A 24-year-old man comes to the physician for a routine health maintenance examination. He has no past medical history. Physical examination shows vitiligo on the hands. He does not adhere to any specific dietary regimens.
Which of the following is most likely to be seen in this patient?
Abnormal D-xylose test
Antibodies directed against gastric chief cells
Decreased spinothalamic tract function
Increased serum homocysteine
Normal serum methylmalonic acid
