2020/10/06 15:17:51

Don't forget to take measures against UV rays

I think "it's sunny today so it's going to get sunburned" and "it's cloudy so it's okay"
Ultraviolet rays are falling even if it is cloudy.

It's easy to think that when you're exposed to the sun, you're exposed to a lot of ultraviolet rays, but it's because of infrared rays that you feel hot, and in fact, ultraviolet rays are nothing but hot.
That's why you inadvertently get sunburned.


Learn more about UV rays and prevent sunburn

Of those who inadvertently get sunburned, the most common reason for not taking UV protection is because it was cloudy.
Even when it's cloudy, 70% of UV rays damage the skin through the clouds.

Ultraviolet A waves pass through the glass, so even if you are indoors, you will get a sunburn.


About ultraviolet A wave and B wave

Ultraviolet A wave (UVA) has a wavelength of 320 to 400 nanometers and is called long-wave ultraviolet light.
Although the energy is weak, it penetrates deep into the skin with wrinkles, causing collagen aging and suntan (blackening of the skin).

Since it easily penetrates clouds, the UVA dose does not decrease much even on cloudy days.

Ultraviolet B-wave (UVB) has a wavelength of 280 to 320 nanometers and is called short-wave ultraviolet. It has strong energy and causes sunburn (redness and tingling).
However, although it has strong energy, it is blocked to some extent by clouds and glass windows.


About UV protection

When you think of UV protection, you can think of parasols, hats, scarves, gloves, sunglasses, etc., but sunscreen cream is still the most effective.
The skin consists of three layers: the epidermis, the dermis, and the subcutaneous tissue, but ultraviolet A waves (UVA) reach the dermis, so it is necessary to take measures against ultraviolet rays so as not to suffer from stains.


About the meaning of SPF and PA in sunscreen cosmetics

SPF represents the ability to cut ultraviolet B waves.
It is said that SPF 20 to 30 is suitable for daily use, but this means that it is okay if you spend less than 2 to 3 hours outside.
Try to choose a number according to the time you go out.

The Dermatological Association promotes SPF20 for daily use.
Based on this standard, if you spend a lot of time going out, you should choose a slightly higher number.

The PA value represents the ability to cut ultraviolet A waves.
The reason why it is displayed as + is that it cannot be clearly expressed by numbers because symptoms such as darkening of the skin appear several days after being exposed to ultraviolet A wave.

It is recommended to choose a UV cream PA suitable for daily life of about PA ++ to PA ++++ and an SPF of about SPF 15 to 30.
When going to the sea or mountains, PA +++ and SPF 50 are recommended.
It is better to use sunscreen cosmetics properly depending on the situation, which will reduce the burden on the skin.


For sunscreens that you usually use, you can rest assured that you should choose one that does not use UV absorbers or one that is labeled as "non-chemical."

There are many UV products on the market such as UV-cut hoodies, neck covers, cotton mufflers, arm covers, gloves, hats, sun visors, glasses, etc., but you can choose the one that suits you best and take measures against UV rays. let's do it.


Japanese skin type

Japanese skin types are divided into 3 types.
(1) "A type that turns red immediately when exposed to ultraviolet rays, but does not turn black"

(2) "A type that turns red when exposed to ultraviolet rays and turns black after a few days"

(3) "A type that does not turn red when exposed to ultraviolet rays but turns black immediately".


Person ① is the person with the weakest skin against UV rays, and person ③ is the person who is strong against UV rays. About 60% of Japanese are type ②.

People in (1) are originally fair-skinned, and people in (3) are dark-skinned, but fair-skinned people have less active melanocyte activity and are less likely to have spots. It can be said that dark-skinned people have skin that is prone to stains due to the active activity of melanocytes.


UV-induced photoaging is inevitable for all types of skin

Photoaging is the dullness, wrinkles and blemishes of the skin caused by exposure to UV rays.
Unprotected exposure to UV light can damage the DNA of epidermal cells and, in rare cases, lead to skin cancer.


Is it true that you should be exposed to UV rays for your bones?

It is said that "the bones are weakened when not exposed to the sun", but it is a fact that ultraviolet rays activate vitamin D and help to make bones.
However, that is a story of Scandinavia, and in Japan, no matter where you live or how much you take measures against UV rays, you are exposed to UV rays somewhere in your body.

You don't need to be exposed to UV light because a small amount of UV light is enough to activate Vitamin D.
Ultraviolet rays have many disadvantages and can cause skin aging and cataracts in the eyes.

It seems that neither adults nor children need to be exposed to UV rays because of their bones.


Polyphenols and vitamins that are effective against UV rays

Human skin contains antioxidants such as urocanic acid and glutathione, which work to remove the active oxygen produced by ultraviolet rays, but they decrease with age.
Therefore, it is necessary to consciously ingest antioxidants such as polyphenols and vitamins from foods.

Eat foods that contain the following three antioxidants to build a body that is resistant to UV rays

① Vitamins

Green-yellow vegetables containing vitamin A, green-yellow vegetables and light-colored vegetables containing C, soybeans and brown rice containing vitamin E, peanuts, olive oil, etc.

② Polyphenol

Green tea and cacao containing catechins, soybean germ containing isoflavones, sesame seeds containing lignans, etc.
Red wine containing flavonoids, cocoa, buckwheat, onion skin, and citrus bags also have antioxidant properties.

③ Carotenoid

Tomatoes, carrots, oranges, and pineapples also have the function of removing active oxygen generated by ultraviolet rays.

In addition, it is necessary to take a small amount of minerals to remove active oxygen.
Liver containing iron, oysters containing zinc, onions and leeks containing selenium, squid and octopus containing copper
Try to eat walnuts and almonds that contain manganese.




UV rays are shining even on cloudy days, so prevent "inadvertent sunburn".

Ultraviolet rays that have accumulated little by little appear as stains and suddenly appear.
The stains that have been created will not disappear easily.

Even if it is a little troublesome, daily UV protection can be said to be a shortcut for anti-aging.