Scientists at The Ohio State University have been exploring the ties between gut bacteria and impulsive behavior, and they may have found a dietary intervention that could offer some relief to those suffering from the long-term effects of a traumatic brain injury (TBI). As reported by OSU News, recent research conducted on rats indicates that incorporating the prebiotic galacto-oligosaccharide (GOS) into the diet might just help to reduce impulsivity, a symptom commonly observed following a moderate TBI.
This development could potentially provide a glimmer of hope for the over 11 million Americans dealing with disabilities related to TBIs, as noted by the Brain Injury Association of America. The prebiotic seemed to directly affect the rats' impulse control, allowing them to better wait for cue lights in a gambling task. "We found in this study that their impulse control has improved," Cole Vonder Haar, assistant professor of neuroscience in the Ohio State College of Medicine, told OSU News. His team's work was presented at Neuroscience 2025, the annual meeting of the Society for Neuroscience.
In the study, rats were subjected to diet regimens either standard or supplemented with 2% GOS beginning six weeks before a simulated injury and continued for a subsequent 60 days. Their behavior was then meticulously assessed across various domains, including anxiety, learning and memory, as well as impulsivity and decision making. The rats consuming the GOS showed clear improvements in their impulsiveness post-TBI relative to those on the non-supplemented diet.
"It's a modest effect. They're still more impulsive than control animals without injury, but it's reduced compared to their counterparts," Vonder Haar emphasized. The results of this research suggest that, while not a complete solution, dietary prebiotics could potentially be used to partially mitigate some of the chronic impairments faced by TBI patients. Vonder Haar also chaired a minisymposium on the gut microbiome’s relation to TBI and is the lead author of an article in the Journal of Neuroscience reviewing the evidence on the gut as a modulator of TBI. "We know what the behavioral outcome from TBI looks like, but the mechanism, why and how this is happening, is the other big question,” he explained to OSU News.
With nearly 3 million TBI-related emergency visits recorded annually in the United States alone, these findings, funded by the U.S. Department of Defense, could hold significance for the future treatment strategies of TBIs. The ongoing analysis of such interventions may eventually pave the way for therapeutic options that go beyond the current symptom management approach, which often comprises rehabilitation and pharmacological treatments for associated conditions, such as depression. The efficacy and scope of prebiotics in this arena are still unfolding, yet the study presents an intriguing nexus between nutrition, microbiome health, and brain injury recovery.
