Our new transdisciplinary data project builds on previous work, in which we interrogated Caribbean Foodscapes in Jamaica and now also in Haiti. We aim to understand how historical data of Caribbean foodscapes can inform policy and practice for better nutrition and health. We aim to develop cross-disciplinary networks and methods that make use of existing data sources to inform policy action. Data describing food systems – from food pricing, consumption patterns, import rates, land usage to disease trends – are inherently relational and transdisciplinary, and require researchers to cross disciplinary and sectoral boundaries to inform evidence-based policy. As a team of historians and health researchers, we ask how transdisciplinary socio-historical data be systematically assembled to understand the complexity of Caribbean foodscapes, and how we can harness this historical perspective to inform better nutrition and health.