Celiac Disease Linked to Psychotic Symptoms and Vitamin B12 Deficiency.
A case report has highlighted the association between cobalamin (vitamin B12) deficiency and psychotic symptoms in a patient with celiac disease. The 75-year-old woman presented with auditory hallucinations, persecutory delusions, thought broadcasting, and insomnia. Laboratory investigations detected mild anemia and cobalamin deficiency, but were unremarkable for other causes of psychosis. After starting olanzapine and cobalamin replacement, she had a good clinical response with full remission of delusions in 5 days. She remained symptom-free at several follow-up assessments with her community mental health team and maintained normal cobalamin levels as monitored by her primary care team.