I was in the garden with a friend and her 6-month-old baby recently. The second the sun came out, anxiety clouded her face. She darted inside, reappeared with a bottle of sunscreen, and administered it liberally to the squirming infant, and then to herself. Not in the habit of offering unsolicited advice, I bit my tongue. But I was really biting it on this occasion because what I know about conventional sunscreens makes it very hard for me to sit and watch anyone putting such a toxic substance on themselves, let alone on a child.
My friend was just doing what any concerned mother naturally does given what we are told about the sun. She was following the advice of the world's leading doctors and dermatologists to protect her child from something we are told can cause deadly disease.
But when you stop and think about it, the idea that the sun is bad for us is completely nuts! Our species evolved in the tropics, under the sun, without houses, clothes, hats or sunscreen. Skin cancer rates are on the increase yet we get a tiny fraction of the sun exposure our ancestors did. Clearly there is something else at play here.
Did someone say ozone layer? Yes, there are parts of the world (for example, Australia) which have experienced both ozone depletion and an increased incidence of skin cancer, and there is evidence of a link there. But there are many other parts of the world where skin cancer rates are increasing despite the fact there has been no ozone depletion, so this isn’t the explanation we’re looking for. For example, skin cancer rates in Norway increased by 350% for men and 440% for women during the period 1955 to 1984. The ozone layer did not change during this period.
Skin cancer was very rare 100 years ago and is still very rare among many populations. For example, there is virtually no skin cancer in Africa, where people stay in the sun all day long without sunscreen. If you think that's down to the protective effect of darker skin pigmentation, think again: people with African heritage who live in America have very high rates of skin cancer.
So let's cut to the chase. What is causing the increase in skin cancer?
Continue reading "The truth about sun exposure, sunscreen and skin cancer" »


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