{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T09:02:26Z","timestamp":1790240546759,"version":"4.1.0"},"reference-count":108,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Population ageing is associated with a rising burden of cognitive decline, dementia and late-life affective disorders. Grape- and wine-derived (poly)phenols represent a chemically diverse group of bioactives whose biological relevance is shaped by structural complexity, the intervention matrix, host conjugation and gut microbial metabolism. Rather than acting as simple antioxidants, these compounds and their derived metabolites may influence interrelated pathways implicated in brain ageing, including neuroinflammation, endothelial function, synaptic plasticity, oxidative stress and gut-brain axis signalling. The gut microbiota is central to this framework as it converts poorly absorbed parent compounds into smaller phenolic metabolites and is modulated by (poly)phenol exposure. This review summarises the chemical and bioavailability features that determine intestinal and colonic availability, evaluates preclinical evidence concerning the neuroprotective potential of grape- and wine-derived (poly)phenols, and integrates clinical evidence from studies of cognitive ageing, mild cognitive impairment and Alzheimer\u2019s disease. Current evidence supports biological plausibility and justifies further investigation, but clinical findings remain heterogeneous. Future studies should prioritise chemically standardised preparations, metabolomic profiling, functional microbiome readouts, and integrated cognitive, vascular and inflammatory endpoints.<\/jats:p>","DOI":"10.3390\/nu18193144","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T08:06:37Z","timestamp":1790237197000},"page":"3144","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Do Grape- and Wine-Derived (Poly)Phenols Contribute to the Hallmarks of Healthy Brain Ageing?"],"prefix":"10.3390","volume":"18","author":[{"given":"Ayman","family":"Ben Mohamed","sequence":"first","affiliation":[{"name":"Norwich Medical School, University of East Anglia, Norwich NR4 7TJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5952-8756","authenticated-orcid":false,"given":"David","family":"Vauzour","sequence":"additional","affiliation":[{"name":"Norwich Medical School, University of East Anglia, Norwich NR4 7TJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e105","DOI":"10.1016\/S2468-2667(21)00249-8","article-title":"Estimation of the global prevalence of dementia in 2019 and forecasted prevalence in 2050: An analysis for the Global Burden of Disease Study 2019","volume":"7","author":"Nichols","year":"2022","journal-title":"Lancet Public Health"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1146\/annurev-publhealth-031811-124544","article-title":"Early Intervention to Reduce the Global Health and Economic Burden of Major Depression in Older Adults","volume":"33","author":"Reynolds","year":"2012","journal-title":"Annu. 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