Interesting article
hopkinsmedicine.org/neurolo...
The single most consistent finding and the strongest environmental risk factor associated with RLS is iron insufficiency. Professor Nordlander first recognized the association between iron deficiency and RLS, and reported that treatment of the iron deficiency markedly improved, if not eliminated, the RLS symptoms.
This hypothesis has led investigators to examine whether the brain could be deficient in iron in the face of otherwise normal serum iron measures.
For full article see link above.