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Sleeve gastrectomy
The most commonly performed weight loss operation in the United States. About 80% of the stomach is removed, the intestines are left alone, and hunger drops sharply for most patients.
What the operation involves
The sleeve gastrectomy is performed laparoscopically, through several small incisions. Using a surgical stapler, roughly 80% of the stomach is divided away along its outer curve and removed from the body. What remains is a narrow vertical tube — the sleeve — running from the esophagus to the outlet of the stomach.
Nothing is rerouted. The intestines are untouched, and food travels the same path it always did, through a much smaller stomach.
Most sleeve operations take about an hour. Most patients stay one night in the hospital and return to desk work within one to two weeks.
Why it produces weight loss
Two things happen. The obvious one is capacity: a much smaller stomach means much smaller meals before you feel full.
The less obvious one matters more to many patients. The portion of the stomach removed is the primary site of ghrelin production — the hormone that drives hunger. Patients frequently describe the change not as willpower but as the constant background noise of appetite going quiet. That effect softens over time but does not disappear.
What results look like
Published series generally report loss of about 25 to 30 percent of total body weight in the first one to two years. For a patient starting at 300 pounds, that is roughly 75 to 90 pounds.
Weight loss is fastest in the first six months, continues more slowly through the first year to eighteen months, and then stabilizes. Some regain after the low point is normal and expected. Significant regain usually reflects a return to prior eating patterns rather than a failure of the operation.
Type 2 diabetes, high blood pressure, sleep apnea, and joint pain all improve substantially in many patients, often before much weight has come off.
Nothing about this operation removes the need to change how you eat. The sleeve makes the change achievable. It does not make it automatic, and it can be eaten around.
Risks worth understanding
Sleeve gastrectomy is a safe operation in experienced hands, with serious complication rates comparable to gallbladder surgery. Safe is not the same as risk-free.
- Staple line leak. The most serious specific complication, occurring in roughly 1 to 2 percent of cases. A leak requires prompt treatment and sometimes reoperation, and it is the main reason the first days after surgery are watched closely.
- Bleeding from the staple line, occasionally requiring transfusion or reoperation.
- Stricture — narrowing of the sleeve, causing difficulty keeping food down. Usually treatable endoscopically.
- New or worsened acid reflux. This is the sleeve's most important long-term drawback. A minority of patients develop reflux severe enough to need daily medication, and some eventually need conversion to a gastric bypass. If you already have significant GERD, the sleeve may be the wrong operation for you.
- Nutritional deficiency if supplements are neglected — less demanding than after a bypass, but not optional.
General surgical risks apply as well: infection, blood clots, hernia at incision sites, and anesthesia complications.
The part that is permanent
The removed stomach is gone. The sleeve cannot be reversed. It can be converted to a gastric bypass or another operation later if there is a good reason, but you should choose it as a permanent decision.
Who tends to do well with a sleeve
- Patients who want an effective operation without intestinal rerouting
- Patients on medications where absorption changes after bypass would be a problem
- Patients with extensive prior abdominal surgery making bypass technically difficult
- Patients with inflammatory bowel disease, where bypass is generally avoided
- Patients who prefer a simpler long-term supplement and monitoring routine
When to think hard about the bypass instead
- You have significant acid reflux or a known hiatal hernia
- You have long-standing or insulin-dependent type 2 diabetes
- Your BMI is very high and you want the greater average weight loss
If a sleeve has already been done and has not produced enough weight loss, SADI-S can complete it as a second stage rather than starting again.
Read about the gastric bypass → · Compare both side by side →
Is the sleeve right for you?
Bring your questions. The consultation is a full hour, one-on-one with Dr. Geller, and the goal is a decision you understand rather than one you were sold.