why is geophagy treated like dirt?

@article{Henry2003whyIG,
  title={why is geophagy treated like dirt?},
  author={Jacques Henry and Alicia Matthews Kwong},
  journal={Deviant Behavior},
  year={2003},
  volume={24},
  pages={353 - 371}
}
Geophagy is treated as adaptive behavior in most of the world and as deviant behavior in American culture. The dominant nutritional approach has strongly documented the useful contribution the consumption of clay brings to the diet of pregnant women and children. The same practice, found mostly among minority groups, is stigmatized in American culture. The different treatment of geophagy appears to rest on the different meaning of dirt, a formative element whose consumption is normalized in… 
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