How bacteria in your gut affect your mental health

Scientists searching for theunderlying causes of mental illness havediscovereda surprising contributor it appears the bacteria that live in your gut may play a major role in your mental health and well-being.

CBC Radio science columnist TorahKachurspoke to researchers such as Karen Madsen at the University of Alberta who are studyingthe types of bacteria that live in your gut and how they affectyour behaviour,via a nerve that travels between the gut and the brain.

"You know the whole term, 'listen to your gut'? Its kind of taking on a whole new meaning,"Kachur told Rebecca Zandbergen, host of CBC's Radio West.

• Hear the full interview with Torah Kachur, including a description of the research and some tips to nurture gut bacteria that will make you happier

Kachur explainedthat there are "good" bacteria, likeBifidiobacteriumandLactobacillus,that are present in yogurt. They produce a happy signal called GABA, which acts onthe nervous system to curb depressive symptoms and anxiety.

Meanwhile, "bad" bacteria like theClostridiumfamily, of botulism fame, live in our guts and dine on our Western diets of high fat, high sugar and processed foods, Kachur said. She added that these bacteria canproduce toxins that are released into the bloodstream and could affect the brain.

Kachur recommends eating food high in probiotics, such asyogurt, sauerkraut, kimchiandmiso soup; and avoiding high fat and high sugar diets, in order to promote the growth of bacteria that are good for your mental health.

"We've got to nurture and take care of our microbes."