What is a gastric sleeve? The history of gastric sleeve surgery
Gastric sleeve surgery, also known as laparoscopic sleeve gastrectomy, is a procedure in which a portion of the stomach is removed, leaving behind a smaller, tube‑shaped stomach that serves as the new functional pouch. The stomach normally acts as a temporary storage area for food and produces several hormones, including gastrin and ghrelin. Ghrelin plays a key role in triggering hunger, so removing a large section of the stomach can beneficially influence hunger hormone levels. After a gastric sleeve, patients eat less and feel full more quickly. This bariatric procedure can help individuals lose approximately 50 to 70 percent of their excess weight.
The development of gastric sleeve surgery can be viewed as an evolution of earlier anti‑reflux operations and gastroplasty techniques. The first duodenal switch was performed in 1988, eventually leading to the creation of the open gastric sleeve procedure. In 1999, surgeons performed the first laparoscopic gastric sleeve, allowing the operation to be done through several small abdominal incisions rather than a large open cut—an approach that remains standard today.
How is gastric sleeve performed?
Gastric sleeve surgery is carried out under general anesthesia and typically takes around two hours. Several small incisions are made in the abdominal area to allow the surgeon to insert a laparoscope and the instruments needed for the procedure. About 75% of the stomach is removed, and the remaining portion is closed using medical staples. To ensure there is no leakage once the patient begins eating again, the staple line is reinforced with manual sutures, and a fluid test is performed while the patient is still in the operating room.
The newly formed stomach takes on a narrow, sleeve‑like shape. It continues to function normally, allowing proper digestion, but the major change is a significant reduction in hunger and the ability to feel full more quickly, which helps patients eat smaller portions.
Who is a good candidate for gastric sleeve?
Not all individuals with obesity automatically qualify for gastric sleeve surgery. A trained physician will determine whether a patient meets the necessary criteria. However, there are general requirements that must be met before approval.
A suitable candidate is someone who has attempted to lose weight through healthy eating and exercise but has not achieved meaningful results. Typically, a patient should have a body mass index (BMI) of 35 or higher. Those with a BMI between 30 and 35 may also qualify if they have obesity‑related medical conditions such as type 2 diabetes or high blood pressure.
It is important to remember that the success of the surgery depends heavily on the patient’s dedication to adopting new habits and following medical guidance throughout recovery. A positive and committed approach to both physical and psychological well‑being is essential.
How is sleeve different from bypass?
There are several bariatric procedures available, and while gastric sleeve and gastric bypass surgeries share similarities in recovery time, potential risks, and expected weight‑loss outcomes, the way each operation is performed is quite different.
The benefits of gastric sleeve surgery
- Gastric sleeve surgery is a transformative procedure that enables patients to lose more than 60% of their excess body weight.
- Research shows that substantial weight reduction can lead to remission of several serious health conditions, including high blood pressure, diabetes, sleep apnea, heart failure, osteoarthritis, and chronic back pain.
- Many patients also report feeling more energetic and motivated, which encourages them to participate in new physical activities and maintain a healthier lifestyle.
How to prepare for gastric sleeve surgery? What tests are needed?
Weight‑loss surgery is a major life decision, and patients must be mentally prepared as well. The process extends far beyond the operation itself and requires long‑term lifestyle adjustments that are essential for successful recovery and lasting results.
- Consultation
The first step is meeting with a general practitioner, who will assess eligibility and emotional readiness. This is important because obesity may be linked to stress, emotional eating, or binge‑eating behaviors, which sometimes require different treatment approaches.
- Preparation
Preparation may begin up to a year before surgery, during which patients are often encouraged to lose 5–10% of their body weight. A multidisciplinary team—including a bariatric physician, dietitian, and psychologist—will create a personalized treatment plan and monitor progress throughout the pre‑surgery period. Developing healthy habits early helps ensure steady weight loss and smoother recovery.
- Smoking
Patients must stop smoking at least four weeks before surgery and ideally quit permanently afterward, as smoking restricts blood flow and increases the risk of complications.
- Medication
Any medications—especially blood thinners—should be reviewed with the doctor a few weeks before the procedure.
- Tests
Pre‑operative testing typically includes blood work such as a complete blood count, as well as an electrocardiogram and gastroscopy. Depending on the individual case, the surgeon may request additional tests.
