Daily Prebiotic Supplements Show Promise in Enhancing Cognitive Function in Older Adults

A recent study conducted by researchers at King's College London has revealed that daily protein and prebiotic supplements can improve memory test scores in individuals over the age of 60. This double-blind trial, which involved 36 pairs of twins, utilized two inexpensive plant-fiber prebiotics: inulin and fructooligosaccharide (FOS). Participants were randomly assigned to receive either the prebiotic supplements mixed into protein powder or a placebo. After three months, those consuming the prebiotics exhibited higher cognitive test scores, suggesting a potential link between gut health and brain function.

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Prebiotics are non-digestible fibers that stimulate the growth of beneficial gut microbes. The study's findings align with previous research indicating that high-fiber supplements can support the colon's microbiome, fostering the growth of "good" bacteria associated with improved cognitive function. The relationship between gut health and cognitive performance has led some experts to refer to the gut as the body's "second brain." However, the mechanisms behind this connection remain largely unexplained.

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The results of this study are particularly significant given the increasing prevalence of cognitive decline among older adults. Claire Steves, a geriatrician at King's College London, emphasized the affordability and accessibility of these plant fibers, stating they could benefit a wide demographic, especially in economically challenging times. While the study indicated improvements in cognitive function, it did not show significant physical benefits, such as muscle maintenance, among participants.

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Despite the promising results, the study has faced scrutiny regarding its methodology. The majority of participants were female, which may introduce selection bias, although the researchers adjusted for sex differences in their analysis. Furthermore, while the study suggests that cognitive decline may not solely be a brain disease, but also influenced by external factors, it did not explore the long-term effects of the supplements or their impact on larger populations.

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Mary Ni Lochlainn, a geriatric medicine researcher involved in the study, expressed optimism about the findings, highlighting the potential for enhancing brain health in the aging population. The next steps for researchers include investigating whether the cognitive benefits of prebiotics can be sustained over longer periods and in more diverse groups.

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While the study indicates a positive correlation between prebiotic intake and cognitive function, it does not provide comprehensive data on the physical health outcomes of participants. Additionally, the study's focus on a twin cohort may limit the generalizability of the findings.

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• “These plant fibers, which are cheap and available over the counter, could benefit a wide group of people in these cash-strapped times.” — Claire Steves, Geriatrician

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The study published in *Nature Communications* adds to the growing body of evidence supporting the gut-brain connection, suggesting that dietary interventions may play a crucial role in addressing cognitive decline in older adults.

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