Traditional place-based diets and their effects on healthy and sustainable food transitions: a systematic literature review

Objective: Traditional diets are culturally accepted and adapted to local environments, but globalisation has shifted towards unhealthy, unsustainable eating habits. This study aims to assess the literature on the effects of traditional, place-based diets on health and sustainability and examines the suitability of common tools used to evaluate them. Design: A systematic search was conducted using the PRISMA 2020 guidelines across seven databases (CINAHL, Cochrane Library, MEDLINE, Scopus, Web of Science, PubMed and Google Scholar), and the protocol was registered with PROSPERO (CRD42023445750). The inclusion criteria were traditional place-based diets, studies examining the nutritional, health benefits and sustainability impacts of traditional food consumption, published in English, with no date restriction. Results: Eleven studies from Spain, Romania, Portugal, Mexico, Chile, Japan, Uganda and India met the criteria. Assessment tools included carbon footprints (via LCA), nitrogen footprints, NRF9.3, Nutri-Score and EAT-Lancet; some incorporated qualitative methods. Mediterranean, Atlantic and Japanese diets aligned well with health and sustainability, whereas meat-heavy or nutrient-deficient patterns raised concerns. Most studies relied on standardised tools and secondary datasets, with limited use of region-specific environmental data or qualitative insights. Only one intervention study was identified. Conclusions: Traditional diets show promise as culturally appropriate models for sustainable and healthy eating. Current tools designed around standardised, reductionist frameworks often fail to capture the complexity of traditional food systems, including local practices, preparation methods and cultural meaning. To better assess traditional diets, future research should develop regionally adapted indicators and integrate quantitative measures with qualitative insights from local communities.