Observational studyScientific reports2025
Association between dietary copper intake and cognitive function in American older adults: NHANES 2011-2014.
Observational study in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
2 citing papers in PubMed.
- Association of dietary copper intake with Alzheimer's disease, brain structure and cognitive function.The journal of nutrition, health & aging · 2026Article
- Nuclear accumulation of PANK4 in hippocampal astrocytes aggravates cuproptosis in association with mild cognitive impairment in aged mice.Frontiers in aging neuroscience · 2026Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This cross-sectional observational study examined the association between dietary copper intake and cognitive function in American older adults, using data from the 2011 to 2014 National Health and Nutrition Examination Survey (NHANES). Analyzing a total of 2420 participants, dietary copper intake was determined by averaging two 24-h dietary recalls, whereas cognitive function was assessed by the Digit Symbol Substitution Test (DSST), the Animal Fluency Test (AFT), a Consortium to Establish a Registry for Alzheimer's disease (CERAD) subtest and global cognition Z score. Multivariate linear regression models were used to explore the association between copper levels and cognitive function. Higher copper intake was associated with higher cognitive scores. In the fully adjusted model, compared to the lowest quartile (Q1), the highest quartile (Q4) of copper intake was associated with related to higher cognitive scores (DSST: β = 3.80, 95% CI 1.90,5.70; AFT: β = 1.23, 95% CI 0.48,1.99; CERAD-IRT: β = 0.58, 95% CI - 0.06,1.22; CERAD-DRT: β = 0.47, 95% CI 0.15,0.80; Z score: β = 0.20, 95% CI 0.10,0.29), particularly in participants with a history of stroke. Multivariate smooth spline analysis revealed that dietary copper intake was related to DSST, AFT and Z score in an inverted L-shaped nonlinear manner. The inflection point of copper was 1.63 mg/day for DSST, 1.42 mg/day for AFT and 1.22 mg/day for the Z score. Further longitudinal research is necessary to substantiate these findings.
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