Alterations in the intestinal microbiome and mental health status of workers in an underground tunnel environmentOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers examined whether working in an underground tunnel environment alters the gut microbiome and mental health of tunnel workers. The study followed 48 healthy male workers, aged 19 to 43, in northwest China.
How was it studied?
Fecal samples were collected before workers entered the tunnel (baseline status) and again after they left, three weeks later (exposed status). Samples underwent 16S rRNA sequencing, and workers completed a self-evaluation mental health questionnaire.
What did they find?
Shannon and Simpson diversity indices both fell significantly from baseline to exposed status. Actinobacteria, Bifidobacterium, Romboutsia, and Clostridium sensu stricto rose, while Faecalibacterium and Roseburia declined. In the questionnaire, 61.3 percent of workers reported appetite loss, 54 percent reported headache or dizziness, and about half reported irritability after the tunnel period.
Why it matters
The pattern of microbiome shifts resembled changes reported in patients with mood disorders, including reduced Faecalibacterium, a short-chain-fatty-acid producer linked to anti-inflammatory activity. The authors suggest gut microbiome changes may be relevant to the mental distress symptoms seen in underground-tunnel workers.