Op. Dr. Mehmet Mehdi Deniz
Bariatric and metabolic surgeon based in Istanbul at Medipol Bahçelievler University Hospital. Op. Dr. Mehmet Mehdi Deniz earned his medical degree at İstanbul University's İstanbul Faculty of Medicine and completed his General Surgery specialist training at İstanbul Training & Research Hospital. With experience across thousands of successful operations, he focuses on obesity and metabolic surgery — sleeve gastrectomy, gastric bypass, gastric balloon and diabetes (metabolic) surgery — using laparoscopic, minimally invasive techniques and a patient-centred, long-term approach to weight loss.
Credentials & Qualifications
Education, specialist training and professional background
- General Surgery Specialist Training, İstanbul Training & Research Hospital, 2014
- MD, İstanbul University, İstanbul Faculty of Medicine, 2008
- General Surgery Specialist — Turkish Ministry of Health
- Bariatric & Metabolic Surgery, Medipol Bahçelievler University Hospital
- Author of 12+ peer-reviewed medical publications in general and gastrointestinal surgery
- International obesity programme, Medipol Bahçelievler University Hospital — patients from the Gulf, Europe and the Pacific
About Op. Dr. Mehmet Mehdi Deniz
Bariatric and metabolic surgeon in Istanbul
Op. Dr. Mehmet Mehdi Deniz is a General Surgery specialist who has devoted his career to bariatric and metabolic surgery — the surgical treatment of obesity and type-2 diabetes. He completed his medical education at İstanbul University's İstanbul Faculty of Medicine and his specialist training in General Surgery at İstanbul Training & Research Hospital, one of Turkey's busiest surgical centres.
Over a career spanning practice since 2009 and specialist surgery since 2014, he has built experience across thousands of successful operations at leading Istanbul hospitals, including Şişli Kolan International Hospital and, today, Medipol Bahçelievler University Hospital — where he leads an international obesity programme caring for patients from around the world.
His surgical focus covers the full range of modern weight-loss procedures — sleeve gastrectomy (gastric sleeve), gastric bypass, gastric balloon, transit bipartition and SASI (loop bipartition) — alongside metabolic surgery for type-2 diabetes and laparoscopic general procedures such as hernia repair and single-incision (SILS) gallbladder removal. He performs these using minimally invasive, laparoscopic techniques that reduce scarring, pain and recovery time.
For Op. Dr. Deniz, obesity surgery is a long-term partnership rather than a single operation: careful patient selection, the right procedure for each individual, and structured follow-up with dietitian support are what turn surgery into lasting results.
Obesity surgery is not the end of a journey but the beginning of a new life — success is measured in the years after the operation, not the day of it.
Surgical Specialties
Areas of focus and signature procedures
Sleeve Gastrectomy (Gastric Sleeve)
Laparoscopic reduction of the stomach to a slim tube, lowering both food capacity and hunger hormones — the most widely performed weight-loss procedure worldwide.
Gastric Bypass
A combined restrictive and metabolic procedure that is especially effective for higher BMI and for patients with type-2 diabetes or severe reflux.
Metabolic & Revision Surgery
Transit bipartition, SASI (loop bipartition) and gastric balloon options, plus metabolic surgery targeting type-2 diabetes control, tailored to each patient's health profile.
Robotic & Laparoscopic General Surgery
Da Vinci robotic and laparoscopic techniques for hernia repair, single-incision (SILS) gallbladder removal, and thyroid, breast and colorectal conditions — precise, minimally invasive care beyond weight loss.
Patient Reviews
“From the first consultation to my recovery, Dr. Mehdi and the Livist Medical team explained everything clearly and looked after me at every step. I could not be happier with my results.”
United Arab Emirates
Frequently Asked Questions
Common questions about Op. Dr. Mehmet Mehdi Deniz
He specialises in bariatric and metabolic surgery, including sleeve gastrectomy (gastric sleeve), gastric bypass, gastric balloon, transit bipartition and SASI, as well as metabolic surgery for type-2 diabetes and laparoscopic general surgery.
He earned his medical degree at İstanbul University's İstanbul Faculty of Medicine and completed his General Surgery specialist training at İstanbul Training & Research Hospital.
He is based at Medipol Bahçelievler University Hospital in Istanbul, where he leads an international obesity programme for patients travelling from abroad.
Turkish (native) and English, supporting clear communication with international patients — with full interpreter support provided by Livist Medical.
Ready to consult Op. Dr. Mehmet Mehdi Deniz?
Book your free consultation and take the first step with Op. Dr. Mehmet Mehdi Deniz, a specialist in Bariatric Surgery.