Published online by Cambridge University Press: 08 August 2009
Introduction
The impact of the environment on our lives over the aeons has been a dominant force helping to shape our genome, and within it the encrypted forms and functions that characterise our species. Throughout most of our evolutionary history, the environment has posed its nutritional challenges within the rubric of malnutrition and infection, and the drive to establish and retain food security has so dominated our activities over these millennia that survival advantage has accrued to thrifty genomes and thrifty ‘phenomes’ (Neel 1999, Hales and Barker 2001). That we should now be threatened by agricultural surplus is perhaps poetic justice. Regardless, in establishing our mastery over nature, and extracting three square meals per day, every day, as well as essentially relieving ourselves of the requirement for muscular work to secure food or defend life, we have fallen prey to the asynchronous kinetics of biological adaptation and environmental change (Gluckman and Hanson 2004). We have simply not had enough evolutionary time to adapt successfully to the increasing availability of food and reduction in physical activity required for daily life that have taken place at an increasingly rapid pace over the past 300 years.
The invention of agriculture some 10,000 years ago enabled the emergence of modern civilisations by ensuring surplus, fostering labour specialisation and thus the eventual rise of the capitalist approach to economic growth (Diamond 1998). Consistent food supply for populations enabled escape from malnutrition and infection.
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