Evidence map›Paper›PMID 40343529›Full record

ArticleEuropean journal of nutrition2025

Gut microbiota associated with equol production in school-age children.

Keiko Wada, Wataru Suda, Tomomi Ueno, Hiroaki Masuoka, Michiyo Yamakawa, Yuma Nakashima, Masaaki Sugino, Tomoka Mori, Shigeto Uchiyama, Yoshio Sumoto and 3 more

Abstract read
In one paragraph

Article in European journal of nutrition, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.

0numbers the graph read from it
0cells of the map it votes in
5citing papers in PubMed
–field-weighted citation impact
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

5 citing papers in PubMed.

  1. Review
  2. 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

13 authors.

Keiko WadaDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan. wada.keiko.z3@f.gifu-u.ac.jp.ORCID http://orcid.org/0000-0002-5467-8592
Wataru SudaLaboratory for Microbiome Sciences, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan.
Tomomi UenoSaga Nutraceuticals Research Institute, Otsuka Pharmaceutical Co., Ltd., Saga, Japan.
Hiroaki MasuokaLaboratory for Microbiome Sciences, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan.
Michiyo YamakawaDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan.
Yuma NakashimaDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan.
Masaaki SuginoDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan.
Tomoka MoriDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan.
Shigeto UchiyamaSaga Nutraceuticals Research Institute, Otsuka Pharmaceutical Co., Ltd., Saga, Japan.
Yoshio SumotoDepartment of Social Studies Education, Graduate School of Education, Gifu University, Gifu, Japan.
Yuya KiguchiDepartment of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan.
Masahira HattoriLaboratory for Microbiome Sciences, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan.
Chisato NagataDepartment of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu, 501-1194, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeLittle is known about the relationship between the human gut microbiota composition and equol-producing ability. The aim of this study is to evaluate the relationship between equol production and the gut microbiota in school-age children, with consideration of sex, age, and exposure to soy isoflavones.

methodsParticipants were 1110 students aged 7-8, 10-11 and 13-14 years. The cumulative participation rate was 85.2%. Equol production, defined as a log-transformed equol/daidzein ratio of -1.75 or greater, was determined in urine collected after two days of soymilk supplementation. Urinary daidzein, genistein, and equol were measured by liquid chromatography-mass spectrometry. The microbiota in 223 fecal samples was determined by 16S rRNA gene sequencing analysis.

resultsThe observed operational taxonomic unit number, Chao 1, and Shannon index were significantly higher in equol producers than in non-producers after adjustments for survey time, sex, and age. Principal coordinate analysis plots based on weighted and unweighted UniFrac distances showed significant differences in the gut microbiota between equol producers and non-producers. Among the species with an average abundance of ≥0.1%, several species were more abundant in equol producers than in non-producers, with significant positive correlations between relative abundances and equol/daidzein ratios. Of species previously reported as equol-producing, Asaccharobacter celatus and Slackia isoflavoniconvertens were significantly associated with equol production.

conclusionEquol production was strongly associated with the diversity of the gut microbiota. The richness of a diverse microbiota and the interrelationships among microbes may be involved in equol production.

Indexed as

EquolGastrointestinal MicrobiomeAdolescentBacteriaChildFecesFemaleGenisteinHumansIsoflavonesMaleRNA, Ribosomal, 16SSoy MilkdaidzeinEquolGenisteinIsoflavonesRNA, Ribosomal, 16SChildrenEpidemiologyEquolFood frequency questionnaireGut microbiotaIsoflavone

Identifiers

PMID40343529
PMCPMC12064588

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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.