How the Gut Influences Brain Development in Babies

Andy Hab
3 min readSep 27

Are you suggesting that the gut influences the brain — how on earth can that happen?

Yes, but when I say the gut I mean specifically the microbiome of the gut — that is the collection of bacteria in our guts. Which are plentiful.

What, our gut bacteria can help with brain development?

Yes, this has been well-documented in recent years. We all have hundreds and thousand of different strains of bacteria in our guts. And the balance of these seem to have a surprisingly large impact on our health. And that includes brain health and in this case brain development.

How on earth can that happen?

Well, there are multiple ways and we are not sure exactly how all of these work. But an example is that a class called bacteroidetes produce metabolites called sphingolipids, which are instrumental in the formation and structuring of neurons in the brain.

So, a healthy balance of bacteroidetes is a massive bonus of the developing brain (actually any brain).

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Oh wow, and what did these researchers find?

In this exploratory study, published in PLOS in August, Sebastian Hunter et al. found that certain bacterial strains were associated with increased cognitive functionality but they also measured brain processing responses (to sounds) in babies 4–6 months old.

They found that those with higher, or lower, proportions of certain strains performed better and had more rapid brain responses.

Specifically, if you’re interested in the details, negatively to Bifidobacterium, and positively to the abundance of Clostridium and Enterococcus.

Ok, and do they know why?

There are multiple ways that your gut bacteria can influence your health but they did note a positive association with metabolic pathways — and this included, for example, if you want to know the technical details, something called branched chain amino acid biosynthesis and the pentose phosphate pathway.

Basically stuff that helps with brain development.

Andy Hab

Sharing fascinating, fun, and important knowledge on the brain and human behaviour - most days. And masters track athlete - still going strong!