In previous discussions, we have explored simple, evidence-based interventions for battling depression including exercise (see Exercise as treatment for depression) and diet (see Dietary changes to decrease depression). This discussion will cover the benefits of spending time outside to help reduce depression.
How can spending time outside improve your mood?
There are three factors related to being outdoors and decreased rates of depression. These are sunlight exposure, increases in physical activity, and exposure to the natural environment (1).
Sunlight exposure. There is a great deal of literature indicating positive benefits of exposure to bright light (i.e., light exposure therapy LET) for depression. The benefits of light therapy as it pertains to mood are more closely linked to helping persons develop appropriate sleep-wake cycles (sleep hygiene will be covered in a future blog post) (2). It can be surmised that exposure to sunlight yields similar benefits to LET. Another benefit in exposure to sunlight is in increasing levels of vitamin D. Low levels of vitamin D is linked to depression (3). Wearing sunscreen will not impact the health benefits of sunlight exposure, so be sure to lather up!
Physical activity. Time spent outdoors is commonly associated with being active (walking, playing sports, etc.). A brief exploration of factors related to depression and exercise are explored in another blog post titled: “Exercise as treatment for depression”
As was addressed in the above-mentioned blog, physical activity is related to decreased depressive symptoms. When compared to indoor exercise, outdoor activity has increased benefits for reducing depressive symptoms (4) .
Exposure to the natural environment. Exposure to the natural environment is associated with decreased rates of depression (5). Another study found that that time spent in nature, especially around water is associated with several positive mental health effects (e.g., improved mood, decreased stress) (6). To achieve improved mental health, the minimum recommended time spent outdoors is 3 hours per week (1)
To summarize: Spending two to three hours per week outside is associated with decreased rates of depression.
So, get outside!
Be well, 😊
1. Beyer, K., Szabo, A., & Nattinger, A. (2016). Time spent outdoors, depressive symptoms, and variation by race and ethnicity. American Journal of Preventive Medicine, 51(3), 281–290.
2. Golden, R., Gaynes, B., Ekstrom, R.D., et al. (2005). The efficacy of light therapy in the treatment of mood disorders: a review and meta-analysis of the evidence. American Journal of Psychiatry, 162(4) 656-662.
3. Anglin, R., Samaan, Z. Walter, S., & McDonald, S. (2013). Vitamin D deficiency and depression in adults: systematic review and meta-analysis. British Journal of Psychiatry, 202(2) 100-107.
4. Mitchell, R. (2013). Is physical activity in natural environments better for mental health than physical activity in other environments? Social Science & Medicine, 91, 130–134.
5. Beyer, K, Kaltenbach, A., Szabo, A., Bogar, S., Nieto, F., & Malecki, K. (2014). Exposure to neighborhood green space and mental health: evidence from the Survey of the Health of Wisconsin. International Journal Environmental Research on Public Health, 11(3) 3453-3472.
6. Barton, J. & Pretty, J. (2010). What is the best dose of nature and green exercise for improving mental health? A multi-study analysis. Environmental Science and Technology, 44(10), 3947-3955.