Gastric sleeve gastrectomy is an obesity surgery performed by surgically removing approximately 80% of the stomach. The newly formed stomach causes less food intake due to its significantly reduced volume compared to the normal stomach. The secondary weight loss mechanism is the absence of the release of the hunger hormone called “GHRELIN”. Gastric sleeve surgeries are also performed with the laparoscopic method. Surgery is performed by entering the abdominal cavity through small incisions.