All patients were subjected to thorough history, clinical examination and laboratory investigations including basic preoperative investigations, lipid profile, thyroid and suprarenal hormonal evaluation. In addition, patients may undergo further assessment for pulmonary functions or gastroesophageal disease including endoscope. . Abdominal ultrasound was done to exclude calcular cholecystitis and to evaluate the degree of fatty liver. Reduction the size of fatty liver was done by putting all patients on low-calorie protein diet for 6 weeks. Deep vein thrombosis prophylaxis started 12 h before surgery with low molecular weight heparin subcutaneous injections . Preoperative data included age, gender, initial weight, initial body mass index (BMI), obesity comorbidities and treatment medications used (chest problems, diabetes, arterial hypertension and cardiac ischaemia, hyperlipidemia, obstructive sleep apnea syndrome, gall stones, urinary stress incontinence, joint pain, depression, infertility and heart burn). Postoperative data included hospital stay, early postoperative complications during the first month (e.g. fever, collection, bleeding, vomiting, leak and port site problems .Long-term complications more than 1 month after surgery (e.g. nausea, vomiting, reflux, stricture, intestinal obstruction , hypoalbuminemia , anemia and calcium or iron or vitamin D , vitamin B12 deficiency and), excess weight loss and BMI were collected.
