Gastric sleeve surgery explained: how it works, 2022 eligibility guidelines, weight and diabetes results from SLEEVEPASS and SM-BOSS, reflux and other risks with rates, diet stages, vitamins, cost and insurance.
Fact-checked against FDA labels and official sources; not yet reviewed by a licensed clinician. This page is education, not medical advice. Talk to your doctor before starting, stopping or changing any treatment.
Key facts
- Type
- Medical
- Approach
- Surgical
- Sedation
- General anesthesia (NIDDK)
- Downtime
- 2+ weeks
- Permanence
- Permanent
- Performed by
- Bariatric surgery
Key takeaways
- A gastric sleeve removes about 80% of the stomach and cannot be reversed.[1]
- Average total weight loss was 25.2% at 1 year and 18.8% at 5 years in 29,693 U.S. sleeve patients.[6]
- Reflux worsened in 31.8% after sleeve versus 6.3% after bypass in the SM-BOSS trial.[9]
- Major adverse events within 30 days were 2.6% after sleeve versus 5.0% after bypass.[6]
- Lifelong vitamins are needed; B12 deficiency is reported in 4% to 20% two to five years after a sleeve.[13]
In short: A gastric sleeve (sleeve gastrectomy) is an operation that removes about 80% of the stomach, leaving a narrow, banana-shaped tube. It is the most common weight-loss operation in the U.S., making up 58.2% of procedures in 2023. On average, people lose about a quarter of their body weight in the first year and keep off most of it, though some weight often returns. It cannot be reversed, it can cause or worsen acid reflux, and it requires vitamins and follow-up for life.
This page explains how the sleeve works, who guidelines say may be considered, what the big trials found, the risks with their reported rates, recovery and eating afterwards, vitamins, cost and insurance, and how it compares with other options. It is education only: InstaTuck does not sell or arrange surgery. Research widely, talk with a licensed doctor and get a full evaluation at an accredited bariatric program before deciding anything.
Gastric sleeve at a glance
- About 80%of the stomach is removed; the rest is a banana-shaped tubeASMBS
- 157,254sleeve operations in the U.S. in 2023, 58.2% of all proceduresASMBS estimates
- 25.2%average total weight loss at 1 year; 18.8% at 5 yearsPCORnet, Annals of Internal Medicine 2018
- 2.6%major adverse events within 30 daysPCORnet, Annals of Internal Medicine 2018
Checked on October 6, 2026
What a gastric sleeve is
In a sleeve gastrectomy, the surgeon staples along the length of the stomach and removes the larger, outer part, about 80% of it. What remains is a tube about the size and shape of a banana. The intestines are not rerouted, which is the main difference from a gastric bypass. The NIH notes that the operation is mostly done laparoscopically, through several small cuts, under general anesthesia, and that it cannot be reversed because part of the stomach is removed.
The sleeve became the leading operation in little more than a decade. ASMBS estimates show 28,124 sleeves in 2011, when the bypass and the band were both more common, and 157,254 in 2023. ASMBS lists its advantages as a technically simpler operation with a shorter operating time, one that can be done in some higher-risk patients, with effective weight loss. Its listed disadvantages are that it is not reversible, may worsen reflux and heartburn, and has less effect on metabolism than the bypass operations.
| Item | Value |
|---|---|
| 2011 | 28,124 |
| 2013 | 75,359 |
| 2015 | 105,448 |
| 2017 | 135,401 |
| 2019 | 152,413 |
| 2021 | 152,866 |
| 2022 | 160,609 |
| 2023 | 157,254 |
Best estimates from available data. The 2020 dip (122,056) reflects the pandemic.
Source: ASMBS, Estimate of Bariatric Surgery Numbers, 2011-2023 (checked on October 6, 2026)
How it works
A smaller stomach fills sooner, so people feel full on much smaller portions. Removing the upper, outer part of the stomach also changes hormones made in the gut that influence hunger, fullness and blood sugar, which is one reason surgery is called metabolic surgery. Because the intestine is left in place, most nutrients are absorbed by the usual route, but eating far less food and making less stomach acid still lead to shortages of iron, vitamin B12, vitamin D and other nutrients over time.
