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Gastric bypass (Roux-en-Y) is a laparoscopic weight-loss operation that creates a small stomach pouch and reroutes part of the small intestine. This both limits how much you can eat and reduces how many calories you absorb, producing strong, lasting weight loss and a powerful effect on type 2 diabetes and severe acid reflux.
Gastric bypass (Roux-en-Y) is a laparoscopic weight-loss operation that creates a small stomach pouch and reroutes part of the small intestine. This both limits how much you can eat and reduces how many calories you absorb, producing strong, lasting weight loss and a powerful effect on type 2 diabetes and severe acid reflux.
Gastric bypass divides the stomach into a small upper pouch and connects it directly to the lower small intestine, bypassing most of the stomach and the first part of the bowel. It is both restrictive (you eat less) and malabsorptive (you absorb fewer calories), which is why it often delivers the strongest metabolic results among bariatric procedures.
The operation is carried out laparoscopically through a few small incisions:
Assessment & preparation — blood tests, endoscopy and an anaesthetic review confirm fitness for surgery.
Pouch creation — a small stomach pouch (about the size of an egg) is formed.
Rerouting — the small intestine is divided and reconnected to the pouch in a Y-shape, bypassing the rest of the stomach and upper bowel.
Recovery — most patients walk the same day and stay 2–4 nights for monitoring.
You may be a suitable candidate if you:
Have a BMI of 40 or above, or 35+ with an obesity-related condition
Have type 2 diabetes or severe acid reflux that may respond especially well to bypass
Have not achieved lasting results with diet, exercise or medication
Are committed to lifelong nutrition, supplements and follow-up
Are healthy enough for general anaesthesia (ages ~18–65)
Real patient outcomes from Marmara Health Center
Hospital stay; walking the same day; liquid diet
Light daily activity; clear/full liquids
Pureed then soft foods
Transition to solid foods; full adaptation
Exercise builds up; ongoing dietitian follow-up
Many patients lose a large share of their excess weight within the first 12–18 months and see major improvements in blood sugar and blood pressure when they follow the plan.
Gastric bypass is a well-established procedure with a low complication rate in experienced centres, but it is more complex than a sleeve. Possible risks include bleeding, infection, a leak at a join (anastomosis), blood clots, internal hernia, marginal ulcers and “dumping syndrome.” Because absorption is reduced, lifelong vitamin and mineral supplements (iron, B12, calcium, vitamin D) and annual blood checks are essential.
Ministry-authorised health tourism — operating under the Republic of Türkiye Ministry of Health Health Tourism Authorization Certificate and a member of Health Türkiye.
Experienced multidisciplinary team — strong academic background and a high volume of successful procedures.
Accredited partner hospital — treatment in a fully equipped, modern clinical setting.
All-inclusive care — free online consultation, VIP airport transfers, accommodation, interpreter support and follow-up.
The most common questions about this treatment
Both are effective. Gastric bypass often has a stronger effect on type 2 diabetes and severe reflux and can produce slightly more weight loss, but it is more complex with higher deficiency risk. The sleeve is simpler with no rerouting. Your surgeon recommends the best fit.
Many patients lose a large portion of their excess weight within 12–18 months, comparable to or slightly above a sleeve. Results vary by individual and depend on following the nutrition, activity and follow-up plan.
Gastric bypass is technically reversible in rare medical situations, but it is designed and considered a permanent procedure. The lasting change to the digestive route drives long-term weight loss and metabolic benefits.
Dumping syndrome is nausea, cramping or lightheadedness after sugary or very fatty foods, because they pass quickly into the intestine. It is manageable by adjusting your diet and usually improves over time.
International patients usually stay about 7 days, covering pre-operative tests, the operation, a 2–4 night hospital stay and a post-operative check before flying home.
Explore other bariatric surgery options
Gastric sleeve surgery (sleeve gastrectomy) is a laparoscopic weight-loss operation that removes about 75–80% of the stomach, leaving a slim, banana-shaped "sleeve." Because the part of the stomach that produces most of the hunger hormone (ghrelin) is removed, you feel full sooner and hungry less often — driving significant, lasting weight loss.
Learn More
A gastric balloon is a non-surgical weight-loss option in which a soft silicone balloon is placed in the stomach and filled with saline. It takes up space so you feel full sooner and eat less. It involves no incisions, is temporary, and is fully reversible — a useful first step or an option for lower BMI.
Learn More
Metabolic surgery uses bariatric procedures — most often gastric bypass or sleeve gastrectomy — specifically to treat type 2 diabetes. Beyond weight loss, these operations change gut hormones that improve blood sugar control, helping many patients reduce their medication and, in some cases, achieve remission.
Learn MoreFor detailed information about our aesthetic, hair, dental and bariatric treatments, please use the contact channels below. Initial consultations for international patients can be arranged remotely via video call or WhatsApp.
Marmara Health Center
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