Recently it has been reported that a three year old girl has this disorder.
While her favourite delicacies are rocks and sticks, Natalie has been known to wolf down almost a whole brick, 'like it was a chocolate chip cookie'.
Her mother Colleen, 31, says every day is a constant battle of wills as she tries to stop her daughter eating something that could kill her.
Colleen said: 'She doesn't try to eat glass so much since it hurt her, but she will try and eat rocks and sticks she finds in the garden.
'I have had to call this poison helpline so many times that it's on my speed dial. You name it Natty's tried to eat it.
Read more: http://www.dailymail.co.uk/health/article-2041931/Toddler-addicted-eating-munches-LIGHTBULB.html#ixzz1Z6evUB59