To Evaluate If Preoperative 7 Days Low Calorie Diet Reduces Postoperative Morbidity in Liver Surgery

The rationale for this study is to evaluate whether a standardized, preoperative, short-term Low Calorie Diet (LCD) reduces intraoperative bleeding and postoperative morbidity in liver surgery. Participants with a BMI of 30 or higher, scheduled for liver surgery, if accepting participation, will be randomized to a 7 day LCD or no intervention. A previous small single center RCT have shown significantly reduced intraoperative blood loss and a tendency towards less postoperative complications. This multi-centre study aims to include enough patients with power to analyze also postoperative complications.