Against Sunscreen Absolutism

It’s long been known that sun exposure triggers vitamin D production in the skin, and that low levels of vitamin D are associated with increased rates of stroke, heart attack, diabetes, cancer, Alzheimer’s, depression, osteoporosis, and many other diseases. It was natural to assume that vitamin D was responsible for these outcomes. “Imagine a treatment that could build bones, strengthen the immune system and lower the risks of illnesses like diabetes, heart and kidney disease, high blood pressure and cancer,” The New York Times wrote in 2010. “Some research suggests that such a wonder treatment already exists. It’s vitamin D.” By 2020, more than one in six adults were on that wonder treatment in the form of daily supplements, which promise to deliver the sun’s benefits without its dangers.