Bariatric surgery is an effective method for treatment of obesity. Sleeve gastrectomy is one of surgical methods and became popular in recent years. Weight loss rates after bariatric surgery differs among patients. The exact reason of this difference stays unclear. age, nationality, difference between body composition and type of surgery may be in concern. waist to height ratio has become popular recent years as an indicator of cardiomethabolic status. in this study, investigation of the effect of waist to height ratio differences of patients on weight loss following laparoscopic sleeve gastrectomy as a bariatric surgery.

Waist to height raito is the major determinator of patients and will be noted in every patient who will fulfil the eligibility criteras defined below and undergo laparoscopic sleeve gastrectomy. demographic data, BMI, body lipid composition, lean body weight also will be noted. all patients will undergo standardized laparoscopic sleeve gastrectomy operation. patients will be follow up during first, third, sixth and one year periods. all parameters noted preoperatively will be measured and noted again. possible statistical difference will be calculated statistically and a cut off value will be seeked.

Inclusion Criteria:

• 18-65 years old
• BMI>40 kg/m2
• Sleeve gastrectomy operation planned patients

Exclusion Criteria:

• Type 1 or 2 diabetes mellitus
• osteoarticular pathology that may restrict postoperative regular physical activity.
• apparent mental or psychological disorder that may affect postoperative recommendations
• refusal of informed consent for this study