What question did this study set out to answer?

This study aims to explore the relationship between depressive symptoms and gut health markers in IBS-D patients on a low-FODMAP diet.

May 7, 2026Open Access

Elevated Depressive Symptoms Shape Gut Barrier Integrity, LPS Translocation, and PUFA Composition in IBS-D: Evidence from a Low-FODMAP Dietary Intervention

Key Points

This study aims to explore the relationship between depressive symptoms and gut health markers in IBS-D patients on a low-FODMAP diet.
Single-arm pre-post study involving 43 IBS-D patients
Classified patients based on depressive symptom severity using the Symptom Checklist-90-Revised
Examined markers of intestinal permeability, inflammation, and PUFA composition during a 12-week low-FODMAP diet.
d+ patients had higher baseline intestinal permeability and inflammatory markers
Significant improvements in biological parameters observed post-intervention
Change in depressive symptoms did not correlate with post-intervention gut markers.

Abstract

Introduction: Alterations of the microbiota–gut–brain axis, including increased intestinal permeability (IP), changes in microbial activity, and immune activation, are central to the pathophysiology of irritable bowel syndrome with diarrhea (IBS-D). The low-fermentable oligo-di-monosaccharides and polyols (FODMAP) diet (LFD) is an established therapy for IBS, yet its systemic effects, particularly in patients with elevated depressive symptoms, remain incompletely characterized. Methods: This single-arm pre–post study investigated associations between depressive symptom severity and markers of small IP (s-IP), endotoxin exposure, inflammation, and erythrocyte membrane polyunsaturated fatty acid (PUFA) composition in 43 IBS-D patients undergoing a 12-week personalized LFD. Patients were classified using the Symptom Checklist-90-Revised depression subscale into those with (d+, n = 23) and without (d−, n = 20) clinically elevated depressive symptoms. Results: At baseline, d+ patients exhibited higher s-IP, circulating lipopolysaccharide levels, inflammatory markers, and a more pro-inflammatory PUFA profile. Following LFD, significant improvements in symptoms and several biological parameters were observed in the overall cohort. Greater absolute changes in d+ patients were consistent with their higher baseline values rather than indicating differential responsiveness. Baseline depressive symptoms were not significantly associated with the magnitude of post-intervention changes in IP or inflammatory markers. Conclusions: These findings suggest that elevated depressive symptoms identify an IBS-D subgroup characterized by greater baseline biological burden. Results should be interpreted as associative given the single-arm design, absence of a control group, and the concurrent reduction in body weight, which may have influenced the observed changes. Randomized controlled studies are needed to clarify the role of dietary interventions in modulating gut–brain axis-related pathways in IBS-D.

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Cite This Study

Prospero et al. (Tue,) studied this question.

synapsesocial.com/papers/69fbe3ca164b5133a91a31ee https://doi.org/https://doi.org/10.3390/nu18091473

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