A UK study suggests that psychological distress experienced across adulthood may be linked to poorer later-life cognitive health and an increased risk of dementia, highlighting the potential importance of mental health for brain health across the life course. The findings, published in Alzheimer’s & Dementia, come from analysis of five UK longitudinal cohort studies and were led by Jean Stafford, Advanced Care Research Centre and Alzheimer’s Society Fellow at the Usher Institute. The research adds to growing evidence that mental health and cognitive ageing are closely connected.Key findingsResearchers found that people who experienced psychological distress tended to have poorer cognitive outcomes in later life and higher odds of developing dementia. These associations were seen across a wide range of symptoms, including both clinically significant distress and milder or subclinical experiences.Both intermittent and persistent distress were associated with adverse cognitive outcomes, suggesting that even non-chronic symptoms may be relevant for long-term brain health across the life course. Our findings suggest that psychological distress across adulthood may be linked to poorer cognitive health in later life, including dementia. Given that symptoms such as low mood and anxiety are common in the population, these findings highlight the potential importance of mental health for later brain health. They may also have relevance for dementia prevention research and earlier identification of people at increased risk. Dr Jean Stafford Advanced Care Research Centre, Usher Institute Timings of distress and dementia riskWhen looking at timing, associations between psychological distress and dementia were observed when distress was measured at ages 55–64 and 65–75, but not at ages 45–54. The authors suggest this pattern may indicate that psychological distress in later midlife could, in some cases, represent early markers of dementia risk rather than solely a causal risk factor.What this meansThe research highlights that symptoms such as low mood, anxiety and worry - which are common across the population - may have relevance for understanding population-level differences in cognitive health. It also raises questions about whether psychological distress could, in some cases, form part of the early changes seen in the development of dementia.The authors note that these findings may have implications for dementia prevention research and for efforts to identify individuals at higher risk of cognitive decline earlier in the disease pathway.Cite as Stafford J., Dekhtyar S., Russ T. C., et al. Longitudinal associations of psychological distress with subsequent cognitive decline and dementia: a multi-cohort study. Alzheimer's Dement. 2026;22:e71093. https://doi.org/10.1002/alz.71093Further informationLongitudinal associations of psychological distress with subsequent cognitive decline and dementia: a multi‐cohort study | Alzheimer's & Dementia | Wiley Online Library Advanced Care Research Centre | Usher Institute Publication date 22 Apr, 2026
