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Gastric Bypass

Gastric Bypass

The small intestine brought from below is connected to the upper small gastric chamber. With the “Gastric Bypass”, it is aimed to both eat less and decrease the absorption of what they eat. Gastric bypass, which is the most frequently applied method in the USA, tends to decrease proportionally due to the fact that sleeve gastrectomy surgeries are more preferred. Experience shows that the biggest disadvantage of this method is that it is technically very difficult to switch to a second method in case of weight gain after gastric bypass.

Although the need for a second surgery after gastric bypass is less than the sleeve gastrectomy method, the transition to Duodenal Switch, which is the most successful method in terms of both diabetes control and effective and permanent weight loss, is much easier after sleeve gastrectomy.


He completed his medical education at Istanbul University Cerrahpaşa Faculty of Medicine between 1986-1992. He completed his general surgery residency at İzmir Tepecik Training and Research Hospital between 1995-2000. In 2011, he received his education in the field of ERCP and Endoscopy at Afyon Kocatepe University. He worked as a specialist at Tepecik Training and Research Hospital, Karşıyaka State Hospital, Bakırçay University / Çiğli Training and Research Hospital between 2000-2021. He is a member of the Turkish Society of Surgery, Society of Endoscopic Laparoscopic Surgery, the bariatric and metabolic surgery society, and the Turkish Obesity Foundation. His special interest is Obesity Surgery. The father of 2 children, Opr. Dr. Abdulkadir Korkmaz has a good command of English. Areas of interest: Laparoscopic (closed) obesity (obesity) surgeries (sleeve – medicine stomach, gastric bypass) Gastric balloon application with endoscopic method in non-surgical obesity treatment Stomach Botox Application in the Treatment of Obesity Laparoscopic (closed) inguinal hernia surgeries Laparoscopic (closed) appendicitis surgeries Laparoscopic (closed) gallbladder surgeries Laparoscopic (closed) reflux - gastric hernia surgeries Goiter and Breast (breast cancer) surgeries Hemorrhoids treatment with laser Anescal surgery with laser
He graduated from Ege University Faculty of Medicine in 1991. In 1996, he became a General Surgery Specialist. In 2007, he received the Turkish Surgery Association Qualification (Board) Certificate. In 2007, he received the title of “Associate Professor of General Surgery”. In 2013, he became a Professor. He is an active member of International Society for Regional Cancer Treatment, Turkish Surgical Association, Turkish Colon and Rectal Surgery Association, Turkish Hepatopancreatobiliary Surgery Association, National Endoscopic Laparoscopic Surgery Association, Trauma and Emergency Surgery Association, Aegean Region Surgery Association, Izmir Breast Diseases Association, Turkish Surgical Association Competency Board, and Society of Dialogue in Endocrinology. He has more than 40 articles published in international indexed journals, more than 50 articles published in national journals. he has given more than 90 verbal and poster presentations in international and national congresses and symposiums and written two book chapters. He has won 6 awards in national and international congresses. Areas of interest: Obesity surgery and metabolic surgery, Laparoscopic reflux surgery, Laparoscopic gallbladder surgery, Stomach balloon application, Laparoscopic gastric and intestinal cancer surgeries, Haemorrhoid surgeries, Abdominal and inguinal hernia surgeries, Breast Cancer Surgery, Thyroid cancer and goitre surgery.   Prof. Dr. Hayrullah Derici is married and has two children. He speaks German and English well.
He was born in 1977 in Izmir. He graduated from Ege University Faculty of Medicine, and then he received his general surgery residency between 2000 and 2005 at Izmir Ataturk Training and Research Hospital. Assoc. Prof Ismail Yaman served as a general surgeon between the years of 2005 and 2009 in Manisa Public Hospital. In 2009, he started working as an Assistant Associate Professor in the Balıkesir University Faculty of Medicine where he had the opportunity to study Hiatus Hernia, Laparoscopic Colon Resection Surgery and the high level of Endoscopy which was accomplished for the first time here by himself. In 2013, Assoc. Prof Ismail Yaman was granted a patent with a device called “aspirasyon aparatı” (aspiration device) which was designed by himself. From 2010 to 2014, in order to get the training and experience in the high level of Endoscopy and Laparoscopic Colon Resection Surgery, he worked as a trainer in the field of Endoscopy at Istanbul Cerrahpaşa Faculty of Medicine, where he gained a trainer certificate in this field. In 2014, Assoc. Prof. Dr. Ismail Yaman became an Associate Professor. Since 2010 he has been giving highly effective lectures for undergraduate and postgraduate students. In addition, he has published numerous articles in both national and international scientific journals. His research interests are: Metabolic and Bariatric Surgery, Gastro Oesophageal Reflux, Gallbladder, Abdominal and Inguinal Hernia, Breast Cancer, Thyroid Cancer and Goiter Surgery.
He completed his medical education at Dokuz Eylul University Faculty of Medicine between 1995 and 2001. He specialized in General Surgery at Ankara Training and Research Hospital between 2001 and 2006. He worked as a General Surgery Specialist at Ankara Training and Research Hospital between 2006 and 2008 and later at Ordu State Hospital between 2008 and 2013. In 2016, he received the title of Associate Professor in the Department of General Surgery, Faculty of Medicine, Izmir University. In 2015, he received the Turkish Surgical Association Proficiency Exam (Board) Certificate of Achievement. He is a member of Turkish Surgical Association, Turkish Colon and Rectum Surgery Association, National Endoscopic Laparoscopic Surgery Association, Bariatric and Metabolic Surgery Association, and Hepatobiliary Surgery Association. Between 2014 and 2016, he taught many undergraduate and graduate courses at Izmir University Faculty of Medicine. He has conducted many national and international studies and these studies have received many citations. Assoc. Prof. Dr.  Ömer Yoldaş speaks English fluently. He has two children.   Knowledge Domain: Obesity Surgery and Metabolic Surgery, Laparoscopic Reflux Surgery, Laparoscopic Gallbladder Surgeries, Gastric Balloon Application, Gastric filler Application, Laparoscopic Gastric and Intestinal Cancer Surgeries, Haemorrhoid Surgeries, Perianal Fistula Surgeries, Laparoscopic Abdominal and Groin Hernia Surgeries, Breast Cancer Surgeries, Thyroid Cancer and Goitre Surgeries.
He graduated from Dokuz Eylül University, Faculty of Medicine. Between 1987 and 1991, he completed his specialization in general surgery at Buca SSK Hospital in Izmir. Between 1991 and 2016, he worked at Karşıyaka State Hospital, then until 2019 he worked as the General Surgery Specialist at Çiğli Training and Research Hospital. He is an active member of Turkish Surgical Association, Turkish Society of Colon and Rectal Surgery. He has experienced around 30,000 successful operations in the field of general surgery. Areas of interest: Laparoscopic gallbladder operations, gastrointestinal surgery, haemorrhoids and fissure surgeries, abdominal and inguinal hernia operations, breast cancer operations, thyroid cancer and goiter operations. Op. Dr. Attila El is married and has one child. He speaks fluent English.
He completed his medical education at Osmangazi University Faculty of Medicine between 1990 and 1996, and his residency in General Surgery at Izmir Training and Research Hospital between 2004 and 2008. In 2008, he received the Turkish Surgical Association's Qualification Exam (Board) certificate of success. He is a member of Turkish Surgical Association, Turkish Colon and Rectum Surgery Association, National Endoscopic Laparoscopic Surgery Association, Bariatric and Metabolic Surgery Association. He worked as a lecturer at Istanbul Rumeli University between 2017 and 2020. He currently performs Laparoscopic Oncosurgery and Obesity Surgeries. He has many national and international studies and these studies have received many citations.   Having a good command of English, Opr. Dr. Özgür Kavak is married and has two children.   Areas of interest: Laparoscopic Sleeve Gastrectomy, Laparoscopic Full Gastric Bypass, Laparoscopic Mini Bypass, Laparoscopic Type 2 Diabetes Surgery, Gastric Balloon Application with Endoscopic Method. In Non-Surgical Obesity Treatments:  Stomach filler (Endoscopic), Laparoscopic Oncology Surgery (Colorectal, Stomach, Pancreas, Adrenal), Reflux - Gastric Hernia Surgery (Laparoscopic), Minimally Invasive Surgery, Laparoscopic Hernia Surgery, Endocrine Surgery (Thyroid - Breast Surgery), Haemorrhoid Surgery with Laser, Haemorrhoidopexy (LHP), Perianal Fistula Surgery with FILAC (Fistula Laser Closure) Method.

