Sunbathing for at least half an hour every day. Most people know that sunbathing can promote the absorption of calcium, but few people can tell the reason. In fact, the most important factor affecting the absorption of calcium by human body is the metabolite of active vitamin D. Vitamin D can be obtained mainly through two ways, one is from food, and the other is that vitamin D3 is synthesized after ultraviolet rays in the sun irradiate human skin, which can promote the absorption of calcium by small intestine and even colon. If the human body lacks vitamin D, the absorption rate of calcium is only10%; If the body contains enough vitamin D, the absorption rate of calcium will increase to 60%-75%. Vitamin D is also called "sunshine vitamin". The source of vitamin D3 contained in human skin is made by obtaining ultraviolet rays from sunlight and converted into vitamin D, which can help the human body absorb calcium and phosphorus. A person who can't see the sun all day will have a much higher incidence of osteoporosis than the normal population. Sunlight can speed up metabolism. Sunlight irradiation can promote blood circulation of human skin, accelerate skin metabolism and regulate human immune function. Patients with silver filings and rheumatoid arthritis get more sunshine, which will have a good adjuvant treatment effect. Sunlight can also promote the production of melanin in the skin and enhance the skin's resistance to ultraviolet rays. Therefore, to some extent, the skin is an important organ that affects the calcium absorption of human body. Therefore, basking in the sun is good for your health. B sunshine can also make people feel good. Sunlight exposure can change the content of some signal substances in the human brain, which makes people feel high and willing to engage in challenging activities. Sunbathing for half an hour in the morning is especially effective for those who are listless and prone to depression, and sunbathing also has a certain effect on treating seasonal emotional disorders. C sunbathing should also pay attention to the time period. Sunbathing should also pay attention to scientific selection of time periods. According to scientific research, Wan Li is clear, so it is best not to bask in the sun at noon. It is more suitable when the sky is a little cloudy. If you think the sun stings or burns your skin, you should hide in the shade. The best sunbathing time is from 8: 00 am to 10, and from 4: 00 pm to 7: 00 pm. Sunbathing through the glass has no fitness effect. Some white-collar workers feel that their seats are near the window and they can enjoy the sunshine when they go to work every day. In fact, this is not the case. Sunbathing through the glass window is not effective. It is best to choose outdoor or spacious balcony. It is best to wear red clothes when basking in the sun, because the long-wave radiation of red clothes can quickly "eat" the short-wave ultraviolet rays with strong lethality. At the same time, try to expose the skin and let the sun get in close contact with the skin. Hehe, this is what I know, but it is not necessarily comprehensive. Please refer to.