, physical activity, adequate protein intake, management of emotional eating, avoidance of high-calorie liquids and, in some people, medical treatment for regain. Starting BMI, age, diabetes duration and genetics also influence results, and some factors are outside your control.<\/p>\n<h3>Is some weight regain normal?<\/h3>\n<p>Yes. Most people regain some weight after the lowest point. What matters is whether the regain is limited and whether health benefits are maintained. Significant regain should be discussed early with your team; dietary support, medication or, in some cases, revision surgery are options. Our article on <a href=\"https:\/\/www.medespoir.ch\/blog\/revision-bariatric-surgery-switzerland-sleeve-to-bypass\/\">revision bariatric surgery<\/a> covers conversion from sleeve to bypass.<\/p>\n<p><strong>Considering a sleeve?<\/strong> Request a <a href=\"https:\/\/www.medespoir.ch\/devis.php\">free, personalised quote<\/a>. A sleeve in Tunisia is significantly cheaper than in Switzerland; the exact price is given in the quote, sent within 48 hours and without commitment.<\/p>\n<h2 id=\"health\">What happens to diabetes, blood pressure and sleep apnoea?<\/h2>\n<p>The sleeve is a metabolic operation as well as a weight-loss operation. Blood sugar often improves within days or weeks, before major weight loss, because of the hormonal changes described above. Sleep apnoea, joint pain, fatty liver, fertility in women with polycystic ovary syndrome and quality of life often improve as weight falls.<\/p>\n<p>The long-term trials give a more nuanced picture. In SLEEVEPASS, ten years after surgery, type 2 diabetes was in remission in 26% of sleeve patients and 33% of bypass patients, a difference that was not statistically significant, while hypertension remission was better after bypass. Medespoir&rsquo;s guide notes that the bypass has the strongest data for metabolic action on diabetes. For someone with long-standing type 2 diabetes treated with insulin, the bypass is often preferred; our guide on <a href=\"https:\/\/www.medespoir.ch\/blog\/type-2-diabetes-metabolic-surgery-switzerland\/\">type 2 diabetes and metabolic surgery<\/a> explains this choice in detail.<\/p>\n<h3>Can I stop my medicines after a sleeve?<\/h3>\n<p>Never on your own. Doses of diabetes and blood pressure medicines often need to be reduced quickly after surgery to avoid low blood sugar or low blood pressure. Your doctor adjusts them step by step and checks regularly.<\/p>\n<h2 id=\"reflux\">Reflux, oesophagitis and Barrett&rsquo;s oesophagus<\/h2>\n<p>Reflux is the sleeve&rsquo;s best-documented long-term drawback. The tube-shaped stomach has higher internal pressure, and the anatomy of the junction with the oesophagus can change, which favours acid reflux. Some people with reflux before surgery improve after a sleeve, but many do not, and some develop new reflux.<\/p>\n<ul>\n<li>In SM-BOSS, new reflux disease was significantly more common after the sleeve than after the bypass.<\/li>\n<li>In SLEEVEPASS, endoscopy at ten years found oesophagitis in 31% of sleeve patients and 7% of bypass patients.<\/li>\n<li>In the same trial, Barrett&rsquo;s oesophagus, a change in the lining of the oesophagus that can rarely progress to cancer, was found in 4% after both operations, much lower than some earlier studies had suggested.<\/li>\n<\/ul>\n<h3>What does this mean for me?<\/h3>\n<p>If you have significant reflux, a hiatal hernia or oesophagitis on the pre-operative endoscopy, a bypass is often the better choice. If you have a sleeve, report heartburn, regurgitation, a chronic cough or difficulty swallowing to your team. Reflux is usually treated first with lifestyle measures and acid-reducing medicines. Many experts recommend periodic endoscopy after a sleeve, especially if symptoms persist, and severe reflux that does not respond to treatment is one of the main reasons for conversion to a bypass.