Gastric Sleeve vs Gastric Bypass: How They Compare

In a gastric sleeve, around 80% of the stomach is removed, leaving a narrow tube. The operation usually takes 1 to 3 hours.

In a gastric bypass, the top of the stomach is divided off to form a small pouch, which is joined to the small intestine so food bypasses most of the stomach. The operation usually takes around 2 hours.

Most people leave hospital 1 to 3 days after either operation, follow a liquid diet for two weeks and soft food after that, and return to normal activities after 4 to 6 weeks.

A bypass changes how nutrients are absorbed, so vitamin and mineral supplements and regular blood tests are usually needed for life. Supplements may also be needed after a sleeve.

Acid reflux can start or get worse after a sleeve gastrectomy, which is one reason the surgeon will ask about reflux before recommending an operation.

The right operation depends on your weight, conditions such as type 2 diabetes or reflux, and your eating habits. The surgeon recommends what's suitable after assessing you; nobody can guarantee a specific amount of weight loss.