Prehistoric teeth give up their secrets
(PHYSorg.com Archaeology & Fossils)

The isotope values of food consumed are reflected in the individual`s tissues. As bone is constantly being turned over by remodelling, analysing the stable isotope ratios of bone collagen can shine a light on the main dietary protein sources consumed over many years. New research uses this factor to analyse diet, migration and society between the Neolithic (6,500 - 4,500 BC) and Iron Age (900-100 BC).