Abnormal intestinal permeability. An aetiological factor in chronic psychiatric disorders

Abnormal intestinal absorption has been suggested as an aetiological factor in schizophrenia. A procedure for investigating intestinal permeability was carried out in a group of chronic psychiatric in-patients. A proportion of the subjects studied showed abnormal intestinal permeability which could not be attributed to established bowel disease. Patients who were receiving neuroleptic but not anticholinergic drugs were those most often showing abnormal intestinal permeability. This work is at an early stage of development but preliminary findings suggest that further investigations should be carried out to establish the circumstances in which changes in intestinal permeability may be associated with mental illness.