Gut Microbiota Influence on Cognitive Function
Summary
The human gastrointestinal tract hosts a diverse microbial ecosystem whose metabolic and immunomodulatory outputs exert profound effects on brain function. Bidirectional communication along the gut–brain axis involves neural, endocrine, metabolic and immune pathways. Microbial metabolites such as short-chain fatty acids modulate synaptic plasticity and neuroinflammation, while the integrity of the intestinal barrier influences systemic inflammation and blood–brain barrier permeability. Dysbiosis, or perturbation in microbial composition, has been linked to impairments in learning, memory and executive function across the lifespan and in neurological disorders such as Alzheimer’s disease and depression. Diet, antibiotics, stress and host genetics shape microbial communities, suggesting avenues for intervention. Preclinical and emerging clinical studies indicate that modulation of microbiota through probiotics, prebiotics and dietary fibre may restore cognitive performance by enhancing neurotrophic signalling, reducing neuroinflammation and preserving synaptic integrity. This research has global implications for public health, offering novel preventive and therapeutic strategies against cognitive decline associated with ageing and metabolic disease.
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Gut Microbiota Influence on Cognitive Function publication trend
The graph below shows the total number of articles in gut microbiota influence on cognitive function across all publications each year (not limited to Nature Index journals).
Technical terms
Gut–brain axis: The bidirectional communication network linking the gastrointestinal tract and the central nervous system through neural, hormonal, immune and metabolic pathways.
Gut microbiota: The community of microorganisms residing in the gastrointestinal tract, including bacteria, fungi and viruses, that influence host physiology and metabolism.
Short-chain fatty acids: Microbial fermentation products such as acetate, propionate and butyrate that modulate immune responses and neuronal function.
Synaptic plasticity: The ability of synapses to strengthen or weaken over time, underlying learning and memory processes.
Neuroinflammation: Inflammatory responses within the brain, often mediated by glial cells, which can impair neuronal health and cognition.
Dysbiosis: An imbalance in the composition or function of the gut microbiota associated with disease states.
References
- A high‐salt diet induces synaptic loss and memory impairment via gut microbiota and butyrate in mice. iMeta (2023).
- Dimethyl itaconate ameliorates cognitive impairment induced by a high-fat diet via the gut-brain axis in mice. Microbiome (2023).
- Butyrate ameliorates quinolinic acid–induced cognitive decline in obesity models. Journal of Clinical Investigation (2023).
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