Laparoscopic Gastric Bypass (LGB) or Laparoscopic Roux-en-Y Gastric Bypass is a complex and non-reversible procedure that helps severely obese patients to lose lot of excess weight. The American societies for Bariatric Surgery and the National Institute of Health have rated Roux-en-Y Gastric Bypass as the current gold standard procedure for weight loss surgery. In this procedure, a small stomach pouch (15 to 20 cc size) is created by stapling a section of the stomach so that the food directly enters into the lower portion of the jejunum, bypassing the beginning of the small intestine, hence reducing calories absorption. The remainder part of the stomach is stapled, not removed, and separated from the stomach pouch.

This results in reduced appetite and satisfaction of hunger with smaller portion of diet. It is estimated that in post Laparoscopic Roux en y gastric bypass, one can lose 60-80% of excess weight in about 2 years time.