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Vitamin D supplementation to prevent acute respiratory tract infections (2017)

bmj.com

21–30 of 178 posts

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#21
I can say from my own experience that the lack of vitamin D can have a significant impact on both mind and body.

I suspect that essentially all people living at relatively northern latitudes have some sort of vitamin D deficiency. From what I know you need to have your face and arms exposed to direct sunshine for at least 15 minutes/day to keep healthy vitamin D levels in the body. Good luck with that in the European/Canadian/Northern US winter.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#22

I've been wondering why it is that virus infections are supposed to "disappear" in the summer. Obviously the viruses don't actually go anywhere, so I would expect people to get sick year round. Maybe immunity boosting from Vitamin D could be part of the answer.

People spend more time indoors, often with the windows closed. Humidity might also be higher, and temperatures lower, two variables which have an effect on virus viability outside the body.

According to Wikipedia, more time spent indoors is a likely contributing factor to the flu being more active in the cold season, not the other way around.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#23

Can any physicians or researchers here verify the credibility of this site, to prevent misinformation?

This is a well-written meta analysis in a top-tier medical journal which demonstrates a convincing relationship between acute respiratory infection, Vit D baseline levels, and supplementation.

However, their conclusion that the findings warrant public health interventions and widespread supplementation is arguable. There are real risks and costs to over-supplementation, and the absolute risk reduction they demonstrate (from 42% to 40%) is not large.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#24

I've been wondering why it is that virus infections are supposed to "disappear" in the summer. Obviously the viruses don't actually go anywhere, so I would expect people to get sick year round. Maybe immunity boosting from Vitamin D could be part of the answer.

That is one hypothesis, though there are a lot https://en.wikipedia.org/wiki/Flu_season#Cause

Mind boggling that this kind of a thing isn't known. This says the total economic effect of seasonal influenza in the US alone is 87 billion per year. That's six NASA:s worth:

https://www.sciencedirect.com/science/article/pii/S0264410X0...

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#25

I've been wondering why it is that virus infections are supposed to "disappear" in the summer. Obviously the viruses don't actually go anywhere, so I would expect people to get sick year round. Maybe immunity boosting from Vitamin D could be part of the answer.

That is one hypothesis, though there are a lot https://en.wikipedia.org/wiki/Flu_season#Cause

I like the UV theory, that seasonal decline in UV reduces the chances of virus getting damaged or killed by it. So I'm pinning my hopes on that one to save me from Covad19 because I live in the topices at 400 meter elevation where the UV is pretty brutal year round. Downside, of course, is increased risk of skin cancer.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#26

Can any physicians or researchers here verify the credibility of this site, to prevent misinformation?

Assuming it's the BMJ that I know of that's the 'British Medical Journal' which is highly regarded. https://en.wikipedia.org/wiki/The_BMJ

Yes, together with New England Journal of Medicine and The Lancet, they are the ‘Nature’ equivalent of medical science.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#28

I've been wondering why it is that virus infections are supposed to "disappear" in the summer. Obviously the viruses don't actually go anywhere, so I would expect people to get sick year round. Maybe immunity boosting from Vitamin D could be part of the answer.

People spend more time indoors, often with the windows closed. Humidity might also be higher, and temperatures lower, two variables which have an effect on virus viability outside the body.

As far as i know lower humidity helps viruses spread not the other way around. In winter indor heating makes air dry. Having humidifier should help.

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#29

Table 4: > When all studies were analysed together, no statistically significant effect of vitamin D was seen on the proportion of participants with at least one upper respiratory tract infection, lower respiratory tract infection, hospital admission or emergency department attendance for acute respiratory tract infection, course of antimicrobials for acute respiratory tract infection, or absence from work or school…

You quoted the paragraph for the secondary outcomes, which doesn't diminish the results quoted in the headline.

Said that, the effect of the main outcome is not that big (if I read that correctly, it reduces your chances of getting a respiratory disease by ~4%)

Re: Vitamin D supplementation to prevent acute respiratory tract infections (2017)

#30

Unfortunately I can't find the source, but I read somewhere that it wasn't proven that Vitamin D supplements can improve outcomes after infection has occurred. Can anyone find the source on this and verify?

I unfortunately can't find the source either, but I read something about you having to take vitamin D suppliments for a while before the change could be detected in the body, ie. if you are already sick it does not matter to take suppliments where you only see the benefit after weeks or months. This seems to support what you read.
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