From the Matt Ridley Online Blog.
As we face six tough months of curfews, isolation and economic misery, with vaccines a distant hope, testing struggling to control the virus, and the hospitalisation rate once again rising, it’s surely time to try anything reasonable to slow the pandemic down. There is one chemical that is known to be safe, known to be needed by many people anyway, known to have a clinically proven track record of helping people fight off respiratory diseases, and is so cheap no big firm is pushing it: vitamin D. It is not a silver bullet, but growing evidence suggests that it might help prevent Covid turning serious in some people.
In May, arguments on the link between Vitamin D deficiency and its association with poor Covid outcomes started to gather pace. That month, the Health Secretary’s attention was drawn to two studies showing a strong association between the incidence and severity of Covid-19 with vitamin D deficiencies in the patients. Vadim Backman of Northwestern University, one of the authors of one of those studies, said about healthy levels of vitamin D that “Our analysis shows that it might be as high as cutting the mortality rate in half.”
When asked to look at the evidence, Matt Hancock perfectly reasonably handed the question to Public Health England to answer. They attempted to analyse the statistical data and came up unconvinced. The problem is that a correlation is not a proof of cause and effect, and a correlation (albeit a very strong one) is all that we had at that point. Or almost all that we had.
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