Posted here Monday, June 07, 2004 at 11:50:53 AM 
Diet presasures, not unlike energy pressures. This from Mexico in the period about 1100 AD.
http://antiquity.ac.uk/ProjGall/leach/index.html
The addition of more costly under-used foods - that require prolonged cooking in cook stone earth ovens - to the diet during the Classic Mimbres period is a variable of increasing diet breadth not well understood. As an element of land-use intensification, the presence of large, cook stone earth ovens marks a new avenue of subsistence and residential mobility research for the region. Further survey and subsequent excavation will provide important data for developing models (see Thoms 2003) of the spatio-temporal distribution of these cooking facilities and the evolving role of cook-stone technology and overall developmental trends in cooking techniques during the Holocene.
How could a society under pressure refrain from expaning the spectrum of foods, which in turn requires more energy (longer cooking) which further denudes the landsacpe?
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