Most people believe that the sun should always be in the winter. In fact, autumn should also be more sunbathing.
Light can be divided into visible light, infrared light, and ultraviolet light by wavelength. Sunlight is an effective natural bactericidal factor, and many bacteria easily die in direct sunlight. Dust-blown air, glass, and organic matter all reduce the bactericidal power of sunlight. Therefore, sunlight can only be used as a method of assisting disinfection. The main component of sunlight sterilization is ultraviolet light.
Ultraviolet light has the shortest wavelength compared with infrared light, but it has more benefits for the human body. Ultraviolet light can promote the growth of melanin, thicken the skin's stratum corneum, and prevent harmful substances such as germs and bacteria from invading the skin. Direct ultraviolet rays can directly kill bacteria and viruses. Scattered ultraviolet rays can weaken the activity of viruses and bacteria and inhibit their growth and development.
Sun exposure can both prevent and treat rickets. Ultraviolet light in the sun converts 7-deoxycholesterol in human skin to vitamin D. According to statistics, 1 square cm of skin is exposed to sunlight and vitamin D can produce about 20 IU in 3 hours.
In addition, ultraviolet rays act on the skin with various effects such as anti-inflammatory, anti-allergic, anti-neurological headache, and improving the nutritional status of the skin. The visible light in the sun also enhances emotional activity and boosts the spirit.
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