As we know, the sun is the main source for solar energy. But it is also responsible for release of vitamin D. Sun rays can be divided into UV A and UV B. While UV A rays cause aging, UV B rays burn your skin. However, both are essential for bone health.
They influence cardiovascular disease and some cancers. Geographies located above 42 degrees north latitude are lack of UV B in sunlight. 16% of the U.K people are severely lacked of Vitamin D. 6% of the US residents are suffered from Vitamin D deficiency.
10 minutes of sun exposure is needed in the summer. While 20 minutes of exposure required during spring season, 30 minutes of sunshine is necessitated in the winter.