The earth is the most beautiful planet in the solar system. It has an atmosphere about 1000 km thick, just like the earth's coat, protecting the earth from excessive solar radiation and cosmic rays. It turns the "cosmic tramp" who dares to compete with the earth into a beam of light, a meteor or a meteorite, and avoids the collision between the earth and unexpected guests such as asteroids again and again. The atmosphere can also adjust the heat that the sun shines on the earth. It is this protective layer that creates a suitable living environment for life on earth.
For human beings, strong ultraviolet rays and solar storms will have a certain impact on human health. For example, too strong solar radiation is harmful to human health, and strong ultraviolet rays may burn the skin and induce immune system diseases such as skin cancer, but this effect is far less serious than the familiar cold wave, tropical storm and air pollution. What's more, according to experts' research, the incidence of skin cancer is related to race, and the incidence of yellow people and blacks is lower, about110-1/5 of whites.
Regular sun exposure is good for health. Regardless of spring, summer, autumn and winter, I suggest you go out and get in touch with the sun, as long as you avoid the scorching sun at noon and summer. Ultraviolet rays in the sun can kill bacteria in the air, and many molds can't survive in the sun; Ultraviolet rays can also kill bacteria on the skin, increase the elasticity and softness of the skin, and resist foreign bacteria. More sun exposure will make your skin dark and red, healthier and less prone to sores, acne and skin diseases. Sunlight on the skin can stimulate the hematopoietic function of the body, promote the metabolism of calcium and phosphorus in the body and the synthesis of vitamin D, and make your bones and body stronger; The infrared rays in sunlight can penetrate the skin and reach the subcutaneous tissue, which can stimulate the human body, speed up blood circulation, promote metabolism in the body, and have anti-inflammatory and analgesic effects. When there is a lack of sunshine, the brain will produce a kind of worry hormone, which makes people feel sleepy and depressed. Sunlight is the best stimulant, which can adjust people's mood, cheer up their spirits, relieve melancholy symptoms, improve life interest and work efficiency, and improve various physiological functions of the human body.
In short, sunshine has many benefits to human body, but choose sunny weather and be careful not to overexpose to avoid damaging skin and eyes; It is also not advisable to sunbathe on an empty stomach, full stomach and fatigue to avoid dizziness; Patients with severe heart disease, hypertension and nervousness, people who are allergic to sunlight, and women during menstruation and one month after delivery should be careful not to be overexposed to avoid accidents.
Chinese traditional medical theory attaches great importance to the effect of sunlight on human health, and holds that regular exposure to the sun is helpful to promote human yang, and can achieve the functions of strengthening yang, warming meridians and dredging collaterals.
Modern scientific research shows that there are mainly ultraviolet rays, infrared rays and visible light in sunlight. Among them, ultraviolet rays have the greatest influence on human body. Although this kind of light can't be seen by naked eyes, it can make the skin healthy, stimulate the body's hematopoietic skills, improve the body's immune ability, improve the body's glucose metabolism, promote the body's calcium and phosphorus metabolism and vitamin D synthesis, effectively prevent rickets or rickets, and also promote blood circulation, stimulate appetite and enhance physical fitness.
Infrared is also a kind of invisible light, accounting for 60%~70% of sunlight. It can penetrate into subcutaneous tissue through the skin and stimulate the human body, thus dilating blood vessels, accelerating blood circulation, promoting metabolism in the body, and playing the role of diminishing inflammation and relieving pain.
Visible light is sunlight that the eyes can see. It consists of seven colors: red, orange, yellow, green, cyan, blue and purple. It can adjust people's mood, cheer up their spirits, improve people's life fun and work efficiency, and improve various physiological functions of the human body.
Sunlight helps you to supplement vitamin D.
Most of the health benefits of sunlight are related to its ability to increase the content of vitamin D in the body.
Vitamin d controls the regeneration of human cells,
And can help the human body absorb nutrients beneficial to bones and teeth.
As long as you get enough sunlight every day, you can meet 90% of your vitamin D needs.
The remaining 10% needs to be obtained from the daily diet.
Foods rich in vitamin D include fish, fish eggs, liver, egg yolk, cream, butter, cheese,
Meat, milk, fruits, nuts, vegetables and grains.
But it should be noted that if you don't accept sunlight,
Food alone cannot guarantee the demand for vitamin D.
