The other thread of yesterday on vitamin D in pregnancy is related to this matter general-discussion-f1/topic21166.html
But the researchers have it all mixed up.
Of course, the risk of MS relates to the date of birth.
What is important here is the vitamin D available during the main phases of cellular growth.
The cell composition (and number of vit D gates) is related to the vit D available in the blood,
that is of the mother (fetus) and the own blood stream (adolecence).
The vitamin D relationship itself is more complex or in the minds often convolved.
There is the matter of the cell composition.
Vit D supplementation then is probably affecting the gut flora (and peptides for natural antibiotics).
The vit D metabolism in the blood then may in some way be related to the gut concentration
but there is an advanced regulatory loop as well between active and non-active vit D
and that is influenced by disease activity (reverse active to non-active).
In this same context, it is unclear to me whether there is a difference between the own body generated D and the administered D.
A highly consistent picture is elaborated on general-discussion-f1/topic15188.html
When the Vit D receptor is enabled again, 1000 or more genes are transcribed again,
with effects on the gut and other organs, and also the nerves..
The body is able to take matabolic control again..