Good gut bacteria in newborn boys equates to better cognition: study

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What goes on in your stomach can affect your brain, shows research out of the University of Alberta linking a species of gut bacteria to enhanced cognition and language skills in infant boys.

The U of A-led research followed more than 400 infants from the CHILD Cohort Study at its Edmonton site, finding that the boys with a gut bacterial composition high in Bacteroidetes at one year of age had advanced cognition and language skills one year later, said a press release from the university.

“It’s well known that female children score higher (at early ages), especially in cognition and language,” said Anita Kozyrskyj, a professor of pediatrics at the U of A and principal investigator of the SyMBIOTA (Synergy in Microbiota) laboratory. “But when it comes to gut microbial composition, it was the male infants where we saw this obvious connection between the Bacteroidetes and the improved scores.

“The differences between male and female gut microbiota are very subtle, but we do know from CHILD Cohort Study data that girls at early ages are more likely to have more of these Bacteroidetes. So perhaps most girls have a sufficient number of Bacteroidetes and that’s why they have improved scores over boys.”

The researchers, led by Kozyrskyj and associate professor of pediatrics Piush Mandhane, studied bacteria found in fecal samples from the infants and identified three different groups exhibiting similar dominant clusters of bacteria. They then evaluated the infants on a variety of neural developmental scales. Of those groups, only the male infants with Bacteroidetes-dominant bacteria showed signs of enhanced neurodevelopment.

The research replicates similar findings from a U.S. study that also showed an association between Bacteroidetes and neural development.

Kozyrskyj said Bacteroidetes are one of a very few bacteria that produce metabolites called sphingolipids, instrumental for the formation and structure of neurons in the brain.

“It makes sense that if you have more of these microbes and they produce more sphingolipids, then you should see some improvement in terms of the formation of neuron connections in our brain and improved scores in cognition and language,” she said.

But caesarean birth is one factor that can significantly deplete Bacteroidetes, adds Kozyrskyj.

Factors that positively influence gut microbiota composition in infants, meanwhile, include breastfeeding, having a high-fibre diet, living with a dog and being exposed to nature and green spaces.

While the findings don’t mean children with a lower proportion of Bacteroidetes will remain behind peers in later childhood or adulthood, the study offers early promise to potentially identify children at risk of neurodevelopmental disorders.

The research team will continue to follow the infants participating in CHILD to determine whether the findings can be predictive of autism or attention deficit/hyperactivity disorder. They are also examining other factors that may have an impact on neurodevelopment in infants, including stress and gut colonization by the bacterium Clostridium difficile.

“Over the first one to two years of life, your brain is very malleable,” said Kozyrskyj. “Now we’re seeing a connection between its malleability and gut microbiota, and I think that is very important.”

The study, “Bacteroides-dominant gut microbiome of late infancy is associated with enhanced neurodevelopment,” was published in the journal Gut Microbes.

Funding for the study was provided by the Canadian Institutes of Health Research, the Stollery Children’s Hospital Foundation and Alberta Women’s Health Foundation through the Women and Children’s Health Research Institute, and the Allergy, Genes, and Environment (AllerGen) Network of Centres of Excellence.

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