I have no idea how we get from "x and y are potentially both symptoms of zinc deficiency" to "clearly, this is a dangerous comment that requires warnings agains

I have no idea how we get from "x and y are potentially both symptoms of zinc deficiency" to "clearly, this is a dangerous comment that requires warnings against taking excess zinc..." Not that I actually expect anyone to launch a scientific study based on my hn comment, but that is the only actual course of action I suggested.