Table 3: Specific neurological complications associated with vitamin deficiencies after bariatric surgery.


Vitamin A10%Xerophthalmia, night blindness, and decreased immunity
Vitamin B1“Common”Wernicke’s encephalopathy, Korsakoff syndrome, and Beriberi (dry/wet)
<1% symptomatic
Vitamin B1230–70%Myelopathy, neuropathy, dementia, and depression
Folate1–10%Macrocytic anemia and fatigue may aggravate B12 deficiency
Vitamin D50–60%Myopathy
Vitamin ERarePeripheral neuropathy, myopathy
CopperRare because undiagnosedMyelopathy, sensory ataxia
Vitamin B214%Burning feet syndrome
Vitamin B617%Polyneuropathy