Frequently Asked Questions

Ekol Hospitals Obesity Clinic has experienced Professor Doctors, Associate Professors, Specialists, nutritionists and dedicated nurses & care takers. Teamwork is really imported when it comes to bariatric surgeries and EKOL has the most experienced and Professional team working in harmony.
You will have a full check up before the operation, the results will be evaluated and your surgeon will decide to have the operation or not together with you. Full Urine Test, Blood Test, Chest Xray, Respiratory Function Test, Cardiology Consultation, Pulmonary Diseases Consultation, Internal Diseases Consultation, General Surgery consultation, anesthesia consultation, Ultrasonography. The operation ist mostly laparoscopic (closed) and takes around 80 – 90 minutes.
The stomach is cut in two in order to make its volume smaller. Then, small instine is connected to the small pouch which is left right after the esophagus. So the patient eats less and the consumed food is absorpted less, helping the patient lose weight.
You will stay at the hospital for 4 nights. You will have your last checks and controls before leaving the hospital and will be allowed to leave when everything is totally good and you feel fine. Our diet assistant, nutrition specialist will tell you your new nutrition plan and give you your diet plans. You will be asked to have regular blood tests in 1st, 3rd, 6th and 12th month after the operation. We will always keep in touch with you regarding your follow ups.
You might need to use vitamin supports for the rest ogf your life and you will ofcourse need to watch your nutrition. Consuming carbonhydrates, fizzy drinks, alcohol may led to weight gaining. With some metabolisms, the anostomosis point where the intestines are connected to stomach is widened and this might also cause weight gaining.
The prior choice is always the sleeve. A second bypass or sleeve after a previous bypass is always difficult and sometimes not possible.
Some patients might need esthetic operations such as tummy tuck, arm lift or thigh lift while same patients don’t need at all. It is all related to your metabolism, skin type and training. Our esthetic surgeons can help you with your requests after bariatric surgery and weight loss.