Can people get more sunshine?

Sunbathing can prevent cancer and depression. "Sunshine, air, water and exercise have always been regarded as the four sources of human survival." Professor Hong Zhaoguang, a famous health education expert, told the reporter of Life Times that, first of all, sun exposure can prevent cancer. The American Association for Cancer Research also confirmed this conclusion. Hong Zhaoguang pointed out that this is because the skin can only produce vitamin D after receiving ultraviolet radiation, and vitamin D can eliminate the blood environment of tumor formation and prevent colorectal cancer and prostate cancer. Dr Giovannuz of Harvard Medical School even thinks that no nutrient can compete with vitamin D in the prevention and treatment of cancer. Secondly, sunlight can prevent the flu. John Cannel, a professor at Calderon State Hospital in Artaz, California, found that the high incidence of influenza in winter is related to less sunshine. "This will reduce the synthesis of vitamin D in the body, leading to low immunity." At the same time, the lack of sunlight makes the sterilization effect of ultraviolet light useless and gives the virus an opportunity. Third, sunlight can stimulate sperm vitality. American scientists believe that this is also the reason why women have a high probability of getting pregnant in summer. The researchers pointed out that sunlight can stimulate the sperm vitality of men, "because vitamin D may play a decisive role in the process of semen production, and lack of it may lead to infertility". In addition, Liu Baofeng, a psychiatrist of China Mental Health Association, pointed out that sunshine can also relieve people's depression. "Many people suffer from insomnia, chest tightness and irritability in winter and rainy weather. It can be said that the reduction of sunshine time is the main reason for seasonal affective disorder. In rainy weather, melatonin secretion is relatively increased, and this hormone is closely related to depression. " Babies of different ages and different sun exposure methods: morning or evening, 1 time every day, each time 15-30 minutes. He Zhixin believes that the baby's skin is delicate and easy to get sunburned, so when the sun is not strong, you should choose a place far away from direct sunlight. In Japan, when children are just full moon, parents will take their children for a walk outdoors for 20-30 minutes every day. 9-11in spring and autumn; Before 9 am in summer; Winter is around noon. After sunbathing, parents will wipe the sweat and drink water for the baby. Childhood: avoid the sun 12 noon to 4 pm. This is a critical period for the growth and development of the body, especially the development of bones, which requires a lot of vitamin D to help the body absorb calcium. Lack of vitamin d can lead to slow growth of children. Therefore, try to let children play in the sun. Young and middle-aged people: 6- 10 in the morning and 4-6 in the afternoon, get about 1-2 hours of sunshine every day. People of this age have strong metabolic ability, calcium loss is faster, and they need to supplement more vitamin D, so if conditions permit, you should try to get more sunshine. Old people: 20-30 minutes twice a day before 10 and after 4 pm. During these two periods, the ultraviolet A beam in the sun increased, which is a good time to store vitamin D in the body. The elderly receive moderate sunlight, which is helpful to prevent and treat osteoporosis and depression. However, if exposed to too strong ultraviolet radiation, it may also induce diseases such as dermatitis, cataract and senile plaque. In addition, it is best for elderly people with cataracts to wear protective glasses to prevent ultraviolet rays from directly entering their eyes. He Zhixin also reminded that there should be a "degree" in the sun. In case of skin redness, peeling or rash, stop using it.