Gastric Bypass in Turkey: 2026 prices, how it differs from a sleeve, and life afterwards

The operation is done through four or five keyhole incisions under general anaesthetic and takes two to three hours. The new pouch holds about 30 ml, roughly the size of an egg. The small intestine is divided and the lower end is brought up and joined to the pouch; the upper end, carrying stomach acid and digestive enzymes, is reconnected further down. The result is a Y shape, which is where the name comes from.

Three mechanisms drive the weight loss, and this is why the bypass remains the benchmark operation. The pouch restricts how much you can eat. Bypassing the first part of the intestine reduces how many calories you absorb. And rerouting food past the duodenum changes gut hormone signalling in a way that affects appetite and blood sugar directly — which is why type 2 diabetes often improves within days, long before meaningful weight is lost.

Bypass or sleeve?

The short version: a bypass gives slightly more weight loss, is better for severe reflux and stronger for diabetes, but demands more rigorous lifelong supplementation and carries a slightly higher complication rate. A sleeve is simpler and gentler on nutrition. Our detailed guide to gastric sleeve versus gastric bypass sets out the trade-offs case by case.

What it does for health, not just weight

• Type 2 diabetes: remission rates are the highest of any bariatric procedure, and improvement often begins within days.
• Acid reflux: usually improves markedly, because acid no longer reaches the pouch. This is the main reason a bypass is chosen over a sleeve.
• High blood pressure and cholesterol: improve or resolve in a majority of patients.
• Sleep apnoea: frequently resolves as weight comes off.
• Fatty liver disease: typically improves substantially.

The three bariatric operations compared

What the package includes

• Bariatric surgeon and anaesthetist fees
• Three nights in a JCI-accredited private hospital
• All pre-operative blood tests, endoscopy and scans
• Leak test performed during the operation
• Four nights in a four-star hotel with breakfast
• All airport, hotel and hospital transfers
• A personal English-speaking coordinator
• Dietitian consultations before and after surgery
• Twelve months of structured dietitian follow-up
• Vitamin and supplement starter pack

What is not included

Flights are excluded so you can choose your own route and fare. Also excluded: travel insurance that covers bariatric surgery abroad, meals beyond hotel breakfast, your ongoing vitamin supply after the starter pack, and treatment for any pre-existing condition found during your work-up. There are no consultation fees at any stage.

What it costs elsewhere

Turkey has become one of the world's leading medical travel destinations. According to Turkish industry figures reported in July 2026, the country welcomed around 1.4 million health tourists in 2025, generating over $3 billion in revenue. Weight-loss surgery is one of the fastest-growing categories.

• Value: lower operating and living costs mean you pay less for the same type of surgery and hospital care.
• Experience: leading bariatric surgeons in Istanbul operate every week.
• Speed: consultations can be arranged online within days, and surgery dates are flexible.
• Access: most UK and European airports have direct flights of around 3–4 hours.
• Recovery comfort: you recover in a hotel with a coordinator on hand, rather than managing alone at home.

Every Velsa quote names the bariatric surgeon and the hospital before you pay, so you can check both yourself.

A gastric bypass is usually suitable if

• Your BMI is 40 or more, or 35 or more with an obesity-related health condition.
• You have severe acid reflux or a hiatus hernia — a bypass usually improves both, where a sleeve can worsen them.
• You have type 2 diabetes, where bypass gives the highest remission rates.
• You have tried to lose weight through diet, exercise or medication without lasting success.
• You are prepared to take supplements and have blood tests for life.
• You previously had a sleeve or band that did not work, or caused reflux.

You may need to wait, or consider something else

• You cannot commit to lifelong supplementation — a sleeve affects absorption far less.
• You take regular anti-inflammatory medication, which substantially raises the risk of pouch ulcers after a bypass.
• You have a condition needing frequent endoscopy of the stomach or bile duct, which becomes much harder after rerouting.
• You have an untreated eating disorder, or an unmanaged mental health condition.
• You have an active alcohol dependency — alcohol is absorbed far faster after a bypass, and the risk of developing a problem rises.
• You are pregnant, or planning a pregnancy within the next 18 months.

Our BMI and eligibility calculator shows where you sit against the standard criteria in about a minute, and a bariatric surgeon reviews your details free of charge before you commit to anything.

1. 1Before you travel: you complete a medical questionnaire and send recent blood results. A bariatric surgeon and a dietitian review them and confirm whether a bypass or a sleeve suits you better. You receive a written fixed quote and start the two-week liver-shrinking diet at home.
2. 2Day 1 — arrival: your driver meets you at Istanbul airport and takes you to the hotel. Rest after the flight.
3. 3Day 2 — assessment: blood tests, ECG, chest X-ray, abdominal ultrasound and an endoscopy, then consultations with your surgeon, the anaesthetist and the dietitian. You are admitted in the evening.
4. 4Day 3 — surgery: the operation takes two to three hours. You wake in your room and will be asked to stand and walk the same evening, which is what prevents blood clots.
5. 5Day 4 — leak test and first liquids: a swallow test confirms both joins are sealed, after which you begin sips of water and clear liquids.
6. 6Day 5 — discharge: you move to the hotel, walking regularly, with your coordinator checking in daily.
7. 7Days 6 and 7 — recovery in the hotel: light activity only. Your coordinator is on WhatsApp at any hour and the hospital is fifteen minutes away.
8. 8Day 8 — final check and fly home: bloods repeated, your surgeon confirms you are fit to fly, and you leave with your discharge summary, medication, supplements and a written diet plan.
9. 9After you are home: dietitian appointments at 2 weeks, 1, 3, 6 and 12 months, with your surgeon available throughout.

