About this trial
Standard dietary regiments for bariatric are advised prior to surgery. The most used diet is a very low calorie diet (VLCD). These diets potentially have multiple pittfalls.
Very low-calorie ketogenic diets (VLCKD) have been proposed as a new regimen for achieving weight- and liver volume loss in patients undergoing bariatric surgery. The beneficial effect of VLCKDs compared to (V)LCDs is the aimed preservation of FFM and RMR, while still reducing FM. Only a few small studies addressed the role of VLCKDs prior to bariatric surgery, and the data including FFM and FM is actually scarce. Therefore, a well-designed randomised controlled trial is necessary to establish the efficacy of a VLCKD.
Eligibility criteria
Qualifiers
Eligible for bariatric surgery (≥35 kg/m2 with obesity-related comorbidities, or a BMI of
40 kg/m2 with or without comorbidities)
Roux-en-Y Gastric bypass (RYGB)
Disqualifiers
Weighing over 150kg because this amount is a limitation by the DXA device
Diabetes mellitus type 1
Allergic to milk proteins
A recent history of a heart attack (< 12 months), heart failure or cardiac arrhythmias
Trial design
Treatments tested in this trial
- VLCKD (ketogenic diet)
- VLCD (Very-low-calorie-diet)