Sunlight causes your skin to produce vitamin D -- a fact that, ironically, means that sunscreen campaigns may have made millions of people chronically short of this critical nutrient, and put them at a greater risk of skin cancer, rather than reducing their risk.
Research shows that a very low level of vitamin D is a major risk factor for melanoma. This flies in the face of the idea that it is too much sun that increases your melanoma risk.
According to Professor Angus Dalgleish, writing in the Daily Mail:
“Research shows that a large percentage of people in the UK are deficient in vitamin D partly because we can’t make any from the sun for about six months of the year ... I’d like to see all other cancer units automatically checking their patients’ blood levels. It’s cheap and quick and I guarantee they would be amazed at just how low many were.”