This weight-loss operation combines removal or exclusion of 2/3rds of the stomach along with a long intestinal bypass which significantly reduces the absorption of fat. The capacity to eat is greater than with the other operations, and the eventual weight loss is the best of all the operations but if fatty foods are overeaten e.g. a hamburger and fries then diarrhoea and foul flatus will result.

Sometimes it is offered to patients as part of a two stage Bypass operation particularly if they are super obese ( BMI>60) because it allows good weight loss until the patient gets down to a safe weight and the more radical bypass can then be offered laparoscopically when they are at a safer weight.
The residual stomach capacity is about 200mls so a generous entree should be possible.
The weight loss seems to be of the same order as a LAP-BAND® procedure ( 50-60% EWL) over two years but it is not adjustable.
It might also be a good option if patients have a problem with their Laparoscopic Band requiring revision, have already lost a lot of weight and don't want a full bypass.
▶ Laparoscopic Adjustable Gastric Banding
:: ▶ Sleeve Gastrectomy or Gastroplasty
:: ▶ Gastric Roux-En-Y Bypass