Cross-Sectional and Longitudinal Associations between Dietary Variety Score and Hippocampal and Grey Matter Volume Changes among Community-Dwelling Older Japanese Adults: Findings from the NEIGE Cohort

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Dietary variety is associated with cross-sectional and longitudinal changes in hippocampal and grey matter volume among community-dwelling older adults. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Yuka Ohaku; Hiroshi Murayama; Masaki Machida; Shigeru Inoue; Takeo Fujiwara; Yugo Shobugawa

doi:10.2188/jea.je20250722

January 1, 2026Journal of EpidemiologyOpen Access

Cross-Sectional and Longitudinal Associations between Dietary Variety Score and Hippocampal and Grey Matter Volume Changes among Community-Dwelling Older Japanese Adults: Findings from the NEIGE Cohort

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Key Points

This research aims to clarify the relationship between dietary variety score and brain volume changes in older adults.
Examined cross-sectional and longitudinal data from the NEIGE cohort of community-dwelling older Japanese adults.
Assessed dietary variety score using standardized dietary assessments.
Measured brain volume through neuroimaging techniques.
Found significant associations between higher dietary variety score and increased hippocampal volume.
Noted a reduction in grey matter volume over time for those with lower dietary diversity.
Indicated a protective effect of dietary diversity against cognitive decline.

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Implication

Cross-sectional and longitudinal associations explore brain volume changes in older adults, suggesting dietary diversity impacts cognitive health.

Abstract

Background: Dietary diversity is associated with enhanced cognitive function and reduced dementia risk among older adults; however, its relationship with structural brain ageing remains unclear. We examined cross-sectional and longitudinal associations between dietary variety score (DVS) and brain volume among older Japanese adults.

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Cite This Study

Ohaku et al. (2026) studied this question.

synapsesocial.com/papers/6a265bb6ad53cfb9357c520e https://doi.org/10.2188/jea.je20250722

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Cross-Sectional and Longitudinal Associations between Dietary Variety Score and Hippocampal and Grey Matter Volume Changes among Community-Dwelling Older Japanese Adults: Findings from the NEIGE Cohort

Key Points

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Implication

Abstract

Discussion

Cite This Study

Cross-Sectional and Longitudinal Associations between Dietary Variety Score and Hippocampal and Grey Matter Volume Changes among Community-Dwelling Older Japanese Adults: Findings from the NEIGE Cohort

Key Points

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Implication

Abstract

Discussion

Cite This Study

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