Your gut bacteria might be influencing how you react to stress—and a stronger response could actually be a good thing. A new study from the University of Vienna found that people with higher gut microbial diversity showed stronger hormonal and subjective responses to acute stress. This may indicate a more flexible and resilient biological system.
The Research
The study, led by psychologist Thomas Karner and colleagues at the Faculty of Psychology and the Center for Microbiology and Environmental Systems Sciences (CeMESS), involved healthy participants who either underwent the Trier Social Stress Test or a stress-free control task. Researchers measured stress hormones (cortisol) in saliva and subjective stress levels, while analyzing gut microbiome composition via stool samples and estimating short-chain fatty acid production capacity.
Results showed that higher microbial diversity was linked to higher hormonal and subjective stress reactivity. Additionally, the capacity to produce specific short-chain fatty acids had opposing effects: higher estimated butyrate production was associated with stronger stress reactivity, whereas higher propionate production was linked to weaker reactivity. This suggests a complex relationship between gut metabolites and stress regulation.
Why It Matters
"A stronger acute stress response is not necessarily detrimental," Karner explained. "Appropriate activation of the stress system enables flexible adaptation to challenges and threats." These findings highlight that high-stress reactivity can be a sign of a healthy, flexible stress system rather than a weakness. They also underscore how diet and lifestyle, which shape the gut microbiome, may act as hidden "remote controls" for our daily stress responses.
What You Can Do
To support a diverse gut microbiome, incorporate fiber-rich foods like fruits, vegetables, legumes, and whole grains into your diet. Fermented foods such as yogurt, kefir, and sauerkraut also promote microbial diversity. These simple dietary shifts may help your body mount a more effective acute stress response.
Source: Neuroscience News
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