It drives me crazy – the new JACI review with a detailed explanation how VDD (vitamin D deficiency) induces food allergy (FA). Unfortunately, it has never been show that FDD is related to FA – while the opposite may be true…

Until we have the vitamin D feeding data ready for publication from the Europrevall survey, I can only back in history when we started the vitamin hypothesis back in 1998.
Roitt’s Essential Immunology was writing at that time on page 85

Vitamin D is an important regulator … The vitamin is a potent inhibitor of T cell proliferation and of cytokine production by Th1 cells.

The same view is shared in the more recent 11th edition on page 228:

By downregulating macrophage activity, Th1 effectiveness is decreased

At least I am pleased to read that

All chemical compounds of vitamin D for supplementation are supraphysiological #$*!