Roux-en-Y gastric bypass (RYGB) is a type of metabolic and weight-loss surgery. It’s often done as a laparoscopic surgery, with minimally small incisions in the abdomen.
RYGB has both restrictive and malabsorptive effect. This surgery reduces the size of your upper stomach to a small pouch with volume size of 100-150ml. This limits the amount of food you can eat. The surgeon then attaches this pouch directly to part of the small intestine called the Roux limb. This forms a “Y” shape. The food you eat then bypasses the rest of the stomach and the upper part of your small intestine. This reduces the amount of fat and calories absorbed from food intake.
Gastric bypass surgery is used to treat severe obesity and poorly-controlled Type II diabetes. It is also helpful for patients with heartburn and reflux disease. RYGB can lower the risk for high blood pressure, high cholesterol, sleep apnea, and ischaemic heart disease. It will benefit for those who commit to a lifelong change in diet and exercise habits.
Before the surgery, you will have nutritional counseling to start on VLCD (Very Low Calorie Diet) to lose some weight. It will help to make your liver smaller and surgery safer. If you smoke, you will need to stop smoking to minimize risks of surgery.
You will be monitored in hospital for 3-5 day after the surgery. During recovery, you will have liquids diet for the 1st to 2nd weeks after surgery. It will slowly progress to soft diet and regular solid food about a month after surgery.
Your initial weight-loss will occur quickly, so it’s important to get all of the nutrition and vitamins you need as you recover. You will need lifelong vitamin and mineral supplements that your body may no longer absorb well from food alone. Regular blood test for nutritional deficiencies will be monitored to ensure your body is functioning at its optimum level.
During weight-loss, you may feel tired, muscle weakness, low energy, dry skin, mood changes, and temporary hair thinning. Weight loss continues for about a year, and then will stabilize. As your weight stabilizes, these problems should go away.
Your doctor will monitor potential risks of anastomotic leaks from the stomach pouch or the Roux limb, bleeding, infection, and blood clots in your legs that may occur after surgery. Other rare long-term risks including dumping syndrome (abdominal cramping, fainting and diarrhea after eating), stricture and internal herniation.
You may have other risks based on your health. Make sure to talk with your healthcare team about any concerns before the surgery.

Colorectal & General Surgeon

Upper Gastrointestinal, Bariatric & General Surgeon
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Our clinics will be closed from 16 – 18 Feb for CNY
Our clinic at Mt Alvernia Medical Centre A will be relocating from #06-05 to #03-03 (within the same building) on Friday, 26 Sep afternoon.
Our telephone line 6353 4855 will be temporarily unavailable from 12:00pm – 6:00pm on 26 September. During this period, you may reach out to our other clinics for assistance:
We will begin operations at our new premises (#03-03) from Tuesday, 30 Sep onwards.
We look forward to serving you at our new clinic!
Nexus Surgical clinics at Mt Elizabeth Novena Specialist Centre, Gleneagles Medical Centre, Parkway East Medical Centre and Mt Alvernia Medical Centre will be closed on 28 January 2025 for Lunar New Year celebrations, while our clinic at Mt Elizabeth Orchard Medical Centre remains open from 0900-1300 hours on 28 January 2025.
Please leave a message in our voice mails and we will respond to you as soon as we can when we resume our clinics on 31 January 2025. If you require any urgent assistance, kindly go to the Urgent Care Centre of any hospitals or contact your doctor through the Emergency Answering Service. Our team at Nexus Surgical would like to take this opportunity to wish you and your loved ones a Happy & Prosperous Lunar New Year with good health in the Year of the Snake!
Nexus Surgical will be away from 17 to 20 October 2024 for our Annual Company Retreat. The aim of our retreat is to review and to recharge, so that we may serve you better.
Our clinics at Mount Elizabeth Orchard, Mount Elizabeth Novena, Mount Alvernia and Parkway East hospitals will therefore be closed during this period. In the meantime, if you require any urgent assistance, kindly contact us through our Answering Service at +65 6333 5550.
We thank you for your understanding and patience for any inconvenience.