Idiopathic fasting hypoglycemia in an adult

A 73-year-old man with documented and persistent fasting hypoglycemia for at least 22 years underwent extensive study including percutaneous liver biopsy for measurement of selected enzymes. No known cause of fasting hypoglycemia could be found. This is believed to be the first reported case of "idiopathic" fasting hypoglycemia in an adult. At the present time, it is not possible to classify the cause of this patient's hypoglycemia due to incomplete understanding of the abnormalities of carbohydrate metabolism.