<\/p>\n<h2 id=\"early\">Early recovery and complications<\/h2>\n<p>Most people walk on the day of surgery or the day after and leave hospital within a few days. Medespoir&rsquo;s guide indicates a return to work generally within two to four weeks, depending on the job.<\/p>\n<h3>What is the diet after a sleeve?<\/h3>\n<p>A stepwise progression: clear fluids, then liquid and pur\u00e9ed foods, then soft foods, then a normal texture in small portions, over about six to eight weeks. Protein comes first at every meal, liquids are taken between meals rather than with them, and eating is slow. Our guide on <a href=\"https:\/\/www.medespoir.ch\/blog\/life-after-bariatric-surgery-switzerland\/\">life after bariatric surgery<\/a> describes the phases, vitamins and long-term eating habits.<\/p>\n<h3>What are the serious early complications?<\/h3>\n<ul>\n<li><strong>Staple line leak:<\/strong> rare but the most feared complication, usually near the top of the sleeve. Signs include a fast heart rate, fever, increasing abdominal or shoulder pain and feeling unwell in the days or weeks after surgery. It requires urgent treatment, often endoscopic, sometimes surgical.<\/li>\n<li><strong>Bleeding:<\/strong> from the staple line or inside the abdomen, mainly in the first 48 hours.<\/li>\n<li><strong>Stricture or twist:<\/strong> narrowing or kinking of the sleeve causing vomiting and inability to drink; often treated with endoscopic dilation.<\/li>\n<li><strong>Blood clots:<\/strong> in the legs or lungs; prevented by early walking, compression and blood-thinning injections.<\/li>\n<li><strong>Portal or mesenteric vein thrombosis:<\/strong> rare clots in the abdominal veins causing abdominal pain weeks after surgery.<\/li>\n<li><strong>Dehydration:<\/strong> because drinking enough is difficult at first.<\/li>\n<\/ul>\n<h3>Which warning signs require urgent help?<\/h3>\n<p>A pulse that stays fast at rest, fever, increasing pain, shortness of breath, chest pain, persistent vomiting, inability to keep fluids down, black stools or vomiting blood. Contact your surgical team immediately or go to an emergency department, saying that you have had a sleeve. Our article on <a href=\"https:\/\/www.medespoir.ch\/blog\/bariatric-surgery-complications-warning-signs-switzerland\/\">complications and warning signs<\/a> goes into detail.<\/p>\n<h2 id=\"late\">Long-term issues: nutrition, regain and conversion<\/h2>\n<h3>Do I need vitamins for life after a sleeve?<\/h3>\n<p>Yes. Even though absorption is largely preserved, you eat much less, and the removed stomach produced acid and intrinsic factor needed for iron and vitamin B12 absorption. Medespoir&rsquo;s guide lists iron, vitamin B12, vitamin D, calcium and folate as the main supplements after a sleeve, with lighter requirements than after a bypass, and recommends blood tests at scheduled intervals and then once a year for life. Fatigue and hair loss are often the first signs of deficiency.<\/p>\n<h3>Is hair loss after a sleeve permanent?<\/h3>\n<p>Usually not. Diffuse shedding around three to six months after surgery is common and linked to rapid weight loss, surgical stress and sometimes low protein or iron intake. It generally recovers within months. Persistent hair loss should prompt checks of iron, zinc, protein and thyroid.<\/p>\n<h3>Can gallstones form after a sleeve?<\/h3>\n<p>Rapid weight loss increases the risk of gallstones. Some teams prescribe a medicine to reduce this risk during the first months. Pain in the upper right abdomen after meals, fever or yellowing of the skin need medical review.<\/p>\n<h3>What if the sleeve stops working?<\/h3>\n<p>Insufficient weight loss, significant regain or troublesome reflux can lead to discussion of a revision. In SM-BOSS, about three in ten sleeve patients had been converted to another anatomy after ten years. The most common conversion is to a Roux-en-Y gastric bypass, which treats reflux and can give additional weight loss. Other options exist, and medical treatment for weight regain is increasingly used before or instead of surgery.