Multiple studies show link between thiamine deficieny and psychosis

I did a search on pubmed, and there are a lot of articles on this.

There seems to be particulary a link between malnutrition and/or alcohol abuse and lack of thiamine. Alcohol depletes thiamine.

Here is a recent article I found: Anorexia nervosa and Wernicke Korsakoff’s syndrome: atypical presentation by acute psychosis - PubMed (nih.gov)

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