Preoperative Use of Liraglutide Additionally to Common Dietological Measures as Opposed to Dietological Measures Alone

The aim of the study is to investigate the effects of preoperative Saxenda (liraglutide). There are two groups, one group receives Saxena in addition to dietary measures, one group only diet. Each group will have a waiting period of 6 months until the operation will be done. The investigator wants to elaborate how much additional preoperative weight loss is possible with the drug. The greater the preoperative weight loss, the lower the risk of the operation. After one year, the investigator will also check whether the weight loss has been maintained and whether the preoperative Saxenda continues to lose even more weight after the operation. All patients looking for bariatric surgery with health insurance via Österreichische Gesundheitsklasse and BMI\>35kg/m2 will be asked to take part in this study. Patients with previous bariatric surgeries or contraindications against liraglutide will be excluded from this study.