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The doctor warned that people are being damaged daily by this natural source
12:38, 16 Jun 2026
People can splash out hundreds of pounds on skincare to maintain a healthy look. But ignoring one important product makes that routine worthless if people don't protect themselves against a natural factor, which can make skin age 'faster'.
NHS GP Dr Amir Khan discussed skincare and health in a recent instalment of his No Appointments Necessary podcast, highlighting the 'biggest ageing enemy' he believes most people encounter daily without thinking about. The ITV regular, familiar to viewers of Lorraine and Good Morning Britain , encouraged people to apply SPF every day, adding that he does the same.
He claims this will help prevent skin from appearing older than its true age due to sun damage. He said: "The biggest ageing thing we have in this world is the sun. The skin changes that make us look older are more likely due to sun exposure than they are actually due to age."
Collagen is the protein that holds our bodily structures together, providing skin with its elasticity. Without it, Dr Khan explains that "we start to sag and wrinkle".
The sun degrades collagen through a mechanism called photoageing, chiefly triggered by ultraviolet (UV) radiation. This not only harms existing collagen structures but also stops new ones from developing in their place, reports the Express .
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Applying sunscreen helps protect against collagen depletion by reducing the damage the sun's rays can inflict at a DNA-altering level. But as the NHS highlights, sunscreen alone is not enough.
People should always combine it with other sun safety practices, including seeking shade during peak UV hours. See more of these here .
How often should I be using SPF?
UV rays come through clouds and glass, meaning SPF is essential throughout the year - not just during the summer. As a rule of thumb, anyone looking to protect their skin should apply at least SPF 30 every day - though the amount you need depends on your lifestyle.
For instance, a single morning application is typically sufficient for someone who works indoors and only pops out briefly for errands. However, those spending extended periods outside for work or leisure must reapply SPF every two hours to keep their skin protected.
How to apply sunscreen
According to the NHS : "Most people do not apply enough sunscreen". Experts claim that adults "should aim to apply around six to eight teaspoons of sunscreen" for their entire body.
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The NHS says: "If sunscreen is applied too thinly, the amount of protection it gives is reduced. If you plan to be out in the sun long enough to risk burning, sunscreen needs to be applied twice - 30 minutes before going out and just before going out."
Most Brits also make the mistake of missing exposed skin on the face, neck and ears, and head (if you have thinning or no hair). The NHS also stresses the rule of reapplying sunscreen every two hours because "the sun can dry it off your skin".
Click here for more details from the NHS about limiting sun damage to skin.
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