Scoping review of sustainable diets research reveals a thematic and disciplinary emphasis on nutrition and environment

Abstract Sustainable diets have been identified as an important component of a food systems transformation that is urgently needed to meet global sustainability and development goals. This study addresses the lack of a comprehensive synthesis and overview of the sustainable diets literature, including its evolution over time and across disciplines, and sheds light on whether and how this body of work addresses dimensions of sustainability as defined by the Food and Agriculture Organization of the United Nation’s (FAO) sustainable diets framework. Topic modeling, a type of natural language processing, was used to perform a thematic scoping review of 855 articles published between 2000–2022 to identify trends and themes in a way that was rapid, transparent, reliable, and reproducible. This research finds demonstrated growth in the field of sustainable diets research, with the majority (66%) of sustainable diets articles considered in this study published in the last three years of the study period. Sixty-three percent of the sustainable diets research articles can be characterized by two topics, ‘sustainability impacts of dietary patterns’ and ‘sustainable diets and food system policy.’ FAO components of sustainable diets related to local and seasonal foods, culture, and equity receive relatively little research attention, whereas components of health, environment, and food security each align with approximately a third of the research literature. This is also reflected in the subject classification analysis, in which nearly half of the research (44%) was classified as Nutrition and Dietetics and/or Environmental Studies. This research highlights the need for more transdisciplinary research that addresses areas of equity, culture, social processes, and context as well as the intersections of sustainability dimensions to better understand the need for, implications, and directions of sustainable diets to support a sustainable food systems transformation.