Researchers have discovered that UV radiation brings benefits to immunity by a means other than the synthesis of vitamin D. This time, it is immune cells that are directly stimulated thanks to blue sunlight. Here are some benefits of blue sunlight.
There is no doubt that a little sunlight is good for health, since it is largely thanks to her that the body is full of vitamin D . A little UV radiation is indeed essential for the body, because it stimulates its production, which strengthens the general feeling of well-being and stimulates blood circulation.
A study by researchers could reveal another important benefit. They have discovered that sunlight energizes T cells which play a central role in immunity. Their findings suggest that this process keeps the skin on the lookout for the many microbes that may nest there.
“We all know that sunlight provides vitamin D. But what we have found is a completely separate role for sunlight on immunity,” says lead study authors . Some of the roles attributed to vitamin D on immunity can be attributed to this new mechanism. “
It is more precisely the blue light present in the rays of the sun which would have an impact on these T cells. However, although these immune T cells are present throughout the body, the skin is one of the organs which contains them. most.
“T cells have to move to do their job, which is to go to the site of infection and orchestrate a response. This study shows that sunlight directly activates these main immune cells by increasing their movement, adds experts. We know that blue light can reach the dermis, the second layer of the skin, and that these T cells can move throughout the body. “
The researchers even managed to decode how blue light increases the movement of these cells by tracing the light-activated molecular pathway: blue light leads to the synthesis of hydrogen peroxide , a compound that white blood cells release when they smell an infection and to “call” T cells for reinforcement.
“We have found that sunlight makes hydrogen peroxide appear in T cells, which makes them move. And we know that an immune response also uses hydrogen peroxide to make T cells are moving toward damage, “said expert.
Although more work is needed to find out if activating T cells with blue light has only beneficial responses, the researchers believe that this process could act as therapy to boost patient immunity .
UV radiation, and more precisely its ability to stimulate the production of vitamin D , has already made it possible to treat certain pathologies such as rickets, psoriasis, eczema and jaundice. But as the World Health Organization points out , “these treatments take place under medical supervision to ensure that the benefits they outweigh the risks they pose”, because “this therapeutic use does not can erase the negative side effects of UV. “
Natural light helps us regulate our circadian rhythm, the body’s biological clock, and improves sleep cycles. When we are regularly exposed to the sun, our body synchronizes with day / night schedules. Result: we sleep better and we are more fit during the day.
The sun stimulates our production of beta-endorphins, hormones that help us to feel good. Another way to release these hormones is to play sports. By combining sport and the sun, a smile is guaranteed.
It’s no secret: being exposed to the sun increases vitamin D intake. Various studies, reads the experts , have associated a deficiency in this vitamin with risks of diseases such as sclerosis in plaques, osteoporosis, and even the flu. Be careful not to abuse it, because too much sun limits the absorption of the vitamin.
Vision problems are often an age-related consequence. But the sun’s rays also have something to do with it and can make certain problems like cataracts worse. Only one solution: wear glasses.
A life without the sun is a life… shorter. According to experts , people who expose themselves the least to daylight lose 2.1 years of life compared to those who benefit from it daily. Experts point out, however, that finding a balance is essential, as too much sun is linked to an increased risk of skin cancer . Remember to apply sunscreen several times a day.
In small doses, the sun decreases the symptoms of acne and psoriasis. Without protection, it causes premature aging of the skin, allergic reactions, rashes, spots and increases the risk of melanoma. To protect your face and body, wear a hat, sunglasses, and don’t forget sunscreen.