The gastric sleeve (sleeve gastrectomy) is the most commonly performed weight-loss operation in the world, and the one most patients we work with ultimately choose. The surgeon removes about 80% of the stomach, leaving a narrow, banana-shaped tube. The result is twofold: you feel full on much smaller portions, and — because the removed part of the stomach produces most of the hunger hormone ghrelin — your appetite drops as well. The surgery we arrange in Istanbul is planned honestly around whether it is the right operation for you.
At the accredited partner hospitals we work with, sleeve gastrectomy is performed by board-certified bariatric surgeons by keyhole (laparoscopic) surgery, in fully equipped operating theatres with full anaesthetic cover — the standard that matters for a major abdominal operation.
How the gastric sleeve works
The sleeve works in two ways at once:
- Restriction. With around 80% of the stomach removed, the remaining tube holds far less, so you are satisfied by small meals.
- Reduced hunger. The part removed includes the fundus, which produces most of your ghrelin. Less ghrelin means less of the constant hunger that makes dieting so hard.
Unlike the gastric bypass, the sleeve does not re-route the intestine, so it causes less malabsorption and slightly fewer long-term nutritional problems — though, as below, lifelong supplements are still essential. And unlike the gastric balloon, it is permanent: there is no removing it later.
Are you a candidate?
The sleeve is usually considered when:
- Your BMI is 40 or more, or
- Your BMI is 35 or more with a weight-related condition such as type-2 diabetes, high blood pressure, sleep apnoea or fatty-liver disease.
Newer guidance from bodies such as the ASMBS and IFSO lowers these thresholds for some patients, particularly where type-2 diabetes is present. Just as important is what makes the sleeve less suitable: significant existing acid reflux often points toward a bypass instead, because the sleeve can make reflux worse.
Your candidacy is confirmed by the partner team after a full assessment — medical history, blood tests, and a frank conversation about whether you are ready for the lifelong changes. We will tell you honestly if the sleeve is not the right answer for you.
Gastric sleeve vs bypass vs balloon
The three procedures are not interchangeable. This is the short version of how they compare; each page goes deeper.
| Gastric sleeve | Gastric bypass | Gastric balloon | |
|---|---|---|---|
| Surgery? | Keyhole surgery, permanent | Keyhole surgery, permanent | No surgery — endoscopic, temporary |
| How it works | Removes ~80% of stomach | Small pouch + re-routed intestine | Balloon fills part of the stomach |
| Best for | BMI 35+, most patients | Higher BMI, reflux, type-2 diabetes | Lower BMI, or a first step |
| Reflux | Can worsen reflux | Usually improves reflux | Neutral |
| Reversible | No | Technically yes | Yes — removed at ~6 months |
| Indicative from | €3,000 | €3,800 | €1,800 |
If your main issue is reflux or poorly controlled diabetes, the surgeon may steer you toward the bypass. If you are not ready for permanent surgery, the balloon is the gentler starting point. The right answer is the one that fits your body and your goals — not the most expensive option on the list.
The procedure, step by step
- Assessment and planning. Medical history, blood tests and any needed scans are reviewed, the sleeve confirmed as suitable, and a written plan agreed.
- Anaesthesia. General anaesthesia in an accredited hospital with full anaesthetic cover.
- Surgery. Through a few small keyhole incisions, the surgeon removes about 80% of the stomach and seals the new sleeve with a surgical stapler. The operation takes around an hour.
- Leak test and recovery. The staple line is checked, and you are monitored closely in hospital before moving to your hotel.
Recovery timeline
- Days 1–3 (in hospital): Rest, pain relief, gentle walking to prevent blood clots, and sips of fluid once the team is satisfied. A leak test confirms the sleeve is sealed.
- Days 4–6 (at your hotel): You stay on fluids, the team monitors you, and the surgeon reviews you before you fly. Most people fly home around day 5–6.
- Weeks 1–4: A staged diet — fluids, then puréed food, then soft food — set out by the dietitian. Most desk-based work resumes around 2 weeks.
- Weeks 4–8: Gradual return to normal-texture food in small portions; light activity builds back up.
- Months 3–18: The bulk of weight loss happens over this period as your new eating pattern settles in.
We plan a 5–6 night stay in Istanbul so the surgeon can confirm you are recovering safely before you travel.
The lifelong commitment
The sleeve is a powerful tool, but it is not a cure on its own — and an honest clinic says so before you book. Lasting results depend on:
- Eating differently for good — small, protein-first meals, slowly, guided by the dietitian.
- Lifelong vitamins — a daily multivitamin plus B12, vitamin D, iron and calcium as advised. Your smaller stomach absorbs less, so skipping them risks real deficiencies over the years.
- Follow-up blood tests, which we coordinate after you return home.
- Realistic expectations — weight comes off over 12–18 months, and some regain is normal.
If you are not ready for that, the operation will not deliver what you hope. We would rather have that conversation now than after surgery.
Risks and complications
Sleeve gastrectomy is major surgery and carries real, if uncommon, risks — managed by operating in an accredited hospital with proper anaesthetic and post-operative care:
- Staple-line leak — the most serious early complication, which is why a leak test and close monitoring matter and why we do not rush your discharge.
- Bleeding and, rarely, blood clots — prevented with early walking and blood-thinning measures.
- Acid reflux (GERD), which the sleeve can cause or worsen.
- Nutritional deficiencies over time if supplements are skipped.
- Narrowing (stricture) of the sleeve, occasionally needing treatment.
A board-certified surgeon in an accredited facility, with a full workup and structured aftercare, is the single biggest safety factor. The NHS guide to weight-loss surgery sets out the risks independently and is worth reading before your consultation.
Cost of a gastric sleeve in Turkey
Sleeve gastrectomy in Istanbul starts at an indicative €3,000, typically all-inclusive of surgery, hospital stay, hotel and transfers. That is well below UK or US pricing for comparable surgery and accreditation, because Turkish operating costs are lower — not because standards are. As with all surgery here, the figure is a starting range rather than a fixed quote; your firm price follows the team’s review of your case and confirmation that you are a candidate. For an all-inclusive price comparison across all three procedures, see the weight-loss surgery cost guide.
Why Alpha Clinic
Alpha Clinic Turkey has coordinated medical care in Istanbul since 2012, matching patients to board-certified partner surgeons in accredited hospitals, with a written plan you approve and aftercare we coordinate once you are home. Send your details and a short health history through the free consultation for an honest assessment, compare the gastric bypass and the non-surgical gastric balloon, or see all three on the weight-loss surgery hub.
New to weight-loss surgery? Read our honest guides on gastric sleeve vs gastric bypass, life after a gastric sleeve and whether weight-loss surgery in Turkey is safe.