Trial reportEuropean journal of clinical nutrition2025
Effect of dietary fiber on trimethylamine-N-oxide production after beef consumption and on gut microbiota: MEATMARK - a randomized cross-over study.
Trial report in European journal of clinical nutrition, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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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.
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.
Who cites it
6 citing papers in PubMed.
- Gut Microbiota as an Innovative Therapeutic Target in Cardiovascular Diseases from a Metabolic and Inflammatory Perspective.Biomedicines · 2026Review
- Gut Microbial Choline TMA-Lyase CutC: From Metabolic Mechanism to a Novel Therapeutic Target for Diseases.Nutrients · 2026Review
- [Mechanisms of gutZhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences · 2026Review
- Dietary Nutrients, Gut Microbiota, and Cardiac Function: From Metabolic Mechanisms to Clinical Applications.Nutrients · 2026Review
- Interplay Among Gut Microbiota-Derived TMAO, Autonomic Nervous System Dysfunction, and Heart Failure Progression.International journal of molecular sciences · 2025Review
- A Systemic Perspective of the Link Between Microbiota and Cardiac Health: A Literature Review.Life (Basel, Switzerland) · 2025Review
Corrections and comments
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND/
objectivesThe gut-microbiota-dependent metabolite trimethylamine-N-oxide (TMAO) has been linked to cardiovascular disease (CVD) risk, while dietary fiber is associated with reduced CVD risk and improved gut health. Considering these associations, we conducted a randomized, double-blind, pilot study to investigate the influence of fiber supplementation on intestinal TMAO formation after beef consumption. SUBJECTS/
methods13 volunteers underwent a two-week dietary fiber and placebo intervention. We assessed the effect of fiber supplementation on the gut microbiota and gene abundance of the enzyme cutC, a key enzyme for microbial TMA formation, a precursor for TMAO. We measured the TMAO response following beef consumption after the two-week intervention. We also examined the role of hepatic enzyme FMO3 on TMAO plasma levels.
resultsAlthough overall TMAO production did not change between the dietary fiber and placebo group (p-value = 0.26, 95% CI), subgroup analysis revealed that fiber supplementation attenuated TMAO formation following beef intake in participants with lower habitual meat consumption ( <3 times/week, p-value = 0.029, 95% CI). Furthermore, fiber intervention significantly downregulated microbial cutC gene abundance (p = 0.034, 95% CI), suggesting a mechanism by which fiber might reduce plasma TMAO levels. While dietary fiber intervention did not alter TMAO production across all participants, it showed a potential effect in individuals with lower habitual meat intake. The observed downregulation of cutC gene abundance suggests a mechanism for the beneficial impact of fiber on TMAO formation.
conclusionThese findings support the role of a high-fiber, low-meat diet as a promising strategy to mitigate TMAO-related CVD risk. Graphical abstract of the MEATMARK study. Created with BioRender.com. Haas, M. (2025) https://BioRender.com/x12v771 .
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