Six health plus points
Is sunshine really so beneficial to health? Let's elaborate on it in detail.
Promote bone and tooth health
Long-term avoidance of sunlight can easily lead to calcium deficiency. Ultraviolet rays in the sun can increase vitamin D in our body, which is very important for the health of bones. Vitamin d can improve the absorption of calcium and phosphorus in human body, and make the plasma calcium and phosphorus levels reach saturation level; It promotes bone growth and calcification and helps to keep teeth healthy.
If you receive too little sunlight, your body will lack vitamin D, so rickets, hand and foot convulsions, rickets and osteoporosis may all get you into trouble.
Make your skin healthier.
If you love beauty, you are always afraid of being tanned or even sunburned, so you avoid the sun. In fact, sunshine is of great benefit to the health of the skin! It can enhance skin resistance, kill bacteria on skin, enhance skin elasticity, luster and softness, and make skin more perfect. The latest scientific research shows that sunlight can also prevent several kinds of skin cancers.
improve immunity
Ultraviolet rays in sunlight can stimulate cholesterol in human skin to be converted into vitamin D. Don't underestimate this very common vitamin. As long as 0.009 mg per day can improve your immunity 1 times.
Not only that, sunlight can also increase oxygen and white blood cells in the blood, so experts believe that sunbathing can improve people's immunity. Studies have shown that regular sunbathing can prevent colds and many infectious diseases.
cancer prevention
The latest medical research shows that sunlight can prevent the growth of some cancer cells, including several kinds of skin cancer, lymphatic adenocarcinoma and breast cancer. Fully accepting sunlight can increase vitamin D in your body, which scientists believe is the reason for the decrease of cancer incidence.
Scientists in Sweden and Denmark have found that ultraviolet rays in sunlight can reduce the risk of lymphoma by 30%~40%. A study by the University of New Mexico found that exposure to sunlight reduced the mortality rate of patients with malignant melanoma.
In addition, people who live in sunny environment will have a much lower risk of breast cancer. Some surveys show that people who live in sunny environment.
Give you a good mood
You must feel that on a sunny day, your mood has become cheerful and your work efficiency seems to have improved. This is because sunlight can stimulate the brain to release a large number of chemicals that can produce pleasure, regulate emotions, make people refreshed, feel comfortable, and become positive and energetic.
Improve sexual interest
Sunlight can also raise the level of sex hormones and make your sex life more like a duck to water. In fact, the influence of Yangguan on hormone level is remarkable, and it is even used to treat menopausal syndrome.
In addition, sunlight can prevent multiple sclerosis and rheumatoid arthritis.
Sunbathing is skillful.
Although sunbathing is of great benefit to health, exposure to the sun without protection, regardless of time and intensity, may harm the skin and even cause physical discomfort or skin cancer. Therefore, there must be surgery in the sun!
Sunbathing time
Compared with summer, autumn, winter and spring are mild sunshine seasons. Depending on the intensity of light, you can sunbathe for 5 to 30 minutes. It should be noted that the sun's ultraviolet rays are strongest between 1 1 and 3 pm every morning. It is best to avoid this time when sunbathing to avoid sunburn.
Sunbathing posture
Expose your skin as much as possible and receive sunlight. You can choose the riverside, lakeside or beach bath in the suburbs, or lie or sit, or do it during activities. Pay attention to changing the position at any time to avoid uneven illumination.
sun-proof
When sunbathing, you should pay special attention not to overexpose, so as to avoid skin aging and even skin cancer caused by excessive ultraviolet radiation. When sunbathing, you should also pay attention to protecting your head and eyes to avoid dizziness and fatigue caused by excessive exposure.
Sunscreen is also essential when sunbathing. UVA (98.9% of ultraviolet rays) will tan your skin, and UVB (only 1. 1% of the total) will make your skin sunburned and red. Sunscreen can help you block most UVA and UVB and protect your skin. But don't think that wearing sunscreen is absolutely safe. Overexposure can still hurt the skin.
Four situations are not suitable for sunbathing.
Suffering from severe heart disease, high blood pressure,
Patients with infiltrative tuberculosis and neurosis;
Those with bleeding tendency;
Women during menstruation and within one month after delivery;
When you are hungry, holding your stomach and tired;
People who are allergic to sunlight.