[Folic acid deficiency in chronically hospitalized mental patients].

Studies over the past 30 years have shown a relationship between folic acid deficiency and psychopathology. FA deficiency was observed more often in depressed and in psychotic patients, in alcoholics, in those suffering from organic mental disorders and in the psycho-geriatric population. In a chronic inpatient population of 120 patients, of the 106 in whom FA serum levels were examined, only 1 had a definitely subnormal level.