Gut microorganisms and human behavior
There is an interesting story that played on National Public Radio this morning, “Gut bacteria might guide the workings of our mind.” An audio link to the radio program can be found on their website. The story details work by Dr. Emeran Mayer, at the UCLA medical school. He has been working to correlate magnetic resonance imaging (MRI) scans with specific microbial fingerprints of gut flora from normal, random volunteers, and looking for areas of the brain that are associated with certain kinds of normal bacteria. The premise behind this is that the brain responds to hormonal and neurological cues from the gut, and the types of microorganisms in the gut play a direct role in the types of cues. Future directions for the research suggest that scientists might be able to modulate behavior by altering the types of gut bacteria (via probiotics) or by drugs that mimic the effects of the bacteria. One active area of research in this is towards correcting the effects of autism by altering the diet, an avenue that has already shown promise in mice. Other published research by Mayer has shown that sections of the brain associated with anxiety have been affected by probiotic diet. Findings such as these will continue to forcefully dispel the notion that our normal microbiota are not merely passengers on our bodies, but active participants influencing all aspects of our biology.
Click here to watch a video at NPR about this.