I came across this disorder at Willard Mental Institution, where I interned for a (thankfully) short while. This guy somehow ate a pair of jeans! Not sure if he cut them up or what. I also found pica mentioned in DSM III:
"The essential feature is the persistent eating of a nonnutritive substance. Infants with the disorder typically eat paint, plaster, string, hair, or cloth. Older children may eat animal droppings, sand, bugs, leaves, or pebbles. Pica usually remits in early childhood, but may persist into adolescence or, rarely, continue through adulthood."
It is a pretty rare disorder.
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