The male patient, diagnosed with
schizoaffective disorder, with a prior psychiatric history of attention deficit hyperactivity
disorder and major depression,
experienced «dramatic» reductions in auditory hallucinations and delusions, as well as better mood and energy on the ketogenic diet.
Patients had to fulfil the following criteria: a diagnosis of schizophrenia,
schizoaffective psychosis, or delusional
disorder according to criteria from the Diagnostic and Statistical Manual of Mental Disorders, 3rd edition, revised11; no evidence of organic brain disease; substance abuse not identified as the primary problem; age between 18 and 65 years; presence of persistent hallucinations or delusions, or both, for a minimum of 6 months and at least 1 month of stabilisation if they had
experienced an exacerbation during this period; stable medication; no psychological or family intervention; their responsible medical officer had given permission for them to enter the study; no serious threat of violence towards the assessors; and they had given informed consent to participate.