Narrative review links personality traits to Alzheimer's disease risk and cognitive outcomes
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Key Takeaway
Consider personality traits as potential indicators for Alzheimer's disease risk, noting observational links without proven causality.
This is a narrative review that synthesizes observational evidence on the association between personality traits and Alzheimer's disease outcomes. The authors report that high neuroticism and low conscientiousness are consistently associated with an increased risk of Alzheimer's disease, cognitive decline, mild cognitive impairment, and dementia. Conscientiousness is associated with reduced risk of cognitive decline and greater cognitive resilience. Extraversion and openness show variable and context-dependent associations with Alzheimer's disease risk, while agreeableness demonstrates weak and inconsistent relationships.
The review does not report pooled effect sizes, sample sizes, or specific study populations, as these details were not provided in the source. The authors note that longitudinal studies provide the strongest evidence for these associations. They acknowledge that personality traits may act as premorbid risk or protective factors rather than solely reflecting disease-related changes.
Limitations of the evidence base were not detailed in the source. The authors suggest personality traits have potential utility in early risk identification and prevention strategies, but this remains an observational association without proven causal pathways.
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View Original Abstract ↓
The relationship between personality traits and Alzheimer’s disease (AD) has received increasing attention in recent research. A narrative literature search was conducted in PubMed (2014–2025) using predefined keywords, with studies selected based on relevance and methodological quality. Personality traits—particularly high neuroticism and low conscientiousness—have been consistently associated with an increased risk of AD, influencing both its onset and clinical progression. Neuroticism emerges as the most robust and consistent risk factor, linked to accelerated cognitive decline, increased risk of mild cognitive impairment (MCI), and dementia through biological, psychological, and behavioral pathways. In contrast, conscientiousness appears to exert a protective effect, being associated with reduced risk of cognitive decline and greater cognitive resilience, likely mediated by health-related behaviors and neurobiological mechanisms. Extraversion and openness show more variable and context-dependent associations, with some evidence suggesting protective roles through social engagement and cognitive reserve, whereas agreeableness demonstrates weak and inconsistent relationships with AD risk. Longitudinal studies provide the strongest evidence, indicating that personality traits act as premorbid risk or protective factors rather than solely reflecting disease-related changes, while cross-sectional findings primarily capture the clinical phenotype of AD. Overall, personality traits contribute to individual differences in vulnerability to cognitive decline, highlighting their potential utility in early risk identification and prevention strategies.
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