The study aims to find out if a specific blood test, measuring the balance between two hormones (adiponectin and leptin), can predict how much weight a person might lose after sleeve gastrectomy, a surgery for obesity. The investigators want to see if this hormone ratio can help identify who will benefit most from the surgery. If the investigators find that people with a low hormone ratio are less likely to lose weight after surgery, doctors can guide them toward other weight-loss options, like lifestyle changes or different treatments, instead of surgery. This way, patients can get the care that's best for them.

The subject of the research is to investigate whether preoperative adiponectin-leptin ratios are predictive of weight loss in patients undergoing sleeve gastrectomy for morbid obesity. If the study finds the adiponectin-leptin ratio to be a significant predictor of weight loss, individuals with a low preoperative ratio, which are expected to lose less weight following surgery, can be redirected to more suitable treatment options other than sleeve gastrectomy. This will allow patients less likely to benefit from surgery to be guided toward conservative approaches.

Inclusion Criteria:

• Patients aged 18 to 75
• International Classification of Diseases (ICD) code E66 diagnosis (obesity)
• Patients who have given consent for sleeve gastrectomy
• Patients who are suitable for general anesthesia

Exclusion Criteria:

• Patients who did not give consent to be included in the study
• Patients who are scheduled for surgery other than sleeve gastrectomy

Patients applying to Başakşehir Çam Sakura City Hospital General Surgery Clinic for bariatric surgery