Many studies have tried to discover whether the increase in colds and flu in the winter is partly down to a lack of sunlight producing vitamin D in the body, but they have had mixed results. The team from Queen Mary argue that their work settles the question because they have reanalysed and pooled the raw data from 25 clinical trials involving about 11,000 patients from 14 countries. The studies that found no benefit had usually given people a large one-off dose of vitamin D rather than regular supplements.
It's from this article in the Guardian:
https://www.theguardian.com/science/201 ... y-diseases
Of course, they're not sure or all agreed it's lack of Vitamin D that's the problem but hey, that's maybe better than the huddling theory they had a few weeks ago. Basically they haven't got a clue.
BTW I do apologise for bringing this topic up with boring regularity but every so often there is a new take on it from some medical institute or other and each time I find it quite distressing. The human body it seems harbours the cold virus for the purpose of adapting the body to a change in environmental temperature when required. It's a short, unpleasant process when the virus gets to work but a beautiful one nonetheless. Why the medical profession spends so much energy trying to prevent it baffles me.