Mini Gastric Bypass (One Anastomosis Bypass)
A shorter absorption-altering operation using a single intestinal connection.
Save up to 70% vs the UK & Germany
- Stay in Istanbul
- 6-7 days
- Time in theatre
- 90 min
- In hospital
- 3 nights
- Anaesthesia
- General anaesthetic
- Back to work
- 16 days
- Full result
- 18 months
Overview
A mini gastric bypass creates a long, narrow stomach pouch and joins it to the small intestine with a single connection, laparoscopically. Where a classic Roux-en-Y bypass uses two joins, this uses one, which shortens the operation. Because it alters absorption, it requires lifelong vitamin supplementation and blood monitoring. In Istanbul it takes around 90 minutes under general anaesthetic, with three nights in hospital.
Benefits
- A single anastomosis keeps theatre time to around 90 minutes
- Reduces portion size and calorie absorption together
- A marked metabolic effect on type 2 diabetes
- Patients lose on average 60–75% of excess weight over 12–18 months
- Performed laparoscopically; desk work is usually resumed in about 16 days
Who is this treatment for?
Usually suitable
- A BMI of 40 or above, or 35–40 with a metabolic condition
- Long-standing type 2 diabetes that may benefit from an absorption-altering operation
- Readiness to take lifelong supplements and attend regular blood monitoring
Needs assessment first
- Significant reflux or damage to the lining of the oesophagus
- Anyone planning a pregnancy within the next 12–18 months
- Difficulty sustaining supplements and check-ups, untreated eating disorders or alcohol dependence
Final suitability is decided by your consultant after examination and imaging in Istanbul.
Your treatment, step by step
- 01
Free online consultation
Send your BMI, metabolic conditions and any reflux symptoms. Within 24 hours we tell you which technique looks appropriate and why.
- 02
Assessment day in Istanbul
Endoscopy, blood tests, a chest X-ray and any required consultations are completed on day one. If endoscopy shows significant reflux, a different operation may be recommended.
- 03
Laparoscopic surgery
Under general anaesthetic, the pouch is created and a single connection is made to the small intestine in about 90 minutes. A leak test is carried out during surgery.
- 04
Discharge and check-up
You are monitored for three nights, then recover at your hotel. After a check-up and dietitian appointment you fly home at the end of the 6–7 days, with your surgeon's approval.
Aftercare & long-term tips
You move from clear fluids to purée, then soft food, reaching solids at around six weeks, with a daily protein target set by your dietitian. Supplements continue for life and your blood results are checked at set intervals. Report heartburn or a bitter taste in the mouth without delay, since these can signal bile reflux; dietitian follow-up runs for twelve months.
First 24 hours
Stick to soft, lukewarm foods and drinks; avoid very hot or hard items while any numbness or sensitivity settles.
First few days
Ease back into normal eating as sensitivity fades — usually within a few days.
Long term
Eat normally and protect your result with the simple habits below.
Do
- Brush twice a day and floss daily
- Attend your regular check-ups and cleanings
- Wear a night guard if you grind your teeth
- Keep the area clean and rinse as advised
Avoid
- Biting very hard objects — ice, pen lids, shells
- Opening bottle or soda caps with your teeth
- Too many hard nuts or sticky, chewy sweets
- Smoking and staining drinks in the first days
What's included
- Free consultation & treatment plan
- Treatment by specialist dentists
- 5-star hotel accommodation
- Private VIP airport transfers
- Personal translator & 24/7 support
- Aftercare & treatment guarantee
Risks and an honest expectation
A mini gastric bypass carries risks of leak at the join, bleeding, stricture, clots in the leg or lung vessels, bile reflux, marginal ulcer, permanent vitamin and mineral deficiency and, rarely, a further operation. A leak test is performed during surgery, clot prevention and compression stockings are used, and you are mobilised early. Surgery takes place in a fully equipped hospital with intensive care, and your supplement and blood monitoring plan is given to you in writing at discharge.
They flew in. They flew home changed.
Frequently asked questions
Other treatments in this department
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