Mucophagy

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Mucophagy (literally snot-eating) is the consumption of the nasal mucus and other detritus obtained from nose-picking. It is a common but highly taboo activity and is almost universally regarded with disgust by others, even by those who participate in this activity themselves.

Some research suggests that mucophagy might be healthy in that exposing the digestive system to bacteria accumulated in the mucus helps the body strengthen its immune system.

Mucophagy is one of a family of behaviors known collectively as pica.