Effects of seafood consumption and toenail mercury and selenium levels on cognitive function among American adults: 25 y of follow up

Xuanxia Mao, Cheng Chen, Pengcheng Xun, Martha Daviglus, Lyn M. Steffen, David R. Jacobs, Linda Van Horn, Stephen Sidney, Na Zhu, Ka He

Research output: Contribution to journalArticle

Abstract

Objectives: The aim of this study was to examine the longitudinal association between seafood and intake of long-chain ω-3 polyunsaturated fatty acids (LCω-3 PUFA) and cognitive function and to explore the possible effect modifications owing to mercury (Hg) and selenium (Se) levels. Methods: Participants (N = 3231) from the CARDIA (Coronary Artery Risk Development in Young Adults) study underwent baseline examination and were reexamined in eight follow-up visits. Diet was assessed at baseline and in exam years 7 and 20. Toenail Hg and Se were measured at exam year 2. Cognitive function was measured at exam year 25 using three tests: Rey Auditory Verbal Learning Test (RAVLT), Digit Symbol Substitution Test (DSST), and the Stroop test. The general linear regression model was used to examine cumulative average intakes of LCω-3 PUFA and seafood in relation to the cognitive test scores; and to explore the possible effect modifications caused by Hg and Se. Results: LCω-3 PUFA intake was significantly associated with better performance in the DSST test (quintile 5 versus quintile 1; mean difference = 1.74; 95% confidence interval, 0.19–3.29; P trend , 0.048]), but not in the RAVLT and Stroop tests. Similar results were observed for intakes of eicosapentaenoic acid, docosahexaenoic acid, and non-fried seafood. The observed associations were more pronounced in participants with body mass index ≥25 kg/m 2 , but not significantly modified by toenail Hg or Se. Conclusion: This longitudinal study supported the hypothesis that LCω-3 PUFA or non-fried seafood intake is associated with better cognitive performance in psychomotor speed among US adults, especially those who are overweight or obese.

Original languageEnglish (US)
Pages (from-to)77-83
Number of pages7
JournalNutrition
Volume61
DOIs
StatePublished - May 2019

Keywords

  • Cognitive function
  • Hg
  • LCω-3 PUFA
  • Se
  • Seafood consumption

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, N.I.H., Intramural

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