New study may provide evidence that our prehistoric ancestors understood plant consumption and processing long before the development of agriculture.
This is according to a study published July 16, 2014 in the open-access journal PLOS ONE by Stephen Buckley from University of York and colleagues.
Evidence of plant consumption before the adoption of agriculture is difficult to find; such evidence is meaningful for understanding how much prehistoric people knew about the ecology and potential therapeutic properties of plants. Scientists in this study extracted and analyzed chemical compounds and microfossils from dental calculus (calcified dental plaque) from ancient human teeth at Al Khiday, a pre-historic site on the White Nile in Central Sudan, Africa. One of the five sites at Al Khiday is predominantly a burial ground of pre-Mesolithic, Neolithic, and Later Meroitic age remains. As a multi-period cemetery, it can provide us with a useful long-term perspective on any materials recovered there.
Lead author Karen Hardy, said: "By extracting material from samples of ancient dental calculus, we have found that rather than being a nuisance in the past, the purple nut sedge's value as a food, and possibly its abundant medicinal qualities, were known." She added, "We also discovered that these people ate several other plants, and we found traces of smoke, evidence for cooking, and for chewing plant fibres to prepare raw materials. These small biographical details add to the growing evidence that prehistoric people had a detailed understanding of plants long before the development of agriculture."