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the claim
Dietary fiber intake and gut transit time determine stool volume differences.
the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against
Is it true that dietary fiber intake and gut transit time determine stool volume differences?
Yes. Robust clinical evidence from recent systematic reviews and meta-analyses demonstrates that dietary fiber intake directly influences gut transit time and increases stool volume.
Verdict: SUPPORTED · 2 sources for, 0 against · Last checked
The analysis
Multiple large-scale systematic reviews and meta-analyses of randomized controlled trials (such as papers [3] and [5]) provide consistent, moderate-certainty evidence that dietary fiber intake significantly increases fecal weight and modulates gut transit time. No papers contradict the general physiological link between fiber and stool output characteristics.
Evidence for · 2
Comprehensive systematic review and meta-regression models provide moderate certainty evidence that increasing dietary fiber intake significantly increases total fecal weight and shortens gut transit times.
Get citation
EM, B., E, C., HJ, M., Y, C., GP, A., G, K., EL, C., TA, T., G, W., K, D., NJ, T., & AH, L. (2026). Fiber intake and laxation in people with normal bowel function: a systematic review.. doi.org. https://doi.org/10.1016/j.ajcnut.2026.101212
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More for · 1
Systematic review of randomized controlled trials shows that dietary fiber intake reliably impacts laxation outcomes, including fecal weight, stool consistency, and gut transit time.
Get citation
Balk, E. M., Couch, E., Mai, H. J., Chen, Y., Adam, G., Kanaan, G., Caputo, E., Trikalinos, T., Williams, G., Duncanson, K., Talley, N., & Lichtenstein, A. H. (2025). Fiber Intake and Laxation in People With Normal Bowel Function. doi.org. https://doi.org/10.23970/ahrqepcsrlaxation
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Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 7704 Aug 2026
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