How can long-term alcohol use lead to Korsakoff syndrome?

Long-term alcohol use leads to Korsakoff syndrome primarily through the development of a severe thiamine (vitamin B1) deficiency.123

This deficiency occurs because chronic alcohol consumption often leads to poor nutritional habits, as alcohol provides empty calories that lack essential nutrients. Furthermore, heavy drinking can cause digestive difficulties that prevent the body from properly absorbing necessary vitamins.45

When this deficiency becomes chronic, it can result in neurological damage, often manifesting as Wernicke-Korsakoff syndrome. While Wernicke disease involves acute damage to the nervous system, Korsakoff syndrome is characterized by severe, persistent amnesia and memory impairment. Because this condition stems from nutritional neglect and metabolic disruption, it is a serious medical consequence of long-term alcohol abuse that requires urgent intervention.13524