The PREBA Study: Effect of Preoperative Weight Loss With a 14-day Low-calorie Diet on Surgical Procedure and Outcomes in Patients Undergoing RYGB Surgery

Exclusion Criteria

• •Undergoing another bariatric procedure than primary RYGB.
• •Diabetes Mellitus
• •Contraindication for the usage of Modifast meal replacements:
• •* Allergy or intolerance to any substance in the used meal replacements (Soy, milk, gluten, egg, peanuts, nuts and seeds)
• •* Veganism
• •* Kidney failure (GFR \< 90 ml/min/1.73m2), liver failure or cardiac insufficiency
• •* A heart attack (myocardial infarct) in the past twelve months
• •* Cancer
• •* Hypokalaemia: serum potassium level \<3.4 mmol/l
• •* Phenylketonuria \& Porphyria