Who may be considered
The 2022 ASMBS and IFSO guidelines recommend metabolic and bariatric surgery for adults with a BMI over 35, whether or not they have weight-related conditions, and say it should be considered for a BMI of 30 to 34.9 with metabolic disease such as type 2 diabetes. In Asian populations surgery should be offered from a BMI over 27.5. There is no evidence-based upper age limit, though frailty should be assessed, and appropriately selected adolescents can be considered at specialty centers. In the Teen-LABS study, adolescents who had a sleeve had lost 26% of their weight three years later.
Which operation suits a person depends on more than BMI. Surgeons consider reflux and hiatal hernia (the sleeve can make reflux worse), diabetes severity, other surgeries, medicines that must be absorbed reliably, and personal preferences. Medicare covers the laparoscopic sleeve at the discretion of local Medicare contractors for people with a BMI of 35 or more, an obesity-related condition and previous unsuccessful medical treatment. A team decides whether a sleeve fits a particular person; our BMI calculator is a starting point only.
What the studies show: weight
In the PCORnet Bariatric Study of 65,093 U.S. adults, people lost an average of 25.2% of their body weight one year after a sleeve and 18.8% after five years, compared with 31.2% and 25.5% after a bypass. Two randomized trials compared the two operations directly. In SLEEVEPASS (Finland, 240 patients), excess weight loss was 49% after the sleeve and 57% after the bypass at 5 years, and 43.5% and 50.7% at 10 years. In SM-BOSS (Switzerland, 217 patients), excess BMI loss at 5 years was 61.1% and 68.3%, a difference that was not statistically significant.
| Item | Sleeve | Bypass |
|---|---|---|
| 5 years | 49% | 57% |
| 10 years | 43.5% | 50.7% |
Mean at 5 years, median at 10 years. Excess weight is weight above a reference healthy weight.
Source: Salminen P et al., JAMA 2018 and JAMA Surgery 2022 (SLEEVEPASS) (checked on October 6, 2026)
What the studies show: diabetes and other conditions
In the STAMPEDE trial of adults with type 2 diabetes, 23% of those who had a sleeve reached an HbA1c of 6.0% or less at 5 years, compared with 29% after bypass and 5% with intensive medical therapy alone. In SLEEVEPASS at 5 years, type 2 diabetes remission was 37% after the sleeve and 45% after the bypass, and 29% versus 51% stopped their blood pressure medicines. At 10 years, high blood pressure remission was 8% after sleeve and 24% after bypass; diabetes, cholesterol and sleep apnea remission did not differ significantly.
Reflux: the sleeve’s best-known drawback
The sleeve turns the stomach into a narrow, higher-pressure tube, and reflux (heartburn, acid coming up) can start or get worse. In SM-BOSS, reflux got worse in 31.8% after a sleeve versus 6.3% after a bypass, and went away in 25.0% versus 60.4% of those who had it before. In SLEEVEPASS at 10 years, inflammation of the esophagus (esophagitis) was found in 31% after sleeve versus 7% after bypass, and Barrett’s esophagus, a change in the lining that needs monitoring, in 4% of both groups. Reflux is one of the common reasons people later have revision surgery to a bypass.
| Item | Sleeve | Bypass |
|---|---|---|
| Reflux worsened at 5 years (SM-BOSS) | 31.8% | 6.3% |
| Esophagitis at 10 years (SLEEVEPASS) | 31% | 7% |
| Barrett's esophagus at 10 years (SLEEVEPASS) | 4% | 4% |
Esophagitis and Barrett's figures from SLEEVEPASS (doi 10.1001/jamasurg.2022.2229).
Source: Peterli R et al., JAMA 2018 (SM-BOSS); Salminen P et al., JAMA Surgery 2022 (SLEEVEPASS) (checked on October 6, 2026)
Risks and complications
ASMBS puts the overall risk of death after bariatric surgery at about 0.1% and of major complications at about 4%, varying by procedure. For the sleeve, major adverse events within 30 days were 2.6% in the PCORnet study, lower than after bypass (5.0%). Early risks the NIH lists for weight-loss surgery include bleeding, infection, a leak along the staple line, blood clots that can travel to the lungs and, rarely, death. Later problems can include reflux, narrowing of the sleeve (stricture), gallstones after fast weight loss, nutrient shortages, hernias and changes in how alcohol affects you. In SLEEVEPASS, 15.7% of sleeve patients had a reoperation within 10 years; in SM-BOSS the figure at 5 years was 15.8%.
