Evidence map›Paper›PMID 33603001›Full record

ArticleScientific reports2021

Associations between fecal short-chain fatty acids and sleep continuity in older adults with insomnia symptoms.

Faiga Magzal, Carmel Even, Iris Haimov, Maayan Agmon, Kfir Asraf, Tamar Shochat, Snait Tamir

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
47citing papers in PubMed, 1 pooled it
7.5field-weighted citation impact, top 2% 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

47 citing papers in PubMed, 1 synthesis or guideline pooled it, 67 citations in OpenAlex.

  1. Pooled it
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  5. Review
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  9. Efavirenz-Altered Gut-Microbiota,International journal of molecular sciences · 2026
    Article
  10. Review
  11. Mechanisms Linking Insomnia and Cardiometabolic Disease Risk.Arteriosclerosis, thrombosis, and vascular biology · 2026
    Review
  12. Article
  13. 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

7 authors at 4 institutions in 1 country.

Faiga MagzalLaboratory of Human Health and Nutrition Sciences, MIGAL-Galilee Research Institute, Kiryat Shmona, Israel. faigam@migal.org.il.
Carmel EvenTel Hai College, Upper Galilee, Israel.
Iris HaimovThe Max Stern Yezreel Valley College, Emek Yezreel, Israel.
Maayan AgmonUniversity of Haifa, Haifa, Israel.
Kfir AsrafThe Max Stern Yezreel Valley College, Emek Yezreel, Israel.
Tamar Shochat *University of Haifa, Haifa, Israel.
Snait Tamir *Laboratory of Human Health and Nutrition Sciences, MIGAL-Galilee Research Institute, Kiryat Shmona, Israel.
Max Stern Academic College of Emek Yezreel · ILMigal - Galilee Technology Center · ILUniversity of Haifa · ILTel Hai Academic College · IL

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Insomnia is a disorder characterized by difficulty falling asleep and poor sleep continuity and is associated with increased risks for physical and cognitive decline. Insomnia with short sleep duration is considered the most biologically severe phenotype of the disorder. Evidence suggests that short-chain fatty acids (SCFAs), the main byproducts of fiber fermentation in the gut, may affect sleep via gut-brain communications. This study explores associations between SCFAs and sleep continuity and compares SCFA concentrations in short vs. normal sleep insomnia phenotypes in older adults. Fifty-nine participants with insomnia symptoms (≥ 65 years), completed 2 weeks of objective sleep monitoring (actigraphy), and were divided into short and normal sleep duration phenotypes via cluster analysis. Sleep measures included total sleep time (TST), sleep onset latency (SOL), sleep efficiency (SE), and wake after sleep onset (WASO). Stool samples were collected and fecal SCFA concentrations were determined by gas-chromatography-mass-spectrometry (GCMS). Higher concentrations of acetate, butyrate, and propionate, and total SCFAs, were associated with lower SE and longer SOL after controlling for Body Mass Index (BMI). Concentrations were higher in the short sleep duration phenotype. Age, BMI, TST, and SOL explained 40.7% of the variance in total SCFAs. Findings contribute to understanding pathways along the gut-brain axis and may lead to the use of SCFAs as biomarkers of insomnia phenotypes.

Indexed as

ActigraphyAgedBrain-Gut AxisFatty Acids, VolatileFecesFemaleHumansMaleSleepSleep Initiation and Maintenance DisordersFatty Acids, Volatile

Identifiers

PMID33603001
PMCPMC7893161
OpenAlexW3129675484

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.