Bariatric and metabolic surgery: compare your options

Bariatric surgery treats obesity; “metabolic” describes its effects on conditions such as diabetes. This section helps you compare operations and endoscopic treatments, understand their benefits and risks, and explore surgeons, clinics and Bookimed prices abroad. Use it to prepare for a clinical review, not to choose an operation from price or weight-loss figures alone.

Options at a glance

Sleeve gastrectomy removes stomach tissue to leave a smaller stomach. Gastric bypass makes a small stomach pouch and reroutes food through the intestine. An adjustable band sits around the upper stomach without rerouting digestion. ^[1][2][3]

Endoscopic treatments use a scope passed through the mouth: a gastric balloon temporarily occupies stomach space, while endoscopic sleeve gastroplasty (ESG) folds and stitches the stomach without removing it. Robotic assistance is an approach to performing surgery, not a separate weight-loss operation. Revision changes a previous operation to address weight response or complications.

“Total weight loss” means the share of starting body weight lost. The figures below describe study groups, not a personal prediction. The surgical sleeve, bypass and band results come from the same trial; other rows cover different patients and follow-up periods and cannot be ranked directly against them.

The surgical trial measured results at 3 years after random allocation, not uniformly after surgery. Pandemic disruption meant some participants had not received their operation or attended follow-up. Its averages help compare treatment choices but are not a timetable for your own weight loss. ^[230][231]

Who qualifies for surgery?

Body mass index (BMI) relates weight to height. The bariatric surgery guideline recommends surgery at BMI 35 or above, even without a diagnosed obesity-related condition. At BMI 30–34.9, surgery can be considered when nonsurgical treatment has not produced substantial, lasting weight loss or improvement in associated illness. These thresholds support assessment; they do not select a particular operation. ^[232]

The guideline adjusts thresholds for Asian populations and says surgery should be offered above BMI 27.5. Individual assessment still matters. ^[234]

Endoscopic treatment has different criteria. Its guideline suggests treatment plus lifestyle changes at BMI 30 or above, or BMI 27.0–29.9 with at least one obesity-related condition. A balloon or ESG is therefore not simply a smaller version of surgical sleeve or bypass. ^[235][236]

Preparation includes a nutritional assessment and support for dietary changes. The team also assesses disordered eating, severe uncontrolled mental illness and active substance abuse so these can be addressed before surgery. A revision needs an individual review of the previous operation, nutrition and psychological health, often with an internal camera examination and contrast imaging. ^[237][239]

Results and risks: weigh them together

Sleeve and bypass: weight loss comes with different trade-offs

Sleeve can provide lasting weight reduction, but reflux may develop or worsen despite losing weight. A review reported a BMI reduction of 11.0 at 10 years after sleeve; this is a change in BMI, not a percentage of starting weight. Reflux evidence comes largely from smaller studies with short and varied follow-up. Medical treatment is generally tried before surgery for reflux after sleeve, while severe reflux may prompt discussion of conversion to bypass.

Bypass can produce substantial weight loss, but its forms are not interchangeable. Roux-en-Y bypass uses separate paths for food and digestive juices before they rejoin. One-anastomosis gastric bypass, also called mini bypass, uses a loop connection. Both carry risks of leaks at surgical joins and vitamin or mineral deficiencies, with lifelong supplementation needed. Roux-en-Y can also cause later ulcers, internal hernias and abdominal pain. ^{[244][245][246]}

For mini bypass, a review found a weighted mean total weight loss of 31.1% at at least 10 years, alongside an average conversion or revision rate of 5.2%. That evidence came from 5 retrospective studies containing 1,750 patients, with different numbers contributing to each result. A separate review with follow-up of at least 5 years reported bile reflux in 4%, ulcers at the join in 2% and malnutrition in 1%; the authors warned that malnutrition could be underestimated. These rates are not lifetime probabilities and should not be added together. ^[247][248]

Diabetes may improve after surgery, but improvement is not a promise of a permanent cure. In a review of 22 randomized trials involving 1,500 patients with obesity and type 2 diabetes, bypass had better remission results than sleeve at 1 and 3 years. The difference at 5 years was not statistically significant. Remission means diabetes is no longer meeting the study’s diagnostic criteria; definitions and durability matter when discussing results. ^[250]

Banding: adjustable, but follow-up and repeat procedures matter

The band can be adjusted without another operation, but it requires repeated visits and can slip, erode into the stomach or develop device problems. In the comparative trial, its lower average weight loss came with a 14% rate of correction, removal or conversion among 363 recipients through 3 years after allocation. Removing or changing the band is a further procedure, not a routine adjustment. ^{[251][252][254]}

Balloon and ESG: no stomach removal does not mean no risk

A balloon offers temporary help with weight loss, but benefit can diminish after removal. Pooled trials reported 10.7% total weight loss at removal after 6–8 months and 7.9% at 12 months; different sets of studies contributed to those time points. Pain, nausea and vomiting can lead to early removal. Reporting trials also included stomach ulcer or bleeding in 5 of 650 patients and a hole in the digestive tract in 2 of 653, with varying follow-up. ^{[256][257][258]}

ESG stitches rather than removes stomach tissue. A pooled review reported 17.88% total weight loss at 1 year, mainly from observational evidence. A separate safety review reported 194 serious events across 15,398 procedures, with a pooled rate of 1.25%; follow-up varied. Bleeding, perforation—a hole in the digestive tract—and blockage can occur. Continuing follow-up is associated with successful weight loss.

