Are There Benefits to Spending Time Outdoors?
Spending time outdoors can improve overall health and wellness. The outdoors offers many opportunities to be physically active. Time outdoors may also promote mental health and stress reduction. While enjoying the benefits of being outdoors, people can decrease skin cancer risk from too much UV exposure by using sun protection. Protect yourself by staying in the shade, wearing protective clothing, and applying and re-applying a broad spectrum sunscreen with a sun protection factor (SPF) of 15 or higher.
Ultraviolet (UV) rays from the sun can stimulate production of vitamin D in the skin. Having little or no sun exposure may put a person at risk for low levels of vitamin D, but too much UV exposure from the sun or artificial sources can increase risk of skin cancers and eye disease. CDC data [PDF-316KB] show that most people in the United States are getting enough vitamin D. The amount of vitamin D a person’s skin makes when they are in the sun depends on many factors, including skin tone, geographic location, weather conditions, time of year, and time of day.
You can find food sources of vitamin D that include some types of fish; foods with added vitamin D, such as some cereals; juices; dairy products; and egg yolks.
The skin can produce only a limited amount of vitamin D at one time. Once the body has reached this limit, spending more time in the sun will not continue to increase vitamin D levels. However, continued time in the sun will increase your skin cancer risk. There is no known level of UV exposure that would increase vitamin D levels without also increasing skin cancer risk. Vitamin D can be obtained safely through food and dietary supplements without the risks associated with overexposure to UV.
Additional resources about physical activity—
- CDC: Physical activity basics: how much physical activity do you need?
- CDC: Physical activity data and statistics
- CDC: Physical activity facts
Additional resources about vitamin D—
- National Institutes of Health Vitamin D Fact Sheet for Health Professionals
- MedlinePlus: Vitamin D
- National Cancer Institute: Vitamin D and Cancer Prevention