The authors of the scoping review conclude that the large number of unique indicators currently used in research creates challenges for stakeholders attempting to identify appropriate measures for sustainable healthy diets.
Röös et al. (2015) published 'Evaluating the sustainability of diets–combining environmental and nutritional aspects' in Environmental Science & Policy, focusing on methods to combine environmental and nutritional metrics.
The term "sustainable diets" was first introduced in the literature by Gussow and Clancy (1986), who argued for the importance of optimizing individual diets for both human health and the protection of natural resources.
Comerford et al. (2020) published the proceedings of a workshop focused on characterizing and defining the social and economic domains of sustainable diets.
The Food and Agriculture Organization (FAO) is committed to accelerating progress on achieving sustainable healthy diets by coordinating research and collaboratively building an evidence base.
Ninety-five articles, representing 92% of the sample in the scoping review, assessed the sustainability of diets using environmental indicators.
A 2019 review by Eme et al. examined methodologies for assessing sustainable diets and explored the potential for developing harmonized indicators.
The start date for the literature search (January 2010) was chosen based on the year the definition of sustainable diets was published by Burlingame and Dernini (2012).
The 16 guiding principles of sustainable healthy diets are intended to provide flexible guidance to countries for policy and program implementation while accounting for different local contexts.
Cultural acceptability in the context of sustainable healthy diets is most frequently measured as a minimal departure from the current diet.
In a scoping review of indicators for sustainable healthy diets, 32% of the articles assessed diet sustainability using sociocultural indicators.
Meybeck and Gitz (2017) examined the integration of sustainable diets within sustainable food systems in the article 'Sustainable diets within sustainable food systems' published in Proceedings of the Nutrition Society.
Burlingame and Dernini (2012) defined sustainable diets as diets that are protective and respectful of biodiversity and ecosystems, culturally acceptable, accessible, economically fair and affordable, and nutritionally adequate, safe, and healthy, while optimizing natural and human resources.
The selection of indicators for measuring the sustainability of diets involves inherent tradeoffs between completeness and simplicity.
Clear indicators and methods for measuring sustainable healthy diets are required to build an evidence base for guidelines and policies and to monitor progress toward national and subnational targets.
The primary barriers to accelerating progress toward sustainable healthy diets include a persistent geographical imbalance in research, a tendency to overlook sociocultural aspects, and a lack of common definitions and metrics used in research.
Quantifiable indicators for sustainable healthy diets are critical for understanding current trends, setting targets, and monitoring progress at national and sub-national levels.
The authors of the scoping review suggest that measures registries could provide the necessary decision-support for stakeholders to select appropriate indicators for sustainable healthy diets.
The scoping review mapped indicators used to assess the sustainability of diets across the 103 included articles to three main aspects: health, environmental, and sociocultural.
In the scoping review, 14 articles (14% of the sample) offered alternative definitions of sustainable diets, which often focused on health and environmental aspects while neglecting the sociocultural aspect.
Research on the sustainability of diets shows a disproportional amount of focus on environmental and health aspects, with a high degree of heterogeneity in the indicators used across studies.
The authors of the scoping review defined 'concepts' as the abstract phenomena or ideas being studied, and 'indicators' as the quantitative or qualitative measures used to communicate information about those phenomena or ideas.
The compilation and categorization of existing indicators of sustainable healthy diets reported in peer-reviewed literature were conducted between March and August 2020.
Operationalizing the 16 guiding principles of sustainable healthy diets requires that the values within the principles correspond to measures capable of analyzing trends, setting targets, and monitoring progress at national or subnational levels.
The study 'Healthy and sustainable diets that meet greenhouse gas emission reduction targets and are affordable for different income groups in the UK' was published in Public Health Nutrition in 2019.
Reynolds et al. (2019) authored research regarding sustainable diets, though the specific title is truncated in the source text.
Monterrosa et al. (2020) investigated sociocultural influences on food choices and their implications for sustainable healthy diets in the article 'Sociocultural influences on food choices and implications for sustainable healthy diets' published in Food and Nutrition Bulletin.
Burlingame and Dernini (2012) authored 'Sustainable Diets and Biodiversity Directions and Solutions for Policy, Research and Action', published by the FAO Headquarters in Rome.
