This paper explores the dietary behaviour of communities based on microwear analysis of dental remains recovered from ancestral archaeological sites in Nagaland, North East India. Unlike the faunal and botanical remains where studies of diet and environment have been applied, the  numerous human remains from archaeological sites were recovered over the years from the region, though studied osteologically, have not been used explore diet. The archaeological samples for this study were obtained from three archaeological sites: Jotsoma, Leshemi, and Rikhelüwong, which belong to a shared historical time frame. This work examines whether, given a similar environment and lifestyle, the nature and texture of the diet of individuals from these three sites differed. The sample sites are categorised as ancestral sites in which community lineages can be connected to modern Naga populations. In comparing the archaeological samples with samples from the contemporary population, significant variation in food-producing techniques can be observed. However, the dietary constituents consumed today appear to be similar to those eaten by ancient archaeological populations. The analysis also demonstrated the presence of grit and hard abrasive particles in the diet of the archaeological samples. the research illustrated that cooking and food preparation techniques play a vital role in understanding the dental microwear patterns in humans. Age variability in microwear is present in the samples due to variability in food preparation and cooking technique rather than a dietary change.