“…On average, 5 and 3‰ carbon and nitrogen respective isotopic enrichments between diet and collagen were employed in earlier human paleodiet studies (Ambrose and Norr, 1993;Lee-Thorp et al, 1989;Schoeninger, 1985;Van der Merwe and Vogel, 1978). Since then, more recent studies have employed variable Dd 13 C diet-col and Dd 15 N diet-col enrichments between 0 to 5 and 3e6‰, respectively, to account for conditions or circumstances pertaining to their specific paleodiet reconstructions (Bocherens and Druker, 2003;Bourbou et al, 2011;Buhay et al, 2013;Fernandes et al, 2014;Hedges and Reynard, 2007;Kellner and Schoeninger, 2007;Kinaston et al, 2012Kinaston et al, , 2013Kinaston et al, , 2014Kusaka et al, 2010;O'Connell et al, 2012;Price et al, 2012;Tykot, 2002). Importantly, some earlier and more recent studies also detected diet-specific variations in the diet-collagen fractionation factors suggesting that the exact dietary offsets (Dd 13 C diet-col , Dd 15 N diet-col ) are influenced by the isotopic compositions of the macronutrients consumed (Froehle et al, 2010).…”