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Sleeve gastrectomy, also referred to as vertical sleeve Sleeve gastrectomy, also referred to as vertical sleeve, gastric sleeve or tube gastrectomy, is a surgical procedure performed for the treatment of obesity. The procedure is a restrictive bariatric surgery to treat extremely obese patients with a high BMI of 40 and above. http://www.nobesity.in/sleeve-gastrectomy.html encourages weight loss by restricting the stomach size so it holds only a limited amount of food.