Alcohol deserves its own mention. The 2019 AACE, TOS and ASMBS guideline notes that after both sleeve and bypass, blood alcohol rises faster and peaks higher, and that breath tests can underestimate it; it advises high-risk groups to avoid alcohol because of the risk of alcohol use disorder. Smoking also raises the risk of complications, and the guideline says smokers should stop before surgery.
Preparing for a sleeve
The 2019 AACE, TOS and ASMBS guideline includes a pre-procedure checklist that most programs follow in some form. It covers a full history and physical exam focused on weight-related conditions; routine blood and urine tests; screening for nutrient shortages (iron, B12, folate and vitamin D); heart, lung and sleep apnea evaluation as needed; a digestive evaluation, which may include testing for H. pylori and an upper endoscopy when clinically indicated (useful to know about if you have reflux, which a sleeve can worsen); diabetes and thyroid checks; a nutrition evaluation by a registered dietitian; a psychosocial-behavioral evaluation; and counseling on smoking, pregnancy and finances, with informed consent. Some insurers add their own steps, such as a supervised diet period; the 2022 guidelines describe insurer-mandated pre-operative weight loss as scientifically unfounded, but the plan’s rules still decide coverage.
Use the waiting time well: practice eating slowly and stopping at the first sign of fullness, try protein shakes, build a walking habit and line up support at home for the first weeks. If you take a GLP-1 medicine such as Wegovy, tell the surgical team early; the labels warn about inhaling stomach contents during anesthesia because these medicines slow stomach emptying.
Recovery and eating after a sleeve
The 2019 guideline describes a staged diet that moves from clear liquids to regular textures over about six to eight weeks, guided by a registered dietitian, with three small meals a day, small bites chewed well, at least 60 grams of protein a day and no concentrated sweets. The American College of Surgeons’ general advice after an operation is that people usually take 1 to 3 weeks to return comfortably to normal activity and are discouraged from lifting more than 10 pounds or strenuous activity for at least 4 to 6 weeks; ask your surgeon about your own limits and when to return to work.
Typical diet stages after a sleeve (your program's plan comes first)
- Clear liquidsDays 1 to 2: sugar-free or low-sugar clear liquids.
- Full liquidsUp to about 10 to 14 days: low-sugar liquids including liquid protein.
- PureedFrom about 10 to 14 days: foods blended with enough fluid.
- SoftFrom about 2 weeks: chopped, ground or mashed foods that need little chewing.
- Regular texturesAbout 6 to 8 weeks after surgery, with protein first at meals.
Our guide to life after bariatric surgery covers each stage, protein, hydration, follow-up visits and the long term in detail, and the protein calculator and protein shakes guide help with the early weeks.
Vitamins and blood tests for life
The 2016 ASMBS nutrition guideline recommends that everyone take vitamin and mineral supplements after a sleeve, and the 2019 guideline’s checklist lists two multivitamin-with-mineral tablets a day as the minimum after a sleeve, plus calcium, vitamin D and vitamin B12 as needed. Your team sets your own plan from your blood tests. Deficiencies still happen: the guideline reports vitamin B12 deficiency in 4% to 20% of people two to five years after a sleeve, iron deficiency in under 18% and zinc deficiency in 19%.
Cost and insurance
ASMBS gives an average cost for bariatric surgery of $17,000 to $26,000 (checked on October 6, 2026); it does not give a separate national figure for the sleeve. A claims analysis presented at the ASMBS 2026 meeting found average total health care costs over two years of $41,400 after a sleeve for people with type 2 diabetes and a BMI of 35 or more, including care for complications, compared with $51,300 after a bypass. Ask any program for a written quote that lists the surgeon, anesthesia, hospital, tests, follow-up visits and what happens if a complication needs more care. Medicare covers the laparoscopic sleeve at the discretion of local contractors; private plans and Medicaid set their own rules. See our insurance hub and costs hub.
