Pasalao

ກາຣກິນດິນ ມີຢູ່ຫລາຍບ່ອນໃນໂລກ

Eating dirt has a unique history. For starters, it's not a recent phenomenon. There's evidence that our ancestors were eating dirt at least 2 million years ago, when Homo sapiens were still Homo habilis.

Nutritional anthropologist Sera Young at Cornell University says it's often thought that slaves introduced the practice to the U.S. from sub-Saharan Africa during the trans-Atlantic slave trade. But she says this behavior was practiced independently among Native American populations long before Columbus arrived.

In her book, Craving Earth, Young says eating dirt is one component of a disorder known as pica, in which people compulsively crave things that aren't food, like starch, charcoal and ice.