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Psychosis is a psychiatric syndrome marked by loss of contact with reality, defined in the DSM-5-TR by delusions, hallucinations, disorganized speech, disorganized or catatonic behavior, and negative symptoms. It’s a symptom dimension, not a single diagnosis — it appears in schizophrenia-spectrum disorders, mood disorders with psychotic features, substance/medication-induced psychosis, and psychosis due to a medical condition. Nutritional psychology studies it as an outcome linked to nutrient deficiencies (notably B12/folate), inflammation, and gut-microbiota changes, rather than as a focal condition of the field.
Author and reviewer
Editorial responsibilityReferences and further reading
- Arciniegas DB. Psychosis. Continuum (Minneap Minn). 2015;21(3 Behavioral Neurology and Neuropsychiatry):715-736. doi:10.1212/01.CON.0000466662.89908.e7. PMID:26039850. View source
How to cite this entry
CNP (2026). Psychosis. In CNP Encyclopedia Editorial Board (Eds.), Encyclopedia of Nutritional Psychology. The Center for Nutritional Psychology.
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