Role of the Food Supply Chain Stakeholders in Achieving UN SDGs

: This paper gives an overview of main food supply chain stakeholders and their role in achieving the UN Sustainable Development Goals (SDGs). As this supply chain is global, playing a signiﬁcant role in feeding the world, a deeper analysis of 17 SDGs, their targets and indicators reveals numerous direct and indirect connections with various SDGs. To perform such an overview, the authors investigated the link between the main stakeholders of the chain (farmers, food processors, food traders and consumers) with UN SDGs. In parallel, the authors explored the roles of policymakers, inspection services, certiﬁcation bodies and academia in supporting these SDGs. In spite of numerous papers, calculations and estimations, discussion and media coverage, the authors believe that only the tip of the iceberg has been revealed. Based on this overview, the authors emphasize SDG 2—Zero Hunger and SDG 12—Responsible Consumption and Production as the most dominant for the food supply chain. In parallel, the achievement of SDG 17—Partnerships for the Goals will enable deeper intertwining of the goals and all stakeholders in the food supply chain continuum. Additional efforts are needed to pave the way for fulﬁlling the targets of the UN SDGs and exceeding expectations of all stakeholders.


Introduction
In 2015, the United Nations adopted the 2030 Agenda for sustainable development to end poverty and achieve sustainability worldwide. This 15-year plan consists of 17 Sustainable Development Goals (SDGs) with a list of 169 SDG Targets, and progress towards these Targets are to be tracked by 232 unique Indicators [1]. Since the adoption of the SDGs, many discussions have been raised regarding the role of food systems due to its high contribution to society, economy and environment. In July 2021, a Food Systems pre-summit took place in Rome with participants from 190 countries (both in person and virtual) and outlined national pathways to address multiple aspects of food systems in relation to UN SDGs "based on the best science and reflecting local and national realities within a global context" [2]. In September 2021, the UN Secretary-General António Guterres will convene the Food Systems Summit as part of the Decade of Action to achieve the Sustainable Development Goals (SDGs) by 2030. The Summit will launch bold new actions to deliver progress on all 17 SDGs, each of which relies, to some degree, on healthier, more sustainable and equitable food systems [3].
This opens a wide perspective for economists, scientists, academia and food industry stakeholders to recognize their role in achieving the SDGs. Deeper analysis of the SDGs, targets and indicators shows that food systems have more indirect than direct connections, as eight SGDs are in direct correlation with the food, as reported by the Food and Agriculture Organization [4]. Nevertheless, limited attempts have identified the role of food systems in achieving the UN SDGs from a holistic food supply chain perspective.

Farmers Policymakers and governments Food processors
Inspection services and certification bodies Food traders Scientific community Food consumers Other: NGOs and media The objective of this paper was to provide an overview of the main primary and secondary stakeholders in the food supply chain and how they are related with the UN SDGs. More specifically, we connected UN SDG targets with primary stakeholders (Section 2), and further deployed impacts of farmers, food processors, food traders and food consumers on achieving UN SDGs (Section 3). Section 4 provides an insight on how policymakers and governments, inspection services and certification bodies, the scientific community and other secondary stakeholders affect UN SDGs from a food perspective. Finally, we graphically depicted the food supply chain in terms of main facts and figures and UN sustainable development goals.

Materials and Methods
In order to perform an overview on connecting UN SDGs and the key stakeholders of the food systems, at first glance, it was obvious that a literature review with various combinations of different key words (food production/food systems/food supply chain) in various scientific databases will raise different results (i.e., in ScienceDirect search engine for "food production and UN sustainable development goals", over 15,000 results were reported, and for "food systems and UN sustainable development goals", over 20,000 results were also revealed). As this topic is heterogeneously dispersed through various scientific publications (research and review articles, book chapters, conference papers, editorials, etc.), the authors focused attention of this overview on specific UN SDGs to enlighten the connection between the goals and links in the food supply chain.
To specify the goals of interest, the co-authors of this paper participated in a session by ranking relationships between UN SDGs and four main links of the chain using the Delphi method to stimulate and synthesize the opinions of these experts. We used a simplified thematic analysis approach using the following steps: (i) familiarization with UN SDGs/targets; (ii) define direct/indirect codes; (iii) analyze targets and (iv) assign codes [15].
The Delphi session was organized online (due to the travelling restrictions caused by the COVID-19 pandemic) and the authors of this paper gave