Why Some People Eat Dirt

 "Amid the countless edible plants and animals on Earth, there's little consideration for the ground beneath our feet. Intentionally eating dirt, also called geophagy, is a natural instinct and may serve a greater health purpose.

Some humans' urge to consume clay may stem from the activity's protective properties for the digestive system, according to new research to be published in The Quarterly Review of Biology."
via Discovery News/read more