1. 1Anaesthetic: a consultant anaesthetist puts you to sleep. A breathing tube is placed and you are monitored throughout.
2. 2Access: four or five incisions of 5–12 mm are made across the upper abdomen, and carbon dioxide is used to create working space.
3. 3Creating the pouch: the surgeon staples across the top of the stomach to form a pouch of about 30 ml, completely separated from the rest of the stomach. The remnant stomach stays in place and continues to produce digestive juices.
4. 4Dividing the small intestine: the jejunum is divided roughly 50 cm beyond the stomach.
5. 5The first join (gastrojejunostomy): the lower end of the divided intestine is brought up and joined to the pouch. This is the connection food passes through, and the one that must be sized precisely.
6. 6The second join (jejunojejunostomy): the upper end, carrying bile and pancreatic enzymes, is reconnected 100–150 cm further down, forming the Y.
7. 7Closing gaps and testing: the mesenteric defects are closed to reduce the risk of an internal hernia later. A leak test with dye or air confirms both joins are sealed.
8. 8Closing: the incisions are closed with dissolving sutures. A drain is sometimes left for 24–48 hours.

The physical recovery

• Days 1–3: discomfort at the incision sites and shoulder-tip pain from the gas, which passes. You walk from the first evening.
• Week 1: tiredness dominates. Clear liquids only, sipped constantly to stay hydrated.
• Weeks 2–4: energy returns gradually. Most patients are back at a desk job by week three or four. No lifting over 5 kg.
• Weeks 4–6: light exercise such as walking and swimming once the wounds are fully healed.
• Week 6 onwards: full activity, including the gym, with your surgeon's approval.

The diet stages

• Stage 1 — clear liquids, weeks 1–2: water, broth, diluted juice. Hydration is the only goal.
• Stage 2 — full liquids and purée, weeks 2–4: soups, yoghurt, protein shakes. Protein becomes the priority and stays there.
• Stage 3 — soft food, weeks 4–6: scrambled egg, flaked fish, soft vegetables, chewed far more than feels necessary.
• Stage 4 — normal texture, week 6 onwards: regular food in portions of roughly 100–150 ml. Protein first at every meal, for life.

Velsa works only with JCI-accredited private hospitals in Istanbul that run a dedicated bariatric programme with intensive care on site, and with surgeons registered with the Turkish Ministry of Health who perform this operation routinely. You are given your surgeon's name and registration number before you pay anything.

Risks you should know about

• Anastomotic leak: a leak at either join, affecting around 1–2%, usually appearing in the first week and sometimes needing further surgery.
• Marginal ulcer: ulceration at the pouch join, strongly linked to smoking and anti-inflammatory drugs.
• Internal hernia: bowel slipping through a gap in the mesentery, which can occur years later and is a surgical emergency. Persistent cramping pain after a bypass always needs investigating.
• Stricture: narrowing at the join causing vomiting, usually treated endoscopically.
• Dumping syndrome: common, and for many patients a useful deterrent rather than a complication.
• Nutritional deficiency: B12, iron, calcium, vitamin D, folate and thiamine. Lifelong supplements and annual blood tests are mandatory.
• Blood clots: the reason for injections, stockings and early walking.
• Alcohol sensitivity: alcohol is absorbed much faster and hits harder; the risk of developing a dependency rises after a bypass.

Tell your GP before you travel. A discharge summary in English and a GP who knows what was done makes aftercare at home far easier, and Velsa provides the paperwork as standard.

Your surgeon will only add a second procedure where there is a clinical reason, because longer operating times in bariatric surgery raise the risk of clots and wound problems in patients already at higher risk.

Sometimes done at the same time

• Hiatus hernia repair: commonly done, and particularly relevant since reflux is often the reason a bypass was chosen.
• Gallbladder removal: if you already have symptomatic gallstones. Rapid weight loss makes stones more likely, but many surgeons prefer to wait and see.

Planned for later, usually 12–18 months on

• Tummy tuck: the most common follow-up, once your weight has been stable for at least six months.
• Body lift after weight loss: for loose skin across the abdomen, back and thighs.
• Arm lift and thigh lift: frequently wanted after large weight loss.
• Breast lift: breast volume and position change substantially after significant loss.

Do not book body contouring alongside your bypass. Operating before your weight has stabilised produces a result that will not hold, and combining two major operations is not safe.

• Liver-shrinking diet: two weeks of a low-carbohydrate, high-protein diet before surgery. A smaller liver makes keyhole access safer, and surgeons do cancel operations when this has been skipped.
• Medication: tell your surgeon everything you take. Anti-inflammatories must stop permanently, and diabetes medication and insulin doses usually change rapidly after surgery.
• Smoking: stop at least four weeks before, permanently if you can. Smoking is the strongest risk factor for a marginal ulcer at the join.
• Time off: plan 3–4 weeks away from work, and 6 weeks away from heavy lifting and strenuous exercise.
• Your GP: tell them before you go, and arrange follow-up blood tests at 3, 6 and 12 months and annually thereafter.
• Packing list: loose clothing with no waistband pressure, slip-on shoes, compression stockings, a refillable water bottle and your medication in its original packaging.

A realistic picture: someone starting at 135 kg with an ideal weight around 70 kg has 65 kg of excess weight, and would typically expect to lose 42–52 kg. Most of that happens in the first six to nine months. A regain of 5–10% between years two and five is common and is the normal shape of the curve rather than a failure.

The patients who hold the result are the ones who kept attending follow-up and never stopped the supplements. Protein at every meal, separating drinking from eating, lifelong vitamins and annual bloods are what sustain it. Velsa includes twelve months of structured dietitian support for exactly this reason, and our weight-loss before and after gallery shows outcomes at 12 and 24 months as consented cases are added.