Alternatives and comparisons
The main surgical alternative is the gastric bypass, which gives somewhat more weight loss and helps reflux but has more early complications and nutrient shortages; our sleeve vs bypass comparison sets them side by side. The duodenal switch starts with a sleeve and adds an intestinal bypass for more weight loss and more nutritional risk. Less invasive options include endoscopic sleeve gastroplasty, which narrows the stomach with stitches through the mouth; in an analysis of 2023 U.S. registry data published in 2026, weight loss at 6 months was 18.5% after a surgical sleeve and 12.3% after ESG. Medicines such as Wegovy and Zepbound avoid an operation; see GLP-1 vs bariatric surgery. The bariatric surgery guide compares every operation.
Who explores it
The 2022 ASMBS/IFSO guidelines recommend metabolic and bariatric surgery for adults with a BMI over 35 and say it should be considered for a BMI of 30 to 34.9 with metabolic disease (thresholds lower in Asian populations; selected adolescents at specialty centers). The surgical team decides which operation fits a person.
How it works
About 80% of the stomach is stapled and removed, leaving a banana-shaped tube. A smaller stomach fills sooner, and the operation changes gut hormones that affect hunger, fullness and blood sugar. The intestines are not rerouted.
Typical results
Average total weight loss 25.2% at 1 year and 18.8% at 5 years (PCORnet, 29,693 sleeve patients). Excess weight loss 49% at 5 years and 43.5% (median) at 10 years in the SLEEVEPASS trial; excess BMI loss 61.1% at 5 years in SM-BOSS.
Ranges from published studies; individual results vary.
Recovery
Staged diet from clear liquids to regular textures over about 6 to 8 weeks (2019 AACE/TOS/ASMBS guideline). After an operation, the American College of Surgeons says people usually take 1 to 3 weeks to return comfortably to normal activity and avoid lifting over 10 pounds for at least 4 to 6 weeks. Lifelong vitamins and follow-up.
Risks
- Major adverse events within 30 days: 2.6% (PCORnet)
- Bleeding, infection, staple-line leak, blood clots and, rarely, death (NIDDK)
- New or worse reflux: worsened in 31.8% at 5 years in SM-BOSS; esophagitis 31% at 10 years in SLEEVEPASS
- Barrett's esophagus: 4% at 10 years in SLEEVEPASS
- Narrowing of the sleeve (stricture), hernias and gallstones after rapid weight loss
- Vitamin and mineral deficiencies: B12 4-20%, iron under 18%, zinc 19% (ASMBS 2016)
- Reoperation: 15.7% within 10 years (SLEEVEPASS)
- Faster, higher blood alcohol levels and risk of alcohol use disorder
Cost and insurance
| Price | Amount | Basis | Checked on |
|---|---|---|---|
| Typical total (national data) | 17,000-26,000 USD | average cost range for bariatric surgery overall (ASMBS; not sleeve-specific) | October 6, 2026 |
Prices change often and depend on pharmacy, plan and location. Insurance can change what you pay. Every price shows the date we checked it.
Medicare covers the laparoscopic sleeve at the discretion of local Medicare contractors for people with a BMI of 35 or more, at least one obesity-related condition and previous unsuccessful medical treatment for obesity. Private plans and Medicaid set their own criteria; ask for them in writing.
Insurance information checked on October 6, 2026.
