how it works
How Gastric Sleeve Surgery Works
Understanding how gastric sleeve surgery works helps patients make informed decisions about their weight loss treatment. Gastric sleeve surgery, also known as sleeve gastrectomy, is one of the most effective procedures used to treat obesity and related metabolic conditions.
At our Los Angeles practice, Dr. David Davtyan, MD, FACS, FICS, performs advanced minimally invasive bariatric procedures designed to help patients safely lose weight and improve overall health. Dr. Davtyan is board certified by the American Board of Surgery and the American Board of Obesity Medicine, and has extensive experience treating obesity through surgical and medical approaches.
Patients considering sleeve gastrectomy often first explore gastric sleeve surgery and other forms of bariatric surgery to determine which treatment option best fits their health goals.
What Happens During Gastric Sleeve Surgery
Gastric sleeve surgery works by removing approximately 75–80% of the stomach, leaving a narrow tube or “sleeve” shaped stomach.
The procedure is typically performed using laparoscopic surgery, a minimally invasive technique that uses small incisions and specialized surgical instruments.
During the procedure:
- The surgeon removes a large portion of the stomach
• The remaining stomach is reshaped into a narrow sleeve
• The digestive tract remains intact without rerouting the intestines
Because the stomach is significantly smaller, patients are able to eat smaller portions and feel satisfied more quickly.
Patients can also learn more about the different types of bariatric surgery when exploring weight loss treatment options.
How Gastric Sleeve Surgery Promotes Weight Loss
Gastric sleeve surgery helps patients lose weight through several biological mechanisms.
Reduced Stomach Capacity
Because the stomach is smaller, patients cannot eat large meals. This naturally reduces calorie intake and supports long-term weight loss.
Hormonal Changes
The portion of the stomach removed during surgery produces much of the body’s ghrelin, the hormone responsible for triggering hunger.
By reducing ghrelin production, patients often experience decreased appetite after surgery.
Improved Metabolic Function
Weight loss after sleeve gastrectomy frequently leads to improvements in metabolic health and obesity-related conditions.
These improvements contribute to the many benefits of bariatric surgery and the specific benefits of gastric sleeve surgery.
How Long Gastric Sleeve Surgery Takes
Gastric sleeve surgery typically takes about 60 to 90 minutes to complete.
Most patients remain in the hospital for one to two days after surgery so the medical team can monitor recovery and ensure patients are able to tolerate fluids.
Minimally invasive techniques allow patients to recover more quickly and return to normal activities sooner.
Patients can learn more about gastric sleeve recovery and the overall bariatric surgery recovery process.
Who Performs Gastric Sleeve Surgery
Choosing an experienced bariatric surgeon plays an important role in safety and long-term success.
Dr. David Davtyan received his medical education at the UCLA School of Medicine and completed advanced surgical training at internationally recognized institutions including M.D. Anderson Cancer Center and the John Wayne Cancer Institute.
His expertise in minimally invasive surgery allows him to perform gastric sleeve procedures with a strong focus on patient safety, precision, and long-term outcomes.
Patients interested in surgery can also learn who qualifies for bariatric surgery and explore gastric sleeve surgery candidates.
Risks of Gastric Sleeve Surgery
Like all surgical procedures, gastric sleeve surgery carries potential risks.
Possible complications may include:
• Infection
• Bleeding
• Digestive changes
• Nutritional deficiencies
However, modern minimally invasive techniques have significantly improved safety.
Patients can learn more about the risks of gastric sleeve surgery and the general risks of bariatric surgery.
Results Patients Can Expect
Most patients experience substantial weight loss within the first year after surgery.
On average, patients lose 50–70% of excess body weight within 12–18 months after gastric sleeve surgery.
Patients can explore real gastric sleeve weight loss results and view bariatric surgery before and after results.
Start Your Weight Loss Journey
Understanding how gastric sleeve surgery works helps patients feel confident about their treatment decisions.
A consultation with Dr. David Davtyan allows patients to discuss their health history, weight loss goals, and determine whether gastric sleeve surgery may be the best treatment option.
