Document Detail

Effects of food processing on masticatory strain and craniofacial growth in a retrognathic face.
MedLine Citation:
PMID:  15183669     Owner:  NLM     Status:  MEDLINE    
Changes in the technology of food preparation over the last few thousand years (especially cooking, softening, and grinding) are hypothesized to have contributed to smaller facial size in humans because of less growth in response to strains generated by chewing softer, more processed food. While there is considerable comparative evidence to support this idea, most experimental tests of this hypothesis have been on non-human primates or other very prognathic mammals (rodents, swine) raised on hard versus very soft (nearly liquid) diets. Here, we examine facial growth and in vivo strains generated in response to raw/dried foods versus cooked foods in a retrognathic mammal, the rock hyrax (Procavia capensis). The results indicate that the hyrax cranium resembles the non-human primate cranium in having a steep gradient of strains from the occlusal to orbital regions, but differs from most non-anthropoids in being primarily twisted; the hyrax mandible is bent both vertically and laterally. In general, higher strains, as much as two-fold at some sites, are generated by masticating raw versus cooked food. Hyraxes raised on cooked food had significantly less growth (approximately 10%) in the ventral (inferior) and posterior portions of the face, where strains are highest, resembling many of the differences evident between humans raised on highly processed versus less processed diets. The results support the hypothesis that food processing techniques have led to decreased facial growth in the mandibular and maxillary arches in recent human populations.
Daniel E Lieberman; Gail E Krovitz; Franklin W Yates; Maureen Devlin; Marisa St Claire
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of human evolution     Volume:  46     ISSN:  0047-2484     ISO Abbreviation:  J. Hum. Evol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-08     Completed Date:  2004-11-16     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0337330     Medline TA:  J Hum Evol     Country:  England    
Other Details:
Languages:  eng     Pagination:  655-77     Citation Subset:  IM    
Department of Anthropology, Peabody Museum, Harvard University, 11 Divinity Avenue, Cambridge, MA 02138, USA.
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MeSH Terms
Adaptation, Physiological / physiology
Bite Force
Food Handling*
Hyraxes / anatomy & histology,  physiology*
Maxillofacial Development / physiology
Retrognathism / physiopathology*
Skull / anatomy & histology
Species Specificity
Stomatognathic System / anatomy & histology,  physiology*
Grant Support

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