Pica, the compulsion to eat dirt & other oddities, is found in many cultures

http://www.washingtonpost.com/national/health-science/pica-the-compulsion-to-eat-dirt-and-other-oddities-is-found-in-many-cultures/2012/05/14/gIQA1HhXPU_story_1.html

/ diet mineral deficiency kaolin /