<\/p>\n<h3>Can I get pregnant after a sleeve?<\/h3>\n<p>Yes, and fertility often improves with weight loss. Most teams advise waiting until weight has stabilised, usually 12 to 18 months after surgery, and planning pregnancy with your team so that vitamins and weight gain are monitored. Contraception is important in the meantime. Medespoir has a page on <a href=\"https:\/\/www.medespoir.ch\/grossesse-apres-sleeve.php\">pregnancy after a sleeve<\/a>.<\/p>\n<h2 id=\"daily\">Living with a sleeve day to day<\/h2>\n<p>The operation is one day; living with a sleeve is every day after it. A few habits make the biggest difference, and most teams teach them before surgery.<\/p>\n<ul>\n<li><strong>Protein first:<\/strong> start each meal with the protein portion (meat, fish, eggs, dairy, tofu, legumes) to protect muscle mass during rapid weight loss.<\/li>\n<li><strong>Small plates, slow pace:<\/strong> meals of about 20 to 30 minutes, small bites, thorough chewing, and stopping at the first sign of fullness.<\/li>\n<li><strong>Drinks apart from meals:<\/strong> drinking with food fills the sleeve and pushes food through faster; most teams advise waiting around half an hour before and after eating.<\/li>\n<li><strong>Enough fluid:<\/strong> sipping regularly through the day, because dehydration is a common reason for feeling unwell in the first weeks.<\/li>\n<li><strong>Caution with fizzy drinks:<\/strong> carbonated drinks can cause discomfort and bloating, especially early on.<\/li>\n<li><strong>Watch liquid calories:<\/strong> sweet drinks, milkshakes, alcohol and snacks that \u00ab\u00a0melt\u00a0\u00bb pass easily through a sleeve and can undo its effect.<\/li>\n<li><strong>Tablets and medicines:<\/strong> large tablets can be hard to swallow at first; ask whether medicines can be crushed, split or replaced by liquid forms. Ask before taking anti-inflammatory painkillers regularly, as they can irritate the stomach.<\/li>\n<\/ul>\n<h3>Can dumping syndrome occur after a sleeve?<\/h3>\n<p>It is best known after a bypass, but because a sleeve empties faster than a normal stomach, some people also experience dumping symptoms after sugary or very rich foods: palpitations, sweating, dizziness, cramps or diarrhoea shortly after eating, or low blood sugar one to three hours later. Smaller, protein-rich meals and avoiding fast sugars usually help. If you have repeated episodes of shakiness or confusion after meals, tell your team.<\/p>\n<h3>When can I exercise after a sleeve?<\/h3>\n<p>Walking starts immediately. Light cardio is usually possible after a few weeks, and strength training and more intense sport after about six weeks, depending on your surgeon&rsquo;s advice and how the wounds heal. Regular exercise, particularly resistance training, helps preserve muscle during rapid weight loss, improves fitness and is one of the factors most consistently associated with keeping weight off. Many people in Switzerland find that hiking, cycling or swimming, impossible or painful before surgery, become part of their routine within the first year.<\/p>\n<h3>What about loose skin after a sleeve?<\/h3>\n<p>Substantial weight loss often leaves excess skin on the abdomen, arms, thighs, breasts or face. Its extent depends on how much weight is lost, age, genetics and skin quality. Body-contouring surgery is generally considered once weight has been stable for some months, often 12 to 18 months after the sleeve or later. In Switzerland, basic insurance covers some skin-removal operations only when strict medical criteria are met, for example recurrent skin infections, and requires prior approval. Our guide on <a href=\"https:\/\/www.medespoir.ch\/blog\/life-after-bariatric-surgery-switzerland\/\">life after bariatric surgery<\/a> discusses the options.