On dirt & corn starch eating demographic

A certain demographics in USA have an insatiable taste for eating dirt, clay, chalk, corn starch, dry wall, pottery, and even bricks. It's a practice called geophagy or pica. Also recommend videos:
https://rumble.com/v4gs5h9-best-chicken-recipe-on-people-who-wash-their-chicken.html
https://rumble.com/v3nuwx1-chocking-revelation-of-smoke-detector-ignorers.html