This study aims to investigate whether a specific protein in the blood, called resistin, can help doctors predict how much dangerous internal fat a patient will lose following weight loss surgery. Sleeve gastrectomy is a common and effective procedure that reduces the stomach's size to help patients lose weight and improve their metabolic health. Beyond just losing weight, it is vital to reduce visceral fat-the fat stored around internal organs-which is closely linked to inflammation and conditions like Type 2 Diabetes. Resistin is a marker known to contribute to insulin resistance and is typically higher in individuals with significant abdominal fat. By measuring resistin levels before surgery, we want to determine if this protein can serve as a guide to predict a patient's internal fat loss and overall metabolic recovery. Ultimately, this research could help healthcare providers better understand the hormonal changes that occur during weight loss and identify which patients may experience the most significant health improvements after the procedure.

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