<\/p>\n<h2 id=\"myths\">Common myths about the sleeve<\/h2>\n<h3>\u00ab\u00a0The stomach grows back\u00a0\u00bb<\/h3>\n<p>It does not regrow the part that was removed. The remaining sleeve can stretch somewhat over the years, which allows larger portions, but it does not return to its original size. Eating habits matter more than the stretching itself.<\/p>\n<h3>\u00ab\u00a0After a sleeve, you cannot regain weight\u00a0\u00bb<\/h3>\n<p>Some regain is common, and significant regain happens in a minority. The sleeve is a powerful tool that reduces hunger and portion size, but it does not prevent grazing, liquid calories or emotional eating. Long-term follow-up exists precisely to catch regain early.<\/p>\n<h3>\u00ab\u00a0The sleeve is the easy way out\u00a0\u00bb<\/h3>\n<p>Obesity is a chronic disease with strong biological drivers, and surgery is one of the most effective treatments. Living with a sleeve requires lifelong supplements, follow-up and changed eating habits. Many patients describe it as the opposite of easy, but worth it.<\/p>\n<h3>\u00ab\u00a0A sleeve is the same as a gastric band\u00a0\u00bb<\/h3>\n<p>No. A band is an adjustable device placed around the stomach and can be removed; it is now rarely used. A sleeve permanently removes part of the stomach and acts mainly through hormones and reduced hunger.<\/p>\n<h2 id=\"team\">How do I choose a bariatric team?<\/h2>\n<p>The quality of the team matters as much as the choice of operation. Useful questions to ask:<\/p>\n<ul>\n<li>How many sleeves and bypasses do you perform each year, and what are your complication and readmission rates?<\/li>\n<li>Will I have a gastroscopy before surgery, and how will the result influence the choice of operation?<\/li>\n<li>Do you check for and repair hiatal hernias during the sleeve?<\/li>\n<li>Who follows me after surgery: dietitian, doctor, psychologist? For how many years?<\/li>\n<li>What happens if I have reflux, regain weight or need a revision later?<\/li>\n<li>Which vitamins will I take, and how often will my blood be checked?<\/li>\n<li>Whom do I call at night or at the weekend if I feel unwell?<\/li>\n<\/ul>\n<p>In Switzerland, centres recognised by the SMOB meet defined quality requirements and run structured follow-up. Abroad, ask for the same information in writing, and make sure the plan for follow-up in Switzerland is concrete before you travel.<\/p>\n<h2 id=\"who\">Who is the sleeve right for?<\/h2>\n<p>The sleeve is a strong option for many people with severe obesity. It is often favoured in the following situations:<\/p>\n<ul>\n<li>No significant reflux, hiatal hernia or oesophagitis on endoscopy.<\/li>\n<li>Need to preserve normal absorption of medicines, for example immunosuppressants after an organ transplant, some psychiatric or epilepsy medicines, or when future treatments require reliable absorption.<\/li>\n<li>Inflammatory bowel disease or previous extensive abdominal surgery that makes intestinal rerouting difficult.<\/li>\n<li>Very high BMI, where a sleeve can be a first step before a second operation if needed.<\/li>\n<li>Preference for an operation without intestinal bypass and with simpler supplementation.<\/li>\n<li>Need for future endoscopic access to the stomach or bile ducts.<\/li>\n<\/ul>\n<h3>When is the sleeve usually not the best choice?<\/h3>\n<ul>\n<li>Significant reflux disease, oesophagitis or Barrett&rsquo;s oesophagus.<\/li>\n<li>A large hiatal hernia.<\/li>\n<li>Long-standing type 2 diabetes requiring insulin, where a bypass may offer more metabolic benefit.<\/li>\n<li>Frequent consumption of high-calorie liquids or grazing, which a sleeve controls less well.<\/li>\n<\/ul>\n<p>These are tendencies, not absolute rules. The choice should be made with an experienced team after a full assessment, including endoscopy.<\/p>\n<h3>Who decides between sleeve and bypass?<\/h3>\n<p>The decision is shared between you and the multidisciplinary team: surgeon, endocrinologist or internist, dietitian and psychologist. Your preferences matter, but they should be informed by your anatomy, reflux, health conditions and medicines. Medespoir&rsquo;s guide makes the same point: the pre-operative endoscopy often settles the question.