Consistent eating of non-nutritive, non-food substances is a symptom of the disorder known as pica.
A variety of materials, including but not limited to ice, dirt, clay, chalk, paper, hair, soap, and more, can be used in a pica.
Although the precise cause of pica is not fully understood, it is thought to be related to a number of conditions, including:
1. Zinc or iron insufficiency: Some people with pica may also have underlying nutritional abnormalities such iron or zinc deficient anemia.