Large-Scale Meta-Analysis Finds Nature-Based Interventions Reduce Anxiety and Depression Symptoms A second-order meta-analysis published May 28, 2026, in Nature Human Behaviour examined 116 systematic reviews covering more than 10 million participants. Researchers from Islamic Azad University in Iran reported that nature-based interventions (NBIs) were associated with significant reductions in negative outcomes such as anxiety, depression, heart rate, and negative affect. NBIs also showed enhancements in positive outcomes including positive affect and relaxation, according to the study. The analysis consolidates findings from more than three decades of research on the mental health effects of exposure to natural environments, which has increasingly…

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