<\/p>\n<h3>Is there an age limit for a sleeve?<\/h3>\n<p>There is no fixed upper age, but the Swiss obesity surgery society (SMOB) asks teams to weigh surgical risks and life expectancy carefully in people over 65, who should be operated on only in reference centres. Adolescents can be considered under much stricter conditions in specialised centres.<\/p>\n<h2 id=\"glp1\">The sleeve in the age of weight-loss injections<\/h2>\n<p>Weight-loss medicines based on GLP-1, such as semaglutide (Wegovy) and tirzepatide (Mounjaro), have changed the conversation. In Switzerland, Wegovy has been on the list of reimbursed medicines (Spezialit\u00e4tenliste) since 1 March 2024, with strict limitations. According to a position paper published in January 2026 by the Swiss association of dietitians (SVDE) and the Alliance Adipositas Schweiz (ALLOB), Mounjaro was added on 1 January 2026, and reimbursement is linked to accompanying nutritional counselling.<\/p>\n<h3>Do injections replace the sleeve?<\/h3>\n<p>Not for everyone. The injections are effective for many people, but they must generally be continued to maintain the effect, they have side effects and limitations, and their long-term use over decades is still being studied. Surgery offers a one-time intervention with ten-year data. For people with very severe obesity or serious complications, surgery remains a central option. The two are increasingly combined: medicines can be used before surgery to reduce risk, or after surgery to treat weight regain.<\/p>\n<h3>Can I take a GLP-1 medicine after a sleeve?<\/h3>\n<p>Yes, under medical supervision, particularly for weight regain or insufficient loss. Side effects such as nausea may be more noticeable with a small stomach, and the dose should be increased carefully. Reimbursement depends on the current limitations.<\/p>\n<h2 id=\"swiss\">Coverage and follow-up in Switzerland<\/h2>\n<p>In Switzerland, basic insurance (KVG\/LAMal) covers bariatric surgery, including the sleeve, when Annex 1 of the health care benefits ordinance (KLV\/OPAS) and the SMOB guidelines are respected. In brief, as explained in our <a href=\"https:\/\/www.medespoir.ch\/blog\/choosing-bariatric-surgery-switzerland-sleeve-bypass\/\">guide to choosing bariatric surgery<\/a>: a BMI of 35 or more, two years of adequate weight-reduction treatment that failed, and surgery in line with the SMOB guidelines, normally in a recognised centre. Your deductible and co-payment apply.<\/p>\n<h3>What does follow-up look like in Switzerland?<\/h3>\n<p>Follow-up is lifelong. In the first year, visits are frequent, with the surgeon, the dietitian and the doctor managing your medicines. Blood tests check for deficiencies. After that, an annual check with blood tests is the minimum. Recognised centres organise this follow-up and keep records for quality control. Support groups exist in many cantons and can help with motivation and practical questions.<\/p>\n<h3>How long does the preparation take in Switzerland?<\/h3>\n<p>The SMOB guidelines require a structured preparation period of at least three months between the first contact with the centre and the operation, and longer if nutritional knowledge, reliability or attendance at follow-up are in doubt. In practice, gathering the documentation of previous weight-loss treatment, the medical assessments and the insurer&rsquo;s agreement often takes several months. Starting early, and keeping records of every dietitian visit, medical treatment and weight-loss programme, makes the process smoother.<\/p>\n<h3>What does a typical follow-up schedule look like?