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Fiber for fecal leakage: psyllium and other fibers behaved differently

One trial found fewer leakage episodes with psyllium, while carboxymethylcellulose increased them. Fiber type mattered.

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Supplement Science Insights Editorial Team

Published September 23, 2026

The study and its comparison

A randomized trial compared psyllium, gum arabic, carboxymethylcellulose and placebo in adults with loose or liquid fecal incontinence. The intention-to-treat analysis included 206 participants; 189 completed both data-collection periods. [1]

After the supplementation period, estimated weekly episodes were lower with psyllium than placebo. Carboxymethylcellulose had the opposite direction, and quality-of-life scores did not differ among groups. [1]

What the finding establishes

These findings concern a specific leakage problem, not every cause of diarrhea or constipation. A shared fiber label does not make the preparations interchangeable. NIH nursing-research funding supported the trial; Kimberly Clark supplied absorbent products. Other conflicts were not established from the retrieved text. [1]

A hypothetical distinction

Imagine two fibers retain different properties in stool. Counting fiber grams alone can conceal different clinical effects.

Interpretation checklist — Fiber for fecal leakage
DetailInterpretation
Measured outcomeKeep the endpoint specific
Study preparationNot every retail product
Remaining uncertaintyNot resolved by a mechanism
Fiber for fecal leakage: psyllium and other fibers behaved differently — original article outline diagram
Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

Sources for this article

  1. Dietary Fiber Supplementation for Fecal Incontinence: A Randomized Clinical Trial - PMC
    Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.