Why does ultraviolet light accelerate aging? Why does ultraviolet light make the skin darker?

Ultraviolet rays exist every day and are unavoidable. If you don't take some preventive measures for a long time, your skin will be damaged. So why does ultraviolet rays accelerate aging? Why does ultraviolet rays make your skin darker?

The damage of ultraviolet rays to the skin may seem small, but if exposed for a long time, its impact will definitely exceed your imagination. When middle-aged women are doing outdoor activities, if the sun is strong, they must take good sun protection. Excessive ultraviolet rays will cause serious oxidative damage to the skin, and will accelerate the deposition of melanin on the surface of the skin, produce color blocks and spots, accelerate the formation of wrinkles, and make the skin enter aging. In addition to sunlight, middle-aged women should also be careful not to be exposed to ultraviolet light for a long time.

Because the radiation of long-wave ultraviolet rays (UVA) and medium-wave ultraviolet rays (UVB) in sunlight has a proliferation and activation effect on melanocytes in the human epidermis. The density of melanocytes in the exposed epidermis is twice that of the non-exposed parts. At the same time, ultraviolet rays enhance the dopamine response of melanocytes, making the skin in the exposed parts show excessive pigmentation. So sunbathing will make the skin darker. But at the same time, for humans, melanin is a barrier to prevent ultraviolet damage to the skin. Therefore, the darkening of the skin after sunbathing is a reaction and self-protection of humans to light damage, which is beneficial to the human body.

Our skin is very fragile, and it can be damaged if we are not careful. The damage caused by ultraviolet rays is sometimes huge, especially on our face, which is exposed to ultraviolet rays. Ultraviolet rays are very harmful to the skin, especially for those who do not pay attention to facial sun protection, which will directly cause serious damage to our skin!

Ultraviolet rays can destroy the nucleic acids of bacteria and viruses, causing them to decompose and denature and lose their normal functions. They can also affect the activity of enzymes, preventing the normal metabolism and synthesis of proteins and nucleic acids, thereby causing the death or mutation of bacteria and viruses.