Gut Bacteria May Reshape Brain Function Across Species, Study Finds

New research suggests a surprising connection between gut bacteria and brain function. Scientists have found that microbes in the digestive system may influence how the brain operates, even across different species. The findings could open fresh avenues for studying human brain-related diseases and cognitive health.

In a series of experiments, mice received gut microbes from primates, including humans and macaques. Those implanted with microbes from primates with larger brains later showed brain activity patterns resembling their donors. This shift was observed in gene expression, indicating that the gut microbiome directly affected brain function and energy use.

The study did not identify specific gene expression differences between human and macaque gut microbes in the mice. Nor did it pinpoint exact changes in neuronal functions or synapses. However, the results align with broader research suggesting that gut bacteria may shape brain activity by producing compounds that interact with the nervous and immune systems. In humans, these microbes are thought to influence brain function through neurotransmitters like serotonin and dopamine. The findings reinforce the idea that cognitive health depends on complex interactions between the brain, immune system, and gut.

The research highlights a potential link between gut bacteria and brain function, one that may extend to humans. While the exact mechanisms remain unclear, the study provides a foundation for further investigation into brain-related conditions. Future work could explore how targeting gut microbes might support cognitive health or treat neurological disorders.