What Is Gastric Sleeve Surgery?
Gastric sleeve surgery, also known as sleeve gastrectomy, is a weight-loss procedure in which approximately 75–80% of the stomach is removed. The remaining stomach is shaped into a narrow tube. The intestines are not rerouted.
Because the stomach is smaller, patients feel full after eating less. The procedure can support obesity treatment when combined with healthy eating, physical activity and ongoing medical follow-up.
Who May Be a Candidate for Gastric Sleeve?
Sleeve gastrectomy may be considered for people living with obesity-related health problems or those who have not achieved lasting weight loss with non-surgical approaches. Eligibility is not determined by weight or BMI alone. A medical team also considers overall health, obesity-related conditions, previous weight-loss attempts and readiness for long-term follow-up.
Whether surgery is appropriate for you can only be determined after a specialist assessment and the necessary tests.
What Is the Minimum BMI for Gastric Sleeve Surgery?
BMI is calculated by dividing weight in kilograms by height in metres squared: BMI = weight (kg) ÷ height² (m).
Current international guidelines recommend metabolic and bariatric surgery for people with a BMI of 35 kg/m² or higher. For people with a BMI of 30–34.9 kg/m², surgery may be considered by a specialist when obesity-related conditions such as type 2 diabetes are present or non-surgical treatment has not achieved substantial, lasting results.
BMI is only one part of the assessment. Individual eligibility depends on health status, clinical findings and local criteria.
Pre-operative Assessment
Before surgery, the team reviews your medical history, medications and current symptoms. Blood tests and other investigations may be arranged. Conditions such as diabetes, high blood pressure, sleep apnoea, reflux and fatty liver disease are considered when planning treatment.
Your doctor and dietitian will explain preparation and the nutrition plan for after surgery.
How Is Gastric Sleeve Surgery Performed?
The procedure is usually performed laparoscopically through several small abdominal incisions. The surgeon removes most of the stomach and shapes the remaining portion into a sleeve. The intestines are not altered.
Operating time, hospital stay and discharge plans vary according to each patient’s needs.
Recovery and Diet After Gastric Sleeve Surgery
After surgery, the care team monitors your recovery. Your diet usually progresses in stages, beginning with liquids, then puréed foods and soft foods, before returning to regular textures when your team considers it appropriate. Timing varies, so follow the plan provided by your surgeon and dietitian.
Eat small portions slowly, chew thoroughly and drink enough fluids. Gentle walking may begin early, with activity increased gradually as advised.
Will I Need Vitamin and Mineral Supplements?
Lower food intake can increase the risk of some vitamin and mineral deficiencies. Regular blood tests and supplements recommended by your care team are important.
Weight Loss After Gastric Sleeve
The amount and pace of weight loss vary from person to person. Starting weight, health, eating habits, activity and follow-up all influence results. No specific amount of weight loss can be guaranteed. Ongoing care and sustainable lifestyle changes are important parts of treatment.
Risks and Considerations
Gastric sleeve is major surgery. Potential risks include bleeding, infection, blood clots, anaesthesia-related complications and leakage along the staple line. Later issues may include new or worsening acid reflux, narrowing of the stomach, nausea or vomiting, and vitamin or mineral deficiencies.
The removed part of the stomach cannot be restored. Discuss potential benefits and risks with a specialist who can consider your individual health.
Learn More About Gastric Sleeve Surgery
Contact our team to find out whether sleeve gastrectomy may be suitable for you and to learn about the treatment journey. Our specialists can review your health, needs and expectations and provide information tailored to your case.
Medical note: This page is for general information and does not replace medical advice, diagnosis or treatment. Surgical eligibility must be determined by a qualified specialist.
