Dietary quality may enhance survival related to cognitive impairment in Taiwanese elderly

Rosalind Chia Yu Chen, Yu Hung Chang, Meei-Shyuan Lee, Mark L. Wahlqvist

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    Abstract

    Background: Impaired cognition increases mortality in the aged. It is unclear how dietary quality might affect this relationship. Objective: To examine how dietary diversity and cognition might interact to determine survival. Design: In a Nutrition and Health Survey in Taiwan (NAHSIT 1999-2000), 1,839 representative elderly were followed for mortality up to 10 years. The dietary quality measure was a dietary diversity score (DDS, range: 0-6) to present six food groups (dairy, meat, rice and grains, fruit, vegetable,fat and oil) derived from a 24-h dietary recall. Cognitive function was evaluated by the validated Short Portable Mental Status Questionnaire (SPMSQ). Results: Those with cognitive impairment (SPMSQ ≥3 errors) had 2.56 (95% confidence intervals (CI), 1.99- 3.28) times the all-cause-mortality risk of those with intact cognition. After control for potential confounders, the adjusted hazard ratio (HR) remained significant (1.46, 95% CI: 1.06-2.02). Significant interactions for DDS and cognition were found (p<0.001). Jointly, compared to normal-SPMSQ-highest DDS, the greatest HR is where impaired cognition is combined with the lowest DDS (HR 2.24, 95% CI: 1.19-4.24). Increased DDS was associated with improvement in survival that is especially evident in those with 1-2 errors where the greatest HR reduction was found, and for fruit. Attributability for mortality amounted to 18% for impaired cognition and 33% for least diverse diet. Conclusions: Dietary diversity may improve survival in relation to impaired cognitive function.

    Original languageEnglish
    Article number7387
    Pages (from-to)1-10
    Number of pages10
    JournalFood & Nutrition Research
    Volume55
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Cognition
    • Dietary diversity
    • Elderly
    • Fruit
    • Mortality

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