Benefits:
The benefits of sunbathing are manifold. Sunbathing on sunny days in cold season can not only make people feel warm, promote blood circulation and metabolism, but also enhance the absorption of calcium and phosphorus, which is beneficial to the recovery of patients with rickets, rheumatoid arthritis and anemia, especially the prevention of rickets in infants.
Ultraviolet rays in the sun have a strong bactericidal ability. Generally, bacteria and some viruses will be killed if they are exposed to the sun for half an hour or several hours. For example, Mycobacterium tuberculosis can survive for several months in a dark and humid environment, but only for a few hours in the sun. In addition, ultraviolet rays can also convert dehydrocholesterol in the human body into vitamin D, which promotes bone calcification and growth, so sunlight also directly affects people's height.
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Disadvantages:
Excessive ultraviolet radiation can make people slow down and induce skin and lung diseases. The reason why "sunbathing", which was popular in the West in 1970s and 1980s, failed to continue to be popular all over the world is that when sunbathing, the skin was exposed for a long time, which damaged the skin tissue and had a negative impact on health. Summer season is not suitable for exposure, even in winter, the sun is not as much as possible. You should choose the "prime time" before 10 in the morning and after 3 pm, and it is advisable to stick to the sun for 30~60 minutes every day. For the elderly and infirm, it is best to choose half an hour after sunrise as the start time of sunbathing. At this time, the air is moist and fresh, and the sun is warm and soft. Therefore, it is best to grasp a certain degree of sunshine.