Frontiers in nutritionSep 16, 2026

The gut-brain connection as a treatment target in alcohol use disorder: how fiber, gut lining health, and brain inflammation relate to depression

Gut-Brain Axis Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Sep 17, 2026

Abstract

Chronic alcohol consumption may disrupt the gut-brain axis by damaging intestinal tight junctions and inducing gut dysbiosis.

Depletion of short-chain fatty acid-producing bacteria is associated with gut dysbiosis resulting from alcohol use.
Impairment of intestinal barrier integrity may allow bacterial components to enter circulation, promoting neuroinflammation.
Neuroinflammatory changes could persist during abstinence, potentially leading to dysregulation of neurotransmitter systems linked to depression.
Intestinal barrier dysfunction may connect alcohol-induced gut dysbiosis with neuroinflammation and increased vulnerability to relapse.
Dietary fiber supplementation is proposed as a potential strategy to enhance gut health and reduce neuroinflammatory signaling.

Simplified

Alcohol use disorder is frequently accompanied by major depressive disorder, yet the biological mechanisms linking both conditions remain incompletely understood. Increasing evidence suggests that chronic alcohol consumption disrupts the gut-brain axis by damaging intestinal tight junctions and inducing gut dysbiosis characterized by depletion of short-chain fatty acid-producing bacteria. The resulting impairment of intestinal barrier integrity may facilitate the translocation of bacterial lipopolysaccharide, promoting peripheral and central neuroinflammation through Toll-like receptor 4-dependent pathways. These neuroinflammatory alterations may persist during abstinence and contribute to glutamatergic, dopaminergic, and serotonergic dysregulation associated with depressive symptoms and relapse vulnerability. This Perspective proposes that intestinal barrier dysfunction represents an actionable upstream mechanism linking alcohol-induced gut dysbiosis with neuroinflammation, depression, and relapse vulnerability, and highlights dietary fiber supplementation as a physiologically grounded, accessible nutritional strategy to enhance endogenous butyrate production, improve intestinal barrier integrity, and attenuate neuroinflammatory signaling. Available preclinical and clinical evidence is critically evaluated, and key priorities for future mechanistic and clinical studies are outlined.

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The gut-brain connection as a treatment target in alcohol use disorder: how fiber, gut lining health, and brain inflammation relate to depression

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