Mood (psychology)
Environment

Nature can also have a positive effect on mood. Studies have shown that exposure to natural environments increases positive affect and decreases negative affect, meaning that one's mood is often better when in a nature setting. An example of this is how direct exposure to sunlight has been proven to improve mood and has been used to treat symptoms of depression. Further, walking outdoors as opposed to walking indoors made individuals much happier, which additionally illustrates that nature has a positive effect on our mood. While nature often improves our mood, it can worsen it as well. There is a common mood disorder called Seasonal Affective Disorder (SAD) that often occurs during the winter months when there is less daylight and it is colder outside. SAD is characterized by depressed mood, increased appetite, and increased sleep. This displays how an individual's mood can be negatively affected by nature as well. Studies have also shown that depending on the season, temperature can regulate mood.
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