What is Gastric Bypass Surgery?

Gastric bypass surgery is one of the techniques of Bariatric surgery which helps in fast weight loss especially in morbid obese people.

Principle of gastric bypass surgery

In gastric bypass surgery the purpose is to reduce the size of a stomach as well as resection of a part of the small intestine which leads to decreased absorption of food, calories and nutrients. One of the most common types of gastric bypass surgery is Roux-en-Y gastric bypass in which a small pouch of a stomach is created with the help of a stapler device and a distal small intestine is anastomosed with the new pouch of a stomach. In this way a small sized stomach is created and that pouch is connected with the far distal part of the small intestine, bypassing the duodenum and some part of jejunum which are vital parts for digestion and absorption of food. By Roux-en-Y gastric bypass surgery following benefits are achieved:

  • The size of a stomach is reduced and a very small sized stomach is formed which has a very small capacity for food and it helps in early satisfaction and decreased food intake.
  • An important and vital part of small intestine i.e. duodenum and some part of jejunum are bypassed. Duodenum is important for digestion of food and jejunum is essential for absorption of food. When these parts are bypassed a large volume of food is not properly digested and reabsorbed which leads to decreased caloric intake.

By these mechanisms food intake is decreased as well as digestion and absorption of food is reduced. Hence, it helps in faster weight loss than any other Bariatric surgical procedures.


Evidence based studies supporting gastric bypass for fast weight loss

During the last decade gastric bypass surgery remained the most commonly performed surgery for fast weight loss. Only in USA about 140,000 gastric bypass surgeries performed during 2005, reducing the number of all other Bariatric surgical procedures. It is now considered as a gold standard surgery for fast weight loss.


Any Bariatric surgical procedure performed usually has one mechanism, either restrictive or malabsorptive, but Roux-en-Y gastric bypass surgery is a unique procedure which is restricted due to decreased stomach size and malabsorptive because of bypass of duodenum and proximal part of jejunum. There is no doubt in the benefits of gastric bypass surgery in fast weight loss, additionally gastric bypass surgery has very few side effects as compared to other Bariatric surgical procedure.

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