question: Is oxalate renal excretion increased after bariatric surgery?
answer: Bariatric surgery is associated with a significant risk of nephrolithiasis.
  Enteric hyperoxaluria, nephrolithiasis, and oxalate nephropathy must be considered with the other risks of bariatric surgery
  Hyperoxaluria in patients treated with bariatric surgery was found to be a result of hyperabsorption of oxalate