Probiotics helpful in treating depression: Study

According to a new study, adults with irritable bowel syndrome (IBS) reported improvements from co-existing depression, when they took a specific pro-biotic than adults with IBS who took a placebo.

This new study is the first to show improved depression scores with a pro-biotic.

The research was published in journal Gastroenterology.

"The study provides further evidence of the microbiota environment in the intestines being in direct communication with the brain," said senior author Dr. Premysl Bercik, an associate professor of medicine at McMaster and a gastroenterologist for Hamilton Health Sciences.

Adding, "This study shows that consumption of a specific probiotic can improve both gut symptoms and psychological issues in IBS. This opens new avenues not only for the treatment of patients with functional bowel disorders but also for patients with primary psychiatric diseases."

IBS is the most common gastrointestinal disorder in the world, and is highly prevalent in Canada. It affects the large intestine and patients suffer from abdominal pain and altered bowel habits like diarrhea and constipation.

They are also frequently affected by chronic anxiety or depression.

The research involved 44 adults with IBS and mild to moderate anxiety or depression.

They were followed for 10 weeks, as half took a daily dose of the probiotic Bifidobacterium longum NCC3001, while the others had a placebo.

At six weeks, 14 of 22, or 64 percent, of the patients taking the probiotic had decreased depression scores, compared to seven of 22 (or 32 percent) of patients given placebo.

Functional Magnetic Resonance Imaging (fMRI) showed that the improvement in depression scores was associated with changes in multiple brain areas involved in mood control.

"This is the result of a decade long journey, from identifying the probiotic, testing it in preclinical models and investigating the pathways through which the signals from the gut reach the brain," shared Bercik.

"The results of this pilot study are very promising but they have to be confirmed in a future, larger scale trial," noted Dr. Maria Pinto Sanchez, the first author and a McMaster clinical research fellow.