How does vitamin A deficiency arise?
I am living in a "developed" country, so excuse me if I miss some facts that are real, and threatening, in other parts of our world.
I heard about https://en.wikipedia.org/wiki/Vitamin_A_deficiency , but looking at what foodstuff contains vitamin A or precursors, I'm at loss how anyone can suffer from vitamin A deficiency.
Obviously, I'm lacking some information here.
One thing that looks particularly misleading is when you are presented with vitamin A contents of foods, neglecting precursors like carotenoids that can be easily converted to vitamin A as needed.
As a (sometimes misleading) rule of thumb, I was thinking that most yellow or orange looking food was prone to contain vitamin A or some of its precursors.