Heart attacks peak in January and your doctor will tell you it is the cold, and the reason is sitting in your skin waiting for a light the same doctor told you to block.
The skin holds a store of nitrite. UVA lands on it and the nitrite becomes nitric oxide, the molecule that widens blood vessels, the one in the angina spray and the one behind the blue pill.
In Edinburgh 20 minutes under a UVA lamp dropped volunteers' blood pressure and kept it down after the lamp went off. No vitamin D involved. Vitamin D takes days. This took a tea break.
So daylight has been running the nation's blood pressure down every day it is out, since before there was a nation.
Then the advice arrived. Stay in the shade between 11 and 3. Cover up. Wear a broad spectrum cream, and broad spectrum means it blocks UVA, the one wavelength that does this job, by design.
A country this far north now spends October to March indoors and April to September under a cream built to stop the only thing that was keeping its arteries open.
The pressure climbs. Blood pressure itself is seasonal, higher in every winter it has ever been measured in. The tablets go out, millions a month, to bring it back down by chemistry. And the deaths arrive on schedule in the dark months and get filed under cold.
Except the winter peak turns up in Los Angeles and in Hawaii, where January is not cold and nobody is shovelling a drive. What Los Angeles has in January is less daylight.
Swedish women who avoided the sun for 20 years died at the rate of smokers. That paper is a decade old and not one bottle mentions it.
Beetroot juice is sold to gym lads for the nitrate in it. A face in daylight makes the same molecule for nothing.
They put a country on blood pressure tablets and told it to stay out of the cure.
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