- Diet
Two weeks before surgery, patients must follow a specific low‑calorie diet. The goal is to reduce liver size by decreasing fat around it, making it easier for the surgeon to access the stomach. To prevent regurgitation, no food should be consumed for six hours before the operation.
What are the risks of gastric sleeve surgery?
Choosing an experienced surgeon and following the treatment plan closely can significantly reduce the risk of complications. Avoiding smoking and committing to a healthy lifestyle further lowers the likelihood of problems. Potential risks include:
- Acid reflux
A smaller stomach may allow gastric acid to move into the esophagus, irritating its lining. For this reason, antacid medication is usually recommended for at least the first three months.
- Staple line leaks
Leaks can occur if the body does not fully seal the staple line used to close the stomach. Reinforcing the staples with additional stitching greatly minimizes this risk.
- Blood clots
Blood clots may form during anesthesia or recovery because blood flow slows down. Early walking and avoiding smoking help prevent this complication.
- Dumping syndrome (rare)
Dumping syndrome happens when food enters the small intestine too quickly.
– Early dumping occurs when a rapid influx of food draws fluid from the bloodstream into the intestines, causing bloating and diarrhea.
– Late dumping results from carbohydrates breaking down too quickly, leading to sudden changes in blood sugar levels.
Careful portion control and gradual introduction of new foods can help prevent these symptoms.
What to expect after gastric sleeve surgery?
- Patients typically stay in the hospital for several days after the procedure.
- Initially, pain relief is provided intravenously. Upon discharge, patients receive oral pain medications to use at home.
- Showering should be avoided for 48 hours, and baths, pools, and hot tubs should be avoided for four weeks or until the incisions are fully healed. The healthcare team will provide detailed wound‑care instructions.
- Most people return to normal daily activities within 1–2 weeks but should avoid strenuous exercise and sports for about two months. Gradually incorporating regular physical activity—such as walking or swimming—supports long‑term weight loss.
- A structured diet plan must also be followed, which is explained below.
What will I be able to eat after gastric sleeve surgery?
- Right after the surgery
Only clear liquids are allowed immediately after the procedure. Sugar should be avoided to reduce the risk of dumping syndrome. Coffee may worsen acid reflux and should be limited. Carbonated drinks should be avoided because they cause gas. While still in the clinic, patients begin trying puréed foods and low‑fat yogurt. A puréed diet is usually recommended for about four weeks.
- Six weeks after surgery
During this stage, patients should consume baby food or homemade vegetable and lean‑meat purées, low‑fat yogurt without chunks, protein shakes, and clear homemade broth. Soft fruits such as baked or puréed apples, peaches, or pears may be added, preferably earlier in the day due to their sugar content. If protein intake is insufficient, protein powder can be added to meals. Coffee or tea should be limited to two cups daily, and water intake should reach at least 1.5 liters of still water per day. Meals should be eaten slowly and chewed thoroughly, lasting at least 20 minutes.
While still on puréed foods, patients should choose unseasoned, caffeine‑free, sugar‑free, low‑fat options. Protein intake should increase by week three. Additional foods may include protein shakes, boiled or cooked eggs, jarred baby foods, puréed fish, avocados, hummus, mashed bananas, and other non‑fibrous fruits.
- After a month
Semi‑solid foods can be introduced gradually, transitioning toward solid foods. Suitable choices include well‑cooked chicken, fish, vegetables, sweet potatoes, low‑fat dairy products, and low‑sugar cereals—initially mashed with a fork. High‑fat foods, steaks, fibrous fruits, white potatoes, and other high‑carb items should still be avoided. Caffeine may be reintroduced in moderation.
Long‑term success depends on maintaining healthy eating habits. From week five onward, new foods can be added, with a continued focus on lean protein and vegetables. Sugary foods and drinks should still be avoided. Patients should learn to distinguish emotional eating from true hunger and stay well‑hydrated.
Will I need to take vitamins and supplements after sleeve surgery?
To maintain proper nutrition, specific vitamin supplements will be prescribed starting about one month after surgery. Clinically tested vitamins are recommended over inexpensive gummy multivitamins, which often lack essential nutrients.
Commonly prescribed supplements include multivitamins with iron, vitamin D, vitamin B12, and calcium first year after surgery. Annual blood tests are recommended to monitor vitamin levels and adjust supplementation as needed.
