I know some pregnant women sometimes eat potting soil. It's not common, but it happens. As for never having eaten anything like that, I've personally eating a few paper plates, but I think that was more being wierd for the sake of it. I was a strange teenager.

I've always been anemic, but only went through a pica phase when I was younger. Never ate anything, just chewed everything, usually in concert with disassembling it. I used to carefully nibble along the seam of cheap paper cups and take them apart to leave the sides, bottom and (plastic) cap all neatly piled on top of each other, stuff like that. At some point, I don't even remember how, I had taken a book from its bindings and set the pages aside.

Weird stuff, but I never saw it as weird when I was doing it. My parents just thought it was childish curiosity, wanting to see how things are all apart.