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The first day of vacation on the beach can end up being a bad experience, and guilt always points in the same direction: sunscreen. It turns out that a new study has shown that most use the protector wrongly, only getting 40% of the protection factor.
When the first sunscreen product was marketed in the mid-nineteenth century, it provided a sun protection factor (SPF) of only 2. Six decades later, researchers created a sunscreen that was resistant to water, a solar spray, a long-lasting sunscreen and a sunscreen with an SPF of all types up to 100.
Although the technology behind sunscreen has come a long way, the l & rsquo; Product effectiveness depends to a large extent on us, the way it is applied. And for more than 60 years, it turns out that most have misapplied the bloody sticky cream.
New research has revealed that when the sunscreen is applied in a typical way, it provides only 40% of the protection. this could be predicted according to the protection factor. In fact, most skin cancers are caused by damage caused by DNA from UV rays in the sunlight.
The study conducted by researchers at King's College London revealed that skin protection against UV-induced DNA damage under- underlying cancer was significant only when the sunscreen was applied at a thickness of between 1.3 and 2.0 milligrams per square centimeter, while most people applied only one layer of 0.75
Therefore, it is a quantity problem. Solution? Scientists suggest that we should increase our protection by using a top shield to offset the tendency to apply too thin sunscreen. According to Antony Young, Professor of Experimental Photobiology at King's College London, and senior author:
Since most people do not wear sunscreens as proven by the manufacturers, it is best that people wear a much higher protector than they believe it is necessary
The truth is that the classifications of factors are based on the assumption that the sunscreen is applied with a thickness of 2 milligrams per square centimeter, according to the manufacturer's recommendations, but the average user generally applies a lot less, according to previous studies. For Young:
People often receive much less protection than they think. For example, if you get an FPS20 and you use it with a thickness of less than 0.75 milligrams per square centimeter, your level of protection could be as low as an FPS4.
Studying the level of protection of applied sunscreens in a manner that more closely resembles the daily use of people, they measured the amount of damage to the DNA on the skin of 16 volunteers who used different thicknesses of sunscreen when they were exposed to ultraviolet light.
Participants were divided into two groups of eight: one group received a single dose of UV radiation to mimic sun exposure, and the second group received multiple doses over a five-day period to mimic a continuous exhibition of holidays.
Volunteers received their doses of UV radiation within 15 minutes after the application of sunscreen and biopsies were taken from the skin immediately after exposure to the rays . By the way, the sunscreen tested in the study was in compliance with EU regulations.
In addition, scientists also varied the amount of UV radiation during the experiment to try to replicate the conditions in more typical holiday destinations. Result? Skin biopsies revealed that the "holiday group" that used the sunscreen in the highest thickness recommended by the manufacturer also had the most important protection against damage, even after being exposed for several days to high doses of UV. comparison with those who used the most typical, the thin layer of sunscreen. For young people:
There is no doubt that sunscreens provide significant protection against the carcinogenic impact of the sun's ultraviolet rays. However, this research shows that the way sunscreen is applied plays an important role in determining its effectiveness.
In other words, the research does not just indicate how the sunscreen should be applied. cream correctly, it also shows how important it is to choose a factor of 30 or more. Yes, theoretically one of the 15 should suffice, but it seems like like in many other things, it does not go beyond the theory. [ScienceAlert, The Guardian]
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