Hyperoxaluria in malabsorptive states.

During the last 10 years it has become apparent that hyperoxaluria often is present in malabsorptive states. This secondary hyperoxaluria could be explained by an increased uptake of dietary oxalate due to malabsorption of fatty acids and bile salts. Dietary prescriptions, including a low fat diet is advocated in the treatment of hyperoxaluria in Crohn's disease or after small bowel resection.