Sleeve gastrectomy is one of the most common surgical procedures performed today for patients that undergo bariatric surgery. One of the primary reasons for morbid obesity is unhealthy eating habits and the belief that changes in those habits can ensure the success. Objectives: The investigators aimed to explore the effect of different eating habits prior to the bariatric surgery on the surgery success and on different aspect of quality of life. Design: The investigators conducted this study on patients that underwent sleeve gastrectomy as the first bariatric operation.