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.