Evidence map›Paper›PMID 35333451›Full record

SynthesisMolecular nutrition & food research2022

Dietary Flavonoids and Human Cognition: A Meta-Analysis.

Nancy Cheng, Lynne Bell, Daniel J Lamport, Claire M Williams

Open access · hybridAbstract readMeta-Analysis
In one paragraph

Synthesis in Molecular nutrition & food research, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed, 4 pooled it
19.7field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

35 citing papers in PubMed, 4 syntheses or guidelines pooled it, 69 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
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  4. Dietary Flavonoids and Human Cognition: A Meta-Analysis.Molecular nutrition & food research · 2022
    Pooled it
  5. Trial
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  8. Review
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  10. Flavonoids.Advances in nutrition (Bethesda, Md.) · 2026
    Article
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  12. Review
  13. Article
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  16. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Nancy ChengSchool of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.
Lynne BellSchool of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.
Daniel J LamportSchool of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.
Claire M WilliamsSchool of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.ORCID 0000-0003-4452-671X
University of Reading · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Improving cognition is important in all age groups, from performance in school examinations to prevention of cognitive decline in later life. Dietary polyphenols, in particular flavonoids, have been examined for their benefits to cognitive outcomes. This meta-analysis evaluates the effects of dietary flavonoids on cognition across the lifespan. In January 2020 databases were searched for randomized controlled trials investigating flavonoid effects on human cognition. Eighty studies, comprising 5519 participants, were included in the final meta-analysis. The global analysis indicates dietary flavonoids induced significant benefit to cognitive performance (g = 0.148, p < 0.001), with subgroup analyses revealing that cocoa (g = 0.224, p = 0.036), ginkgo (g = 0.187, p ≤ 0.001), and berries (g = 0.149, p = 0.009) yielded the most notable improvements. Significant benefits were observed from chronic studies, in middle-aged and older adults, and with low and medium doses. The domains of long-term memory, processing speed, and mood showed sensitivity to flavonoid intervention. This meta-analysis provides evidence for the positive effects of flavonoids on cognition and highlights several moderating factors. Flavonoid-based dietary interventions therefore potentially offer a highly accessible, safe, and cost-effective treatment to help tackle the burden of cognitive decline.

Indexed as

Cognitive DysfunctionPolyphenolsAgedCognitionFlavonoidsFruitHumansMiddle AgedFlavonoidsPolyphenolscognitioneffect sizeflavonoidmeta-analysispolyphenol

Identifiers

PMID35333451
PMCPMC9787524
OpenAlexW4220992109

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.