From the conclusion of the cohort sudy in the article.
Whether this was a causal or associational finding cannot be determined from our data. There is a need for randomized clinical trials which include information on the effects of 25-hydroxyvitamin D levels above 100 nmol/L.
I agree, it for sure needs more study, however I do find it interesting. =)
I heard a while back that if you take a lot of D without having enough K2, the D can lead to plaque in your arteries. The study makes no mention of K2 intake, so it seems unsurprising that people who take a lot of D can have higher rates of heart disease.
My memory can be fuzzy so maybe the D didn’t turn to plaque in your arteries, but there was some negative effect it had on your CV health. Taking vitamin K2 somehow locks the D into the “right place” in your body, so it helped with calcium processing but didn’t harm your arteries.