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Gastric Sleeve (Sleeve Gastrectomy)
A gastric sleeve is a weight-loss operation that removes a large part of the stomach, leaving a slim tube. You feel full sooner and eat less, leading to significant weight loss.
Causes & risk factors
- Considered for severe obesity (usually BMI 40+, or 35+ with illness)
- When diet, activity and medicine have not achieved enough weight loss
- To improve type 2 diabetes, sleep apnoea and other conditions
- A smaller stomach reduces hunger and portion size
Common symptoms
- This is a procedure page, not a disease
- It treats severe obesity and related conditions
- Feeling full after small meals afterwards
- Steady weight loss over the following months
Tests & diagnosis
- CBC
- HbA1c
- LFT
- Nutritional and vitamin levels
- Endoscopy and heart/anaesthetic assessment before surgery
Treatment & management
- Keyhole surgery to remove about 75-80% of the stomach
- A liquid then soft diet, progressing to small solid meals
- Lifelong vitamin and mineral supplements
- Regular follow-up with the surgical and dietitian team
- Ongoing healthy eating and activity to keep the weight off
When to see a doctor urgently
- Severe or persistent tummy pain, vomiting or fever after surgery — seek urgent care
- Difficulty swallowing or keeping fluids down
- Signs of a nutritional deficiency during follow-up
- To discuss whether you are suitable for the operation
Frequently asked questions
Is a gastric sleeve reversible?
No. Because part of the stomach is removed, it cannot be reversed, unlike a gastric band. It is a permanent change, so the decision is made carefully with your team.
How much weight will I lose with a sleeve?
Most people lose a large share of their excess weight over 12-18 months. Results depend on sticking to the recommended eating and activity habits afterwards.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.