<\/h3>\n<table>\n<thead>\n<tr>\n<th>When<\/th>\n<th>Typical content<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>First weeks<\/td>\n<td>Wound check, diet progression, hydration, adjustment of medicines<\/td>\n<\/tr>\n<tr>\n<td>Months 1 to 3<\/td>\n<td>Dietitian visits, first blood tests, review of supplements<\/td>\n<\/tr>\n<tr>\n<td>Months 6 and 12<\/td>\n<td>Weight, blood tests for deficiencies, reflux symptoms, mental health<\/td>\n<\/tr>\n<tr>\n<td>Month 18 to year 2<\/td>\n<td>Plateau assessment; discussion of body contouring if relevant<\/td>\n<\/tr>\n<tr>\n<td>Every year for life<\/td>\n<td>Blood tests, weight, reflux check, bone health, review of habits<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The exact schedule depends on your centre and your health. Missing follow-up appointments is one of the strongest predictors of deficiencies and of regain, so treat them as part of the treatment, not an optional extra.<\/p>\n<h3>What if my insurer refuses coverage?<\/h3>\n<p>Ask for the reason in writing. A refusal based on a formal criterion, for example insufficient documentation of previous weight-loss treatment, can sometimes be resolved by providing missing documents. Medespoir&rsquo;s guide notes that a refusal based on a formal criterion does not settle the medical question, and that an independent assessment remains possible.<\/p>\n<h2 id=\"abroad\">A sleeve in Tunisia: what changes<\/h2>\n<p>Medespoir organises sleeve gastrectomy in Tunisia for people living in Switzerland, as described on its <a href=\"https:\/\/www.medespoir.ch\/sleeve.php\">sleeve page<\/a> and in its <a href=\"https:\/\/www.medespoir.ch\/guide-chirurgie-obesite.php\">obesity surgery guide<\/a>. A sleeve in Tunisia is significantly cheaper than in Switzerland; the exact price is given in a free, personalised quote sent within 48 hours.<\/p>\n<p>The most important point to understand is coverage: Medespoir&rsquo;s guide states plainly that if you are operated on abroad, Swiss basic insurance coverage for the operation no longer applies. The guide recommends Switzerland when you meet the criteria, for coverage and follow-up close to home. Surgery abroad is mainly relevant for people who do not meet the Swiss criteria or choose to pay themselves. It also explains that in Tunisia the process is in French without an interpreter, the flight takes about two hours, a nutritional contact is organised before you leave, and you receive a report that can be used by your doctors in Switzerland.<\/p>\n<h3>What does the Tunisian package include?<\/h3>\n<p>The pre-operative consultation, tests, the operation with the full team, the operating theatre, hospitalisation, the operative report, the check-up and discharge authorisation, full-board hotel accommodation for you and one companion, all transfers and remote follow-up after your return to Switzerland. Flights, personal expenses, an extension for convenience, care received in Switzerland after your return, travel insurance (recommended) and bank charges are not included.<\/p>\n<h3>How do I organise follow-up at home?<\/h3>\n<p>Before leaving, identify a GP in Switzerland who agrees to follow you, knows about bariatric surgery or works with a dietitian, and will order your blood tests. Keep the operative report and the endoscopy results. Know which hospital you would go to in an emergency, and carry a note saying you have had a sleeve. Lifelong vitamins and annual checks are not optional, wherever you were operated on.<\/p>\n<h3>And Turkey?<\/h3>\n<p>Medespoir&rsquo;s clinics in Istanbul are confirmed for hair transplants. For bariatric surgery, the quote will specify whether the operation is possible in Turkey and where.<\/p>\n<p><strong>Your next step:<\/strong> request a <a href=\"https:\/\/www.medespoir.ch\/devis.php\">free, personalised quote<\/a> for a sleeve. A sleeve in Tunisia is significantly cheaper than in Switzerland; the exact price is given in the quote, sent within 48 hours and without commitment.<\/p>\n<h2 id=\"faq\">Frequently asked questions<\/h2>\n<h3>Is a sleeve reversible?<\/h3>\n<p>No. The removed part of the stomach cannot be put back. A sleeve can, however, be converted into another operation, most often a gastric bypass.<\/p>\n<h3>How long does a sleeve operation take?