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Exposure of skin to ultraviolet radiation from sunlight presents both positive and negative health effects. On the positive side, UV exposure enables the synthesis of vitamin D 3, which is essential for bone health [1] and potentially plays a role in inhibiting certain cancers.
Decreased exposure of the skin to sunlight is a common cause of vitamin D deficiency. [1] People with a darker skin pigment with increased amounts of melanin may have decreased production of vitamin D. [3] Melanin absorbs ultraviolet B radiation from the sun and reduces vitamin D production. [3] Sunscreen can also reduce vitamin D production. [3]
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The periodic (daily) exposure to sunlight generally tunes the circadian rhythm to a 24-hour cycle. However, exposure to light sources that excite melanopsin in the retina during nighttime can interfere with the circadian rhythm. Harvard Health Publishing asserts that exposure to blue light at night has a strong negative effect on sleep. [17]
Another reason to protect your hair from the sun: Gray hairs are more fragile and lighter in color, making them more susceptible to sun damage than thick, dark hairs.
Dyspigmentation, the formation of wrinkles and other symptoms appear around regions of skin commonly exposed to sun, mostly the eyes, mouth and forehead. [9] The lips may be affected. [9] In Canadian women, the upper chest is commonly affected. [9] Spider veins on face and neck; Loss of color and fullness in lips
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