{
  "id": 3188469,
  "title": "Gut Microbiome Composition in Older Adults with PTSD Symptoms and Trauma-Exposed Controls: Findings from the GUMP Study",
  "url": "https://urgent.news/2026/08/24/gut-microbiome-composition-in-older-adults-with-ptsd-symptoms-and",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-08-24T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.23.746587v1?rss=1"
  },
  "original_language": "en",
  "account": "The Gut Microbiome Composition Study, conducted within the GUMP Study framework, explored the potential link between gut microbiome functionality and mental health outcomes in older adults experiencing PTSD symptoms. This pilot investigation aimed to assess associations among PTSD symptoms, dietary fibre intake, cognitive function, and gut microbiome performance in individuals aged 50 and above. Participants comprised two groups: those exhibiting PTSD symptoms and trauma-exposed controls (TEC) who had not developed PTSD. Participants completed mental health evaluations, trauma exposure assessments, and dietary fibre intake surveys. A subset of participants also provided stool samples for microbiome analysis while undergoing cognitive function assessments.\n\nThe study revealed that individuals with PTSD exhibited significantly higher mental health symptom severity and poorer performance on cognitive tasks linked to executive function, working memory, and learning. Dietary fibre consumption did not differ substantially between the PTSD and TEC groups. However, when examining functional microbiome pathways, a notable difference emerged in butyrate-producing bacterial activity (butyrate kinase abundance), with PTSD participants showing lower levels compared to their TEC counterparts. When participants were divided into groups based on dietary fibre intake, a higher butyrogenic capacity was observed in non-PTSD TEC with high fibre intake, while the PTSD fibre-stratified groups showed little difference. Importantly, the study also highlighted substantial inter-individual variation across both taxonomic and functional measures.\n\nThe findings imply that focusing on the gut microbiome's functional characteristics may offer a more nuanced understanding of PTSD-related biological processes than relying solely on taxonomic measures. Moreover, the study suggested a potential connection between dietary fibre intake and a greater butyrate-producing capacity in trauma-exposed older adults without PTSD symptoms, although this relationship appeared less pronounced in individuals with PTSD symptoms. The results support the need for further exploration of microbiome function, diet, and cognition within the context of the gut-brain axis. Researchers are encouraged to conduct larger studies incorporating metagenomic and metabolomic approaches to deepen our understanding of these complex relationships.",
  "summary": "Background: Emerging evidence suggests that alterations in the gut microbiome may contribute to mental health outcomes through the gut-brain axis. However, older adults with post-traumatic stress disorder (PTSD) remain underrepresented in microbiome research. This pilot study investigated associations between PTSD symptoms, dietary fibre intake, cognitive function, and gut microbiome functional…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}