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Medicine Beneath Your Feet: A Biocultural Examination of the Risks and Benefits of Geophagy

Authors
  • Young, Sera L.1
  • Miller, Joshua D.1
  • 1 Northwestern University, Evanston, IL, USA , Evanston (United States)
Type
Published Article
Journal
Clays and Clay Minerals
Publisher
Springer International Publishing
Publication Date
Feb 01, 2019
Volume
67
Issue
1
Pages
81–90
Identifiers
DOI: 10.1007/s42860-018-0004-6
Source
Springer Nature
Keywords
License
Yellow

Abstract

Geophagy is the intentional consumption of earth. Although widely documented among vulnerable populations, including children and pregnant women, the causes and consequences of geophagy remain poorly understood. Relevant literature was, therefore, reviewed to describe geophagy across species, geographies, life stages, and disease states. After a brief consideration of hypothesized etiologies, the potential harmful and beneficial consequences of geophagy are described, considering current evidence for each. Data available to date suggest that the greatest potential risks of geophagy include toxicity or heavy metal poisoning, and diseases resulting from consumed clays binding nutrients and beneficial pharmaceuticals in the gut. Evidence also suggests that geophagy may be beneficial by protecting against harmful pathogens and toxins through two distinct physiological pathways. Future research should explore causal relationships between geophagy and iron deficiency, as well as investigate the biological and psychosocial conditions that govern geophagy.

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