http://www.medscape.com/viewarticle/814 ... uac=9310BX
Probiotics may offer an alternative treatment option for depression and other psychiatric disorders, new research suggests.
Investigators reviewed studies that examined the effect of "psychobiotics," live organisms that when ingested may produce health benefits in patients suffering from mental illness.
Several preclinical studies showed a link between specific probiotics and beneficial behavioral effects. These included one in which rats with depressive behaviors resulting from maternal separation displayed normalized behavior and an improved immune response after ingesting the Bifidobacterium infantis probiotic.
"Increasingly, patients are reluctant to take antidepressants, and psychobiotics may become an alternative," Ted Dinan, MD, PhD, professor of psychiatry and from the Alimentary Pharmabiotic Centre at University College Cork in Ireland, told Medscape Medical News.
Dr. Dinan noted that there are approximately 1 to 2 kg of bacteria in the adult gut that are capable of producing hundreds of essential chemicals. And although healthy aging is associated with a diverse range of these organisms, individuals who age in an unhealthy manner have a much less diverse range of bacteria.
"Our preclinical studies suggest that depression is also associated with an alteration in the microbiota. Psychobiotics are good bacteria that have the potential to increase microbial diversity and treat the symptoms of depression," he said.
The review is published in the November 15 issue of Biological Psychiatry.