“…Therefore, studying past human dietary structure may provide deep insight into the origin and spread of agriculture. Stable carbon isotopic measurements of archaeological human skeletal remains have opened a new avenue to paleodietary reconstructions (Atahan et al, 2014;Hu, Wang, Luan, Wang, & Richards, 2008;Lanehart et al, 2011;Pechenkina, Ambrose, Ma, & Benfer, 2005;Wang et al, 2012). This method relies on the fact that the observed 13 C/ 12 C ratio in human tissue is a result of mixing of two end members-C3 (e.g., rice, wheat, barley, and soybean) and C4 (e.g., millet, maize, and sorghum) crops, each of which has a characteristic 13 C value (e.g., ca.…”