Robotic assistance and revision: ask what the operation is meant to achieve

Robotic assistance has not established a clear overall safety advantage over standard keyhole surgery. A prospective sleeve review found comparable complications and a small BMI advantage at 12 months, but rated all outcomes as very low-certainty evidence. Another bypass review, covering 82,155 patients, found more reoperations within 30 days with robotic assistance: 4.4% versus 3.4%. These are comparisons across studies, not results for a particular surgeon or clinic. ^[265][267]

Revision can address weight recurrence or problems such as severe reflux after sleeve, but another operation is not the only option. Medicines and endoscopic treatments may also be considered. For revisional SADI-S after band or sleeve, a review of 1,641 cases reported total weight loss of 22.11% at 60 months. It also reported leaks, diarrhoea and nutritional deficiencies across differing follow-up periods. These results cannot predict outcomes for every type of revision. ^{[268][269][270]}

Across bariatric surgery, a guideline reports a risk of death around the operation of 0.03%–0.2%. This is not a separate risk estimate for each method or for your health circumstances. Long-term care also matters: lifelong nutritional monitoring and procedure-specific vitamin and mineral supplementation help address deficiencies. Prolonged vomiting or difficulty swallowing needs investigation rather than being accepted as routine recovery. ^{[272][273][274]}

Read the method guides and supporting evidence for more detail on study populations, follow-up and limitations.

How to choose a surgeon and clinic

Start with the surgeon catalogue and clinic catalogue. Compare the proposed operation and the care around it, not just the headline package price. Useful questions for a clinical discussion include:

• Why does this operation fit my health, reflux symptoms and previous treatment? What alternatives should we discuss? ^[275][276]
• How will the team assess nutrition and readiness before treatment, and support dietary changes afterwards? ^[277]
• Who will arrange nutritional monitoring and supplements after I return home? For a band, where will adjustments take place? For a balloon, what is the removal plan? ^{[279][280][281]}
• How does the team assess and manage complications, and whom should I contact if symptoms develop? ^{[282][283][284]}

Featured profiles to explore include Burcin Batman at Hisar Hospital Intercontinental, Turkey, Samet Yardimci at Professor Dr. Samet Yardımcı Clinic, Turkey, and Ionut Hutopila at Ponderas Academic Hospital, Romania. Their listings provide starting points for comparing care; they do not establish a ranking or predict your outcome. ^{[285][286][287]}

For a focused search, open the method’s surgeon and clinic lists in the cost comparison below. A package count describes the available listings, not how experienced a team is or whether a particular patient can receive treatment there.

Cost on Bookimed by method

Recorded public package prices, according to the clinics. The median is the middle listed price, not a personal quote. Different procedures and inclusions are not directly comparable. Dates refer to the source collection, not a guarantee of price validity. Confirm the exact procedure, operator, hospital, exclusions and follow-up in a current itemised offer.

Package inclusions can differ substantially. For example, a Spanish sleeve listing specifies that the operation takes place at a hospital rather than the named clinic, with hotel accommodation excluded. The Spanish band package excludes transfers. These examples show why the operating site, accommodation, transfers and follow-up should be clear in the offer you review. ^[590][591]

No public revision package in this collection does not mean revision is medically unsuitable or unavailable. It means there is no listed package price here to compare; the proposed treatment requires an individual assessment. ^[593]

How a Bookimed request works

A Bookimed request starts a review; it is not an appointment. You can use the inquiry page ↗ to ask about a method or provider, including when you are still deciding between options.

Use the review to clarify the proposed operation, the named surgeon and operating hospital, the package inclusions and the follow-up plan. Clinical assessment may change the treatment plan and cost, so a displayed package should not be treated as confirmation that an operation is right for you. ^{[594][595][596]}

Request a bariatric treatment review ↗, or return to the programmes to compare specific offers. The next step is an informed discussion about suitability and care—not a commitment to surgery.

Request a treatment proposal

Gastric bypass ↗

Gastric band ↗

Gastric sleeve surgery (Sleeve gastrectomy) ↗

Gastric balloon ↗

Da Vinci Gastric Sleeve Surgery ↗

Da Vinci Gastric Bypass Surgery ↗

Roux-en-Y Gastric Bypass ↗

Endoscopic sleeve gastroplasty (ESG) ↗

Mini Gastric Bypass ↗

Robotic Sleeve Gastrectomy ↗

Robotic Roux-en-Y gastric bypass ↗

Robotic Assisted Mini Gastric Bypass ↗