Nearly two thirds of American adults are either overweight or obese. 
Accordingly, bariatric surgery experienced explosive growth during the past 
decade. Current estimates place the worldwide volume of bariatric procedures at 
greater than 300,000 cases annually. Micronutrient deficiencies are 
well-described following bariatric surgery, and they may present with 
devastating and sometimes irreversible neurologic manifestations. Clinical 
symptoms range from peripheral neuropathy to encephalopathy, and are most 
commonly caused by thiamine, copper, and B(12) deficiencies.