The Roux en-Y Gastric Bypass, is considered the “gold standard” of modern obesity surgery. The RNY Gastric Bypass is a restrictive procedure combined with a modified gastric bypass that moderately limits calorie and nutrient absorption and may lead to altered food choices. This procedure works by decreasing food intake, limiting the amount of food the stomach can hold by closing off a significant portion of the stomach and delaying the emptying of the stomach (gastric pouch). This procedure is a combination of restriction and malabsorption and therefore has a two-way weight reducing effect.

How it works

The small intestine is cut about 18 inches below the stomach, and is arranged to provide an outlet to the small stomach, while maintaining the flow of digestive juices at the same time. The lower part of the stomach is bypassed, and food enters the second part of the small bowel.The first figure (Picture on top right) shows the oesophagus, the stomach and the small intestine. The R-en-Y Gastric Bypass achieves its effects by creating a very small (around 1 ounce about the size of an egg) stomach pouch from which the rest of the stomach is permanently divided and separated. Below the staple line the stomach keeps obtained but no food will enter here. The stomach will still produce gastric juices and enzymes essential for digestion and absorption of nutrients.


The operation works by reducing food intake, and reducing the feeling of hunger. The result is a very early sense of fullness, followed by a very profound sense of satisfaction. Even though the portion size may be small, there is no hunger, and no feeling of having been deprived.

The Gastric Bypass provides an excellent tool for gaining long-term control of weight, without the hunger or craving usually associated with small portions, or with dieting.

Weight loss of 75 – 80% of excess body weight is achievable for most patients, and long-term maintenance of weight loss is very successful. It does, however, require adherence to a simple and straightforward behavioural plan.

Six months and twelve months after surgery, and later on a yearly basis patients need a blood test monitored by their GP to control if do not develop any shortage in any important vitamin or mineral.

After your discharge from hospital you will be required to remain within the vicinity of the Hospital for 3-4 days prior to being given clearance by the surgeon to return to your home. The surgeon will have appointed one of his nurses to visit you in a hotel of your choosing for regular check-ups during this period.