- Beneficial microorganisms: Soil contains naturally occurring bacteria, including Mycobacterium vaccae and Streptomyces rimosus. Research suggests that certain soil microorganisms may influence the gut–brain axis or activate neural pathways associated with serotonin regulation and relaxation.
- Reduced cortisol levels: Physical activities such as gardening and working with soil may reduce cortisol, the primary stress hormone. Some research suggests that gardening can promote greater reductions in cortisol than certain indoor leisure activities.
- Sensory experience and connection with the natural environment: The characteristic scent of soil arises partly from volatile organic compounds such as geosmin. Exposure to these compounds may influence brain-wave activity and contribute to a sense of calm, although these effects require further investigation.
- Mindfulness and focused attention: Digging, planting, and tending plants provide tactile experiences that encourage present-moment awareness. These activities can redirect attention away from everyday concerns while fostering a sense of accomplishment.
Veterans Project publishes general education. Nothing here is medical advice, a diagnosis, or a recommendation to start or stop any treatment, and nothing here replaces your own doctor, who knows your history and can examine you.
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