How to Survive in a Sunburned Country
Lately, sunscreen has faced some controversial bad press from influencers on social media platforms like TikTok. The claims include that it’s toxic, blocks the natural absorption of vitamin D, and even accumulates in the bloodstream. So, is sunscreen good or bad for us?
From Ozone to No-Zone
Australia has the highest rates of skin cancer on Earth. As many as two out of three Australians will be diagnosed with skin cancer during their lifetime, according to the Cancer Council. Australians often blame this statistic on an apparent hole in their section of the ozone layer. While it’s true there is a hole in Earth’s ozone layer, this gaseous stratospheric gap occurs only over Antarctica and only during spring. That doesn’t mean the sun isn’t more damaging here. Australia’s UV levels are among the highest in the world and are usually measured as extreme throughout summer. This is a result of the elliptical orbit of the Earth around the sun. This, coupled with a predominantly fair-skinned Anglo-European population, is why Aussies need to prioritize sun protection.
Modern sunscreens were often cited to have originated in Australia in 1938, but the historical use of sun protection dates back as far as 3000 BCE. Ancient Egyptians used crushed lotus petals and rice bran to dissuade the North African sun. Even the ancient Greeks smothered their chiseled chests in olive oil, which reportedly has an SPF of around 8. Currently, there are two primary types of sunscreens, which work to resist UV radiation in different ways. Mineral sunscreens like zinc oxide (often marketed as zinc) create a thin layer of metals that physically block some of the sun’s UV rays. Chemical sunscreens convert the UV rays into heat to lower the sunburn risk.
Sun Protection Factor
Professor Rachel Neale researches sunscreen and cancer at QIMR Berghofer. "It’s important to be clear that sunscreens were originally designed to stop sunburns," says Rachel. "So all the testing of sunscreen that is done is how well it works to stop a sunburn." The SPF (sun protection factor) number is about effectiveness at stopping burns, but it turns out that sunscreen can also reduce the risk of skin cancer. Australians are advised to use it on all days when the UV index is forecast to get to 3 or greater. That’s all year for some parts of Australia and most of the year for everywhere else.
What the SPF?
An over-reliance on sunscreen can be counterintuitive. "People use sunscreen to avoid getting sunburned and therefore stay outside for longer than they otherwise would," says Rachel. However, both types of sunscreen still let some UV through. In fact, the SPF number is a measure of how much longer it would take you to burn than it would without wearing any sunscreen. If you would normally get burnt in 10 minutes at the current UV rating, wearing SPF 30+ means it would take roughly 300 minutes to receive that same burn. Provided, of course, you are wearing the correct amount of sunscreen. A 5ml teaspoon for each limb, face, front and/or back of your body that’s exposed to the sun. (Which nobody does.) Exposure to UV radiation causes genetic mutations and DNA damage, which is the origin of most skin cancers. Essentially, sunscreen is most effective when used correctly.
Where’s the Fire?
Despite all this, certain corners of social media are promoting the view that sunscreen isn’t all it’s made out to be. In recent years, some chemicals have been banned in US states due to the damaging effect they have on beachside waters and coral reefs. It seems concerns were raised after two recent studies noted certain materials present in chemical sunscreens appear to accumulate in the bloodstream. There are some links to neurotoxicity and the endocrine system, but the evidence is very inconsistent and a long way from becoming solid proof. Rachel suggests that, although these studies are important, it likely isn’t the full story. One study analyzed chemical sunscreens administered at the maximum dosage, which is far higher than experts advise. "I think it’s really important to note that that does not mean they’re harmful," says Rachel. "The US Food and Drug Administration, the FDA, said that we actually need to do some more research on these sunscreens to ensure that they’re safe. But they did not say they are not safe."
The Bottom Line
Since sunscreen was invented, there has been extensive research into its efficacy and potential side effects. At this point in time, one thing is certain. "Skin cancers kill people, they disfigure people and we spend a fortune treating them," says Rachel. "We spend more on treating skin cancer than on any other cancer in Australia." The best advice is to use sunscreen as directed. In reasonable amounts, in conjunction with several other sun-protection strategies.
Reference : https://medicalxpress.com/news/2025-05-survive-sunburned-country.html