Mayton et al. (2020) conceptualized sustainable diets in Vietnam by identifying minimum metrics and potential leverage points in the study 'Conceptualizing sustainable diets in Vietnam: minimum metrics and potential leverage points' published in Food Policy.
Luckett B. G., DeClerck F. A., Fanzo J., Mundorf A. R., and Rose D. (2015) published 'Application of the Nutrition Functional Diversity indicator to assess food system contributions to dietary diversity and sustainable diets of Malawian households' in Public Health Nutrition.
The Food and Agriculture Organization (FAO) is developing a compendium of indicators for sustainable healthy diets to serve as a decision-support tool for researchers, evaluators, and policy makers.
The scoping review mapped all identified indicators to one of three main aspects used to define sustainable healthy diets: health, environmental, and sociocultural aspects.
Perignon et al. (2019) conducted an optimization study to identify more sustainable diets in Tunisia that meet nutritional recommendations while reducing environmental impact in the article 'How to meet nutritional recommendations and reduce diet environmental impact in the Mediterranean region? An optimization study to identify more sustainable diets in Tunisia' published in Global Food Security.
The authors conducted a scoping review of empirical studies to describe how sustainable healthy diets are defined and measured in research literature, specifically addressing how they have been defined since 2010 and what range of indicators is currently in use.
In a scoping review of indicators for sustainable healthy diets, 75 articles (72% of the sample) assessed the health aspects of diets.
In a scoping review of indicators for sustainable healthy diets, 42% of the articles assessed diet sustainability using both health and environmental indicators.
Jones et al. (2016) conducted a systematic review of the measurement of sustainable diets.
In the scoping review, 60 articles (58% of the sample) did not explicitly define sustainable diets.
The authors utilized a modified scoping review design, as described by Peters et al. (2015), to synthesize evidence on sustainable healthy diets because scoping reviews are effective for mapping and charting heterogeneous data sources.
The scoping review identified 59 sociocultural indicators for assessing the sustainability of diets, categorized into concepts including cultural acceptability (10), animal welfare (3), satisfaction (3), attitudes (1), food security (1), cost of diets (24), environmental costs (7), health costs (4), productivity costs (1), and other (5).
Kramer et al. (2017) investigated how to find healthy and sustainable diets with limited changes to decrease the overall environmental impact of the Dutch diet.
A widely accepted definition of sustainable diets coined in 2010 states: "Sustainable diets are those diets with low environmental impacts which contribute to food and nutrition security and to a healthy life for present and future generations."
In a scoping review of 103 articles, 28% of the studies referred to or cited the 2010 definition for 'sustainable diets'.
The criteria used to select indicators for sustainable healthy diets can (1) aid in the establishment of a shared process and vocabulary for stakeholders, (2) reinforce the linkage between indicators and the evaluation or research questions being addressed, and (3) help in the design, collection, storage, and retrieval of data linked to intended uses of findings, according to MacDonald (2013).
In a scoping review of indicators for sustainable healthy diets, less than 25% of the articles assessed diet sustainability across health, environmental, and sociocultural aspects.
Previous literature reviews by Jones et al. (2016) and Eme et al. (2019) partially examined measurements of sustainable diets but failed to investigate how researchers defined the concept or report on the strengths and limitations of proposed measures.
The lack of common measures for sustainable healthy diets makes it difficult for researchers, evaluators, and policy makers to compare study results across time and place.
Food waste indicators can be categorized as measures of the environmental aspect of sustainable healthy diets, but they may also illustrate phenomena related to food safety (health aspect), social norms and consumer attitudes, or economic constraints (sociocultural aspect).
A scoping review of 103 empirical articles published between January 2010 and February 2020 found that 57.3% of these articles were published after 2017.
In a scoping review of 103 empirical articles regarding sustainable healthy diets, 74% of the studies were conducted in high-income countries.
In the scoping review, 29 articles (28% of the sample) referred to or cited the 2010 definition of sustainable diets.
Mason P. and Lang T. (2017) authored the book 'Sustainable Diets: How Ecological Nutrition Can Transform Consumption and the Food System,' published by Routledge in New York.