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

Sera L. Young*, Joshua D. Miller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)81-90
Number of pages10
JournalClays and Clay Minerals
Issue number1
StatePublished - Feb 15 2019


  • Anthropology
  • Biocultural
  • Cross-cultural
  • Detoxification
  • Geophagy
  • History
  • Nutrition
  • Pathogens
  • Pica
  • Supplementation

ASJC Scopus subject areas

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)


Dive into the research topics of 'Medicine Beneath Your Feet: A Biocultural Examination of the Risks and Benefits of Geophagy'. Together they form a unique fingerprint.

Cite this