Prebiotics as an adjunct therapy for posttraumatic stress disorder: a pilot randomized controlled trial

Area of Science:

• Neuroscience
• Microbiome research
• Psychiatry

Background:

• Posttraumatic stress disorder (PTSD) is a mental health condition often accompanied by gastrointestinal issues.
• Current treatments like cognitive behavioral therapy (CBT) are effective but not universally successful.
• Disruptions in the gut microbiome (dysbiosis) in PTSD patients may contribute to neuroinflammation, suggesting microbiome modulation as a therapeutic target.

Purpose of the Study:

• To assess the impact of a prebiotic fiber intervention combined with CBT on PTSD clinical outcomes in veterans.
• To explore the relationship between PTSD symptom severity, gut microbiota composition, and short-chain fatty acid (SCFA) levels.
• To evaluate the feasibility and acceptability of using prebiotic supplementation as an adjunct to CBT for PTSD.

Main Methods:

• A 12-week, double-blind, placebo-controlled trial involving 70 veterans with PTSD.
• Participants received either CBT with prebiotic fiber or CBT with placebo.
• Assessed PTSD symptom severity, gut microbiota composition, and SCFA levels (acetate, propionate, butyrate) at baseline and end of treatment.

Main Results:

• PTSD severity was potentially associated with a lower abundance of bacteria producing the SCFA propionate.
• A subset of veterans with PTSD showed clinical improvement with the microbiota-modifying prebiotic intervention.
• The prebiotic intervention was found to be feasible and acceptable as an adjunct to CBT.

Conclusions:

• Targeting the intestinal microbiome with prebiotic supplementation shows promise for enhancing PTSD treatment outcomes.
• Microbiota modulation may serve as a valuable adjunct or alternative therapeutic strategy for specific individuals with PTSD.
• Further research is warranted to elucidate the mechanisms underlying the gut-brain axis in PTSD.