Résumé : The CRUMBEL project stands for Cremation, Urns and Mobility – Population dynamics in Belgium, and focusses on the study of cremated human remains from Belgium dating from the Neolithic to the Early Middle Ages. It combines radiocarbon dating, infrared, elemental and isotope analyses, osteology, and experimental cremations to gain new insights into diet, mobility, landscape use, funerary practices, health and demography of past Belgian populations who practices cremations. The initial results of the CRUMBEL project highlight clear differences in diet, mobility and funerary practices for example between the Scheldt and the Meuse basins in the Metal Ages, as well as a clear increase in salt-rich foods during the Roman period compared to the periods before and after. The unique interdisciplinary and diachronic approach of the CRUMBEL project has shown how by contrasting different methodologies with archaeological and historical evidence can help uncovering new information about past populations that practiced cremations.