Direct evidence of milk consumption from ancient human dental calculus

C. Warinner, J. Hendy, C. Speller, E. Cappellini, R. Fischer, C. Trachsel, Jette Arneborg, Niels Lynnerup, O.E. Craig, D.M. Swallow, A. Fotakis, R.J. Christensen, J.V. Olsen, A. Liebert, N. Montalva, S. Fiddyment, S. Carlton, M. Mackie, A. Canci, A. BouwmanF. Rühli, M.T.P. Gilbert, M.J. Collins

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Milk is a major food of global economic importance, and its consumption is regarded as a classic example of
gene-culture evolution. Humans have exploited animal milk as a food resource for at least 8500 years, but the
origins, spread, and scale of dairying remain poorly understood. Indirect lines of evidence, such as lipid
isotopic ratios of pottery residues, faunal mortality profiles, and lactase persistence allele frequencies,
provide a partial picture of this process; however, in order to understand how, where, and when humans
consumed milk products, it is necessary to link evidence of consumption directly to individuals and their
dairy livestock. Here we report the first direct evidence of milk consumption, the whey protein
b-lactoglobulin (BLG), preserved in human dental calculus from the Bronze Age (ca. 3000 BCE) to the
present day. Using protein tandem mass spectrometry, we demonstrate that BLG is a species-specific
biomarker of dairy consumption, and we identify individuals consuming cattle, sheep, and goat milk
products in the archaeological record. We then apply this method to human dental calculus from
Greenland’s medieval Norse colonies, and report a decline of this biomarker leading up to the abandonment
of the Norse Greenland colonies in the 15th century CE.
TidsskriftScientific Reports
Antal sider6
StatusUdgivet - 2015