A 42-year-old man developed a myopathy in the setting of malnutrition follo
wing Roux-en-Y gastric bypass for the treatment of morbid obesity. No speci
fic vitamin or electrolyte deficiency was identified. Muscle biopsy reveale
d type II fiber atrophy. He recovered after the initiation of continuous en
teral feeding. We suggest that malnutrition was the underlying cause of his
myopathy. (C) 2001 John Wiley & Sons, Inc.