Severe peripheral neuropathy following gastric bypass surgery for morbid obesity.

Severe weakness in the limbs developed in a young woman 3 1/2 months after successful gastric bypass surgery for morbid obesity. Electromyography confirmed the clinical impression of generalized axonal polyneuropathy. Vitamin B replacement therapy was started. The gastric bypass was not reversed, and the patient continued to lose weight while undergoing rehabilitation. After 10 months she had almost fully recovered. Her total weight loss was 76 kg. Neuropathy is an uncommon but serious complication of semistarvation that should be preventable by routine administration of vitamin B complex.