"Finally, some studies have found a link between severe iron-deficiency anemia and cravings for non-food substances such as ice, paper, or clay (a condition known as pica). If you do have these cravings, don't give in to them, and be sure to tell your healthcare provider."
I like how they have to tell you not to give in to your cravings to eat non-food substances.
"Hmm. I could go to the doctor. Or I could just eat this clay."
(Don't worry - I'm not craving non-food substances)