<\/h3>\n<p>About one to two hours under general anaesthesia, by keyhole surgery.<\/p>\n<h3>How long will I stay in hospital?<\/h3>\n<p>Usually a few days, depending on recovery and the team&rsquo;s protocol.<\/p>\n<h3>Can the sleeve stretch over time?<\/h3>\n<p>The sleeve can dilate somewhat over the years, and hunger can partly return. Eating slowly, stopping at the first sign of fullness and avoiding large volumes help limit this.<\/p>\n<h3>Will I be able to eat normally again?<\/h3>\n<p>You will eat normal foods in much smaller portions. Some foods, such as dry meat, bread or very fatty dishes, may be less well tolerated, especially in the first year.<\/p>\n<h3>Can I drink alcohol after a sleeve?<\/h3>\n<p>Alcohol is absorbed faster and its effect is stronger after bariatric surgery. Most teams advise avoiding it during the first months and being very cautious afterwards.<\/p>\n<h3>What if I have reflux before surgery?<\/h3>\n<p>Tell your team. Depending on the endoscopy, a bypass may be recommended instead, or a hiatal hernia may be repaired during the sleeve.<\/p>\n<h3>Is the sleeve safe?<\/h3>\n<p>It is a well-established operation with a low risk of serious complications in experienced centres, but it is major surgery. Your individual risk depends on your health and should be discussed with your team.<\/p>\n<h2 id=\"sources\">Sources<\/h2>\n<ul>\n<li>Kraljevi\u0107 M et al. Long-term outcomes of laparoscopic Roux-en-Y gastric bypass vs laparoscopic sleeve gastrectomy for obesity: the SM-BOSS randomized clinical trial. JAMA Surg, 2025: <a href=\"https:\/\/doi.org\/10.1001\/jamasurg.2024.7052\">doi.org\/10.1001\/jamasurg.2024.7052<\/a><\/li>\n<li>Salminen P et al. Effect of laparoscopic sleeve gastrectomy vs Roux-en-Y gastric bypass on weight loss, comorbidities and reflux at 10 years (SLEEVEPASS). JAMA Surg, 2022: <a href=\"https:\/\/doi.org\/10.1001\/jamasurg.2022.2229\">doi.org\/10.1001\/jamasurg.2022.2229<\/a><\/li>\n<li>IFSO Worldwide Survey 2020\u20132021: current trends for bariatric and metabolic procedures. Obes Surg, 2024: <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/38438667\/\">pubmed.ncbi.nlm.nih.gov\/38438667<\/a><\/li>\n<li>Federal Office of Public Health, admission of Wegovy to the list of specialities, 1 March 2024: <a href=\"https:\/\/www.bag.admin.ch\/dam\/de\/sd-web\/4UEBFvIzBFFM\/wegovy-neuaufnahme-01-03-2024.pdf\">bag.admin.ch<\/a><\/li>\n<li>SVDE and Alliance Adipositas Schweiz, position paper on Wegovy and Mounjaro, 31 January 2026: <a href=\"https:\/\/svde-asdd.ch\/wp-content\/uploads\/2026\/02\/2026_01_28_Positionspapier-Wegovy-Mounjaro.pdf\">svde-asdd.ch<\/a><\/li>\n<li>Swiss Society for the Study of Morbid Obesity and Metabolic Disorders (SMOB), guidelines: <a href=\"https:\/\/www.smob.ch\/guidelines-for-the-surgical-treatment-of-obesity\/\">smob.ch<\/a><\/li>\n<li>Medespoir: <a href=\"https:\/\/www.medespoir.ch\/sleeve.php\">sleeve<\/a>, <a href=\"https:\/\/www.medespoir.ch\/guide-chirurgie-obesite.php\">obesity surgery guide<\/a>, <a href=\"https:\/\/www.medespoir.ch\/bypass.php\">bypass<\/a><\/li>\n<\/ul>\n<p><em>This article does not replace medical advice. Decisions about weight-loss surgery should be made with a multidisciplinary obesity team.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How sleeve gastrectomy is performed and works, ten-year results from the Swiss SM-BOSS trial, reflux, complications, vitamins, weight-loss injections and coverage in Switzerland.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[285],"tags":[],"class_list":["post-12821","post","type-post","status-publish","format-standard","hentry","category-switzerland"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gastric Sleeve in Detail: Technique and Long-Term Results<\/title>\n<meta name=\"description\" content=\"Gastric sleeve in detail: technique, ten-year results from the Swiss SM-BOSS trial, reflux, 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