The big question is whether taking vitamin D supplements would address this, or whether having low vitamin D just happens to correlate with the real risk factors (sedentary, indoor lifestyle; unhealthy diet; obesity; etc.).
That’s the obvious question that’s specifically raised as unanswered in all of these studies.
But given the risks of supplementing vitamin D are about as close to zero as you can get it seems likely it’s worth the gamble that it’s a causal link.
If you’re right, various severely beneficial health effects and potentially protection from one cause of death. If you’re wrong... fewer beneficial health effects?
