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New Research Suggests That Your Gut Bacteria Could Impact Your Decision-Making

May 23, 2024
in Science
New Research Suggests That Your Gut Bacteria Could Impact Your Decision-Making
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Gut Bacteria Microbiome Illustration

The intestinal microbiota significantly impacts mental and social health, influencing cognition, stress, and social interactions as evidenced by animal studies and emerging human research. Hilke Plassmann and colleagues found that dietary supplements affecting the gut microbiota can alter human decision-making in social contexts like fairness in the ultimatum game, suggesting potential pathways for future therapeutic exploration.

Research reveals that the gut microbiota affects mental health and social behavior, with studies showing that it can influence decision-making related to fairness, highlighting potential new therapeutic avenues.

The intestinal microbiota—comprising bacteria, viruses, and fungi in our digestive tract—plays a crucial role in our health, extending beyond digestion. Recent research highlights its influence on cognition, stress, anxiety, depressive symptoms, and behavior. For instance, mice raised in sterile environments show impaired social interactions.

While these findings are promising, most of this research is carried out on animals and cannot be extrapolated to humans. Nor does it allow us to understand what neuronal, immune, or hormonal mechanisms are at work in this fascinating dialogue between brain and intestine: researchers observe a link between the composition of the microbiota and social skills but do not know precisely how one controls the other.

“The available data suggests that the intestinal ecosystem communicates with the central nervous system via various pathways, including the vagus nerve,” explains Hilke Plassmann (Sorbonne University, Insead), head of the Control-Interoception-Attention Team at the Paris Brain Institute, and professor at Insead. “It might also use biochemical signals that trigger the release of neurotransmitters, such as dopamine and serotonin, which are essential for proper brain function.”

Studying altruistic punishment

To determine whether the composition of the human gut microbiota could influence decision-making in a social setting, the researcher and her colleagues used behavioral tests— including the famous “ultimatum game” in which one player is given a sum of money he must split (fairly or unfairly) with a second player, who is free to decline the offer if she deems it insufficient. In that case, neither player receives any money.

Refusing the sum of money is equivalent to what we call “altruistic punishment,” i.e. the impulse to punish others when a situation is perceived as unfair: for the second player, restoring equality (no one receives any money) sometimes feels more important than obtaining a reward. The ultimatum game is then used as an experimental way of measuring sensitivity to fairness.

Commensal Bacteria Intestine

Commensal bacteria (red) amongst the mucus (green) and epithelial cells (blue) in a mouse small intestine. Credit: University of Chicago

To fully exploit this effect, the researchers recruited 101 participants. For seven weeks, 51 took dietary supplements containing probiotics (beneficial bacteria) and prebiotics (nutrients that promote the colonization of bacteria in the gut), while 50 others received a placebo. They all participated in an ultimatum game during two sessions at the beginning and end of the supplementation period.

Are bacteria pulling the strings?

The study’s results indicate that the group that received the supplements was much more inclined to reject unequal offers at the end of the seven weeks, even when the money split was slightly unbalanced. Conversely, the placebo group behaved similarly during the first and second test sessions.

Moreover, the behavioral change in the supplemented group was accompanied by biological changes: the participants who, at the start of the study, had the greatest imbalance between the two types of bacteria that dominate the gut flora (Firmicutes and Bacteroidetes) experienced the most significant change in the composition of their gut microbiota with the intake of supplements. In addition, they also showed the greatest sensitivity to fairness during the tests.

The researchers also observed a sharp drop in their levels of tyrosine, a dopamine precursor, after the seven-week intervention. For the first time, a causal mechanism is emerging: the composition of the gut microbiota could influence social behavior through the precursors of dopamine, a neurotransmitter involved in brain reward mechanisms.

“It’s too early to say that gut bacteria can make us less rational and more receptive to social considerations,” concludes Hilke Plassmann. “However, these new results clarify which biological pathways we must look at. The prospect of modulating the gut microbiota through diet to positively influence decision-making is fascinating! We need to explore this avenue very carefully.”

Reference: “Impact of the gut microbiome composition on social decision-making” by Marie Falkenstein, Marie-Christine Simon, Aakash Mantri, Bernd Weber, Leonie Koban and Hilke Plassmann, 14 May 2024, PNAS Nexus.
DOI: 10.1093/pnasnexus/pgae166

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/new-research-suggests-that-your-gut-bacteria-could-impact-your-decision-making/

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