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In page Wernicke–Korsakoff syndrome:

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As stated above, Wernicke–Korsakoff syndrome in the United States is usually found in malnourished chronic alcoholics, though it is also found in patients who undergo prolonged intravenous (IV) therapy without vitamin B1 supplementation, gastric stapling, intensive care unit (ICU) stays, hunger strikes, or people with eating disorders. In some regions, physicians have observed thiamine deficiency brought about by severe malnutrition, particularly in diets consisting mainly of polished rice, which is thiamine-deficient. The resulting nervous system ailment is called beriberi. In individuals with sub-clinical thiamine deficiency, a large dose of glucose (either as sweet food, etc. or glucose infusion) can precipitate the onset of overt encephalopathy.[1][2][3]