Wernicke's Encephalopathy and Korsakoff Syndrome.

Precipitating conditions.

Chronic Alcoholism.
Prolonged starvation
Hyperemesis Gravidarum
HIV AIDS
Bariatric surgery
Prolonged intravenous hyperalimentation
Hemodialysis for CRF
Malignancies - Gastric Carcinoma.

All these factors precipitate Thiamine deficiency and cause the Syndrome.