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Integrate relevant data into this article on the positive effects of nature on mental health.

"Spending time in nature can reduce symptoms of depression and anxiety, improve mood, and increase a sense of wellbeing."
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A study by Stanford University found that spending just 90 minutes in nature can lead to a reduction in negative thought patterns and lower levels of anxiety, while another study by the University of Essex found that green exercise can lead to improved self-esteem and mood.