Forgive me, I have no link, I feel like medical and nutrition advice changes 180 daily.
Does this ring a bell to anyone?
I think you may be referring to how D isn't a primary treatment for SAD. It certainly doesn't hurt to get more D in the winter for a lot of other reasons, but SAD is primarily treated via light boxes or anti-depressants.
That being said, vitamin D levels are slowly becoming the new "have you thought about losing some weight" in medicine. Being low on it isn't great, but its not the cause of the health problems people complain about.
https://www.nejm.org/doi/full/10.1056/NEJMoa1809944 https://www.nejm.org/doi/full/10.1056/NEJMoa2202106 https://www.thelancet.com/journals/lanwed/article/PIIS2213-8... https://pubmed.ncbi.nlm.nih.gov/24445737/ https://pubmed.ncbi.nlm.nih.gov/24697969/ https://pubmed.ncbi.nlm.nih.gov/26992108/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2290997/
There “mood” and all that, but placebo has a heavy affect here.
The more direct question is how lifespan and cancer rate track between:
High D levels via supplementation and low sun exposure
High D levels via no supplementation and high sun exposure
Low D levels with low sun exposure
Low D levels with high sun exposure
(And of course those between)
The goal is to determine whether D itself is improving longevity and cancer rate, which would be implied by improved metrics in the group with high supplementation and low sun exposure. If this group doesn’t fare better, the D levels may be a misleading indicator of health, and those living longer with high D levels are doing so because of their increased sun exposure (as opposed to the raw blood D level offered by supplementation)
Right, but nobody's taking supplements to see number go up. They're after some health benefit, of which evidence is scarce.
It’s really hard to believe that all the benefit of the sun can be achieved in a single pill.
At least I’m clearly human
It's like the people who attack grammar in arguments instead of the core point. I've seen enough people doing this across the Internet to know the reason they do it. And it has everything to do with being a smug asshole and nothing to do with helping.