My husband's eldest nephew in Germany had it when he was a little kid. He was sent to therapy and eventually got passed it. In his case, he ate fur and hair.

I never had Pica, but when I was a kid I went through a phase where I ate peanut shells. Believe me that it was a painful habit! Not the eating of them, but the "getting rid of them" eventually. Bloody mess! I don't advise it.