A recent study conducted on mice has found that age-related changes in the gut may contribute to a decline in cognitive abilities. Researchers suggest that shifts in digestive system function over time could play a significant role in how the brain processes and retains information.
According to the study, the ageing digestive system produces molecules that suppress the activity of the vagus nerve—a key communication pathway between the gut and the brain. Disruption of this connection may negatively affect brain function, particularly in areas associated with memory and learning.
The research also identified an increase in the abundance of a microbe known as Parabacteroides goldsteinii with advancing age. This bacterium produces compounds called medium-chain fatty acids (MCFAs), which were found to play a central role in the observed effects.
Elevated levels of these fatty acids can activate immune cells in the gut, triggering the production of inflammatory molecules. One such molecule, Interleukin-1 beta, was shown to impair the function of the vagus nerve.
Findings from the study indicate that this disruption may interfere with communication between the gut and the hippocampus—the region of the brain responsible for memory formation—thereby contributing to cognitive decline. Researchers emphasise that these results highlight the complex relationship between gut health and brain function, particularly as the body ages.