Advantages and limitations
Advantages
- Technically simpler and shorter than bypass operations (ASMBS)
- Fewer major adverse events in the first 30 days than bypass (2.6% vs 5.0%, PCORnet)
- No intestinal rerouting, so fewer absorption problems than bypass or duodenal switch
- Can be converted to a bypass or duodenal switch later if needed
Limitations
- Cannot be reversed: most of the stomach is removed
- May cause or worsen reflux and esophagitis
- Somewhat less weight loss and metabolic effect than a bypass on average
- Lifelong vitamins and blood tests are needed
Choosing a provider
Check board certification, where the procedure is done (accredited facility), how many of these procedures the provider performs, and what follow-up care is included. Find a Bariatric Surgeon: credentials, accredited centers and what to ask
Alternatives
SurgicalGastric Bypass: how it works, results and long-term careSurgical · 2+ weeks
Medical deviceEndoscopicEndoscopic Sleeve Gastroplasty (ESG): what to knowEndoscopic
SurgicalDuodenal Switch (BPD/DS and SADI-S): results, nutrition and risksSurgical · 2+ weeks
FDA approved for weight managementPrescriptionInjectionWegovy (semaglutide): uses, side effects, cost and FDA statusSemaglutide: one ingredient, several brands · Injection · WeeklyComparisons
Related procedures
Research mentioning it
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Questions to Ask a Bariatric Surgeon (and How to Check Credentials)The questions to ask a bariatric surgeon and how to check credentials: American Board of Surgery…
10 Innovations That Changed Weight Loss (2016 to 2026)Ten weight-loss innovations from 2016 to 2026, listed by date: the new food label, Plenity, Imcivree,…Related guides
Bariatric Surgery: types, eligibility and life afterBariatric surgery explained: sleeve, bypass, duodenal switch and band compared, the 2022 eligibility guidelines, results, risks,…
Life After Bariatric Surgery: diet stages, vitamins, follow-up and the long termLife after bariatric surgery: guideline diet stages, protein, vitamins and minerals for life, follow-up visits and…
Find a Bariatric Surgeon: credentials, accredited centers and what to askHow to find a qualified bariatric surgeon: board certification, MBSAQIP accredited centers, the evaluation steps, risks,…Tools for this topic
Questions to ask a professional
- Do I have reflux or a hiatal hernia that makes a sleeve a poorer choice for me?
- Why a sleeve rather than a bypass for me, and could it be converted later?
- How many sleeves do you do a year, and what are your leak and readmission rates?
- What will my diet stages, protein goal and vitamin plan look like?
- How often will I have follow-up visits and blood tests, and for how many years?
Frequently asked questions
How much weight do you lose with a gastric sleeve?
In the PCORnet study, average total weight loss was 25.2% of starting weight at one year and 18.8% at five years. In the SLEEVEPASS trial, excess weight loss was 49% at five years. Results vary from person to person.
Can a gastric sleeve be reversed?
No. About 80% of the stomach is removed. A sleeve can be converted to another operation, such as a bypass, if problems such as severe reflux develop.
Does the gastric sleeve cause acid reflux?
It can. In the SM-BOSS trial, reflux worsened in 31.8% of sleeve patients at five years versus 6.3% after bypass. Tell your surgeon about any heartburn before surgery.
What BMI do you need for a gastric sleeve?
The 2022 ASMBS/IFSO guidelines recommend surgery from a BMI over 35 and say it should be considered from 30 with metabolic disease. Insurers may require a BMI of 35 or more with a weight-related condition.
How long is recovery after a gastric sleeve?
The diet moves from liquids to regular textures over about six to eight weeks. The American College of Surgeons says people usually return comfortably to normal activity in 1 to 3 weeks after an operation and avoid heavy lifting for 4 to 6 weeks; your surgeon sets your own plan.
Is the sleeve safer than the bypass?
In the PCORnet study, major adverse events within 30 days were 2.6% after sleeve and 5.0% after bypass. Over the long term, reoperation rates in the randomized trials were similar (15.7% vs 18.5% at 10 years in SLEEVEPASS).
Do you need vitamins after a gastric sleeve?
Yes, for life. Guidelines list a daily multivitamin with minerals plus calcium, vitamin D and B12 as needed, with regular blood tests, because deficiencies of B12, iron, zinc and vitamin D are reported after a sleeve.
Can you regain weight after a sleeve?
Some regain is common over the years. A team can check eating patterns, medicines and the anatomy; options include nutrition support, medicines and, for some people, revision surgery.
References
- Bariatric Surgery Procedures. American Society for Metabolic and Bariatric Surgery. (accessed October 6, 2026) Society statement
- Estimate of Bariatric Surgery Numbers, 2011-2023. American Society for Metabolic and Bariatric Surgery. (accessed October 7, 2026) Society statement
- Eisenberg D, Shikora SA, Aarts E, et al.. 2022 ASMBS and IFSO: Indications for Metabolic and Bariatric Surgery. Surgery for Obesity and Related Diseases, 2022. doi:10.1016/j.soard.2022.08.013 · PMID 36280539 (accessed October 6, 2026) Guideline
- Types of Weight-loss Surgery. National Institute of Diabetes and Digestive and Kidney Diseases (NIH). (accessed October 6, 2026) Government page
- Side Effects of Weight-loss Surgery. National Institute of Diabetes and Digestive and Kidney Diseases (NIH). (accessed October 6, 2026) Government page
- Arterburn D, et al.. Comparative Effectiveness and Safety of Bariatric Procedures for Weight Loss: A PCORnet Cohort Study. Annals of Internal Medicine, 2018. doi:10.7326/M17-2786 · PMID 30383139 · NCT02741674 (accessed October 6, 2026) Other
- Salminen P, et al.. Sleeve Gastrectomy vs Roux-en-Y Gastric Bypass on Weight Loss at 5 Years (SLEEVEPASS). JAMA, 2018. doi:10.1001/jama.2017.20313 · PMID 29340676 (accessed October 6, 2026) Randomized trial
- Salminen P, et al.. Sleeve Gastrectomy vs Roux-en-Y Gastric Bypass at 10 Years (SLEEVEPASS). JAMA Surgery, 2022. doi:10.1001/jamasurg.2022.2229 · PMID 35731535 · NCT00793143 (accessed October 6, 2026) Randomized trial
- Peterli R, et al.. Sleeve Gastrectomy vs Roux-en-Y Gastric Bypass on Weight Loss (SM-BOSS). JAMA, 2018. doi:10.1001/jama.2017.20897 · PMID 29340679 · NCT00356213 (accessed October 6, 2026) Randomized trial
- Schauer PR, et al.. Bariatric Surgery versus Intensive Medical Therapy for Diabetes: 5-Year Outcomes (STAMPEDE). New England Journal of Medicine, 2017. doi:10.1056/NEJMoa1600869 · PMID 28199805 · NCT00432809 (accessed October 6, 2026) Randomized trial
- Inge TH, et al.. Weight Loss and Health Status 3 Years after Bariatric Surgery in Adolescents (Teen-LABS). New England Journal of Medicine, 2016. doi:10.1056/NEJMoa1506699 · PMID 26544725 (accessed October 6, 2026) Other
- 2025 Fact Sheet: Metabolic and Bariatric Surgery (incl. SADI and OAGB counts). American Society for Metabolic and Bariatric Surgery, 2025. (accessed October 7, 2026) Society statement
- Parrott J, Frank L, Rabena R, et al.. ASMBS Integrated Health Nutritional Guidelines for the Surgical Weight Loss Patient 2016 Update: Micronutrients. Surgery for Obesity and Related Diseases; American Society for Metabolic and Bariatric Surgery, 2017. PMID 28392254 (accessed October 6, 2026) Guideline
- Mechanick JI, Apovian C, Brethauer S, et al.. Clinical Practice Guidelines for the Perioperative Nutrition, Metabolic, and Nonsurgical Support of Patients Undergoing Bariatric Procedures: 2019 Update (AACE/TOS/ASMBS/OMA/ASA). Endocrine Practice, 2019. doi:10.4158/GL-2019-0406 · PMID 31682518 (accessed October 6, 2026) Guideline
- Recovering from Surgery. American College of Surgeons. (accessed October 6, 2026) Society statement
- Sleeve Gastrectomy Shows Advantages over Endoscopic Sleeve Gastroplasty (ACS Brief, on Leslie ZD et al., J Am Coll Surg 2026). American College of Surgeons, 2026. (accessed October 7, 2026) News (reported facts only)
- Metabolic and Bariatric Surgery (fact page, incl. average cost). American Society for Metabolic and Bariatric Surgery. (accessed October 6, 2026) Society statement
- Study Finds Bariatric Surgery Less Costly Than GLP-1 Drugs Over Time (news release). American Society for Metabolic and Bariatric Surgery, 2026. (accessed October 6, 2026) News (reported facts only)
- National Coverage Determination 100.1: Bariatric Surgery. Centers for Medicare and Medicaid Services. (accessed October 7, 2026) Government page
- WEGOVY (semaglutide) injection and tablets: prescribing information. Novo Nordisk, via DailyMed, 2026. (accessed October 7, 2026) Drug label
Facts checked on October 6, 2026
Educational information, not medical advice. Talk with a qualified healthcare professional about your own situation. In an emergency call 911.