When i said "immigrants to Canada from a certain country" I didn't think about the Muslim momen wearing burquas so that they are entirely covered and probably have a severe vitamin D defifiency unless they take a supplement.
I am elderly and I am living in a country that has only a small amout of weak sunshine in the winter. Therefore I am at risk of a deficiency! I better gobble some vitamin D pills each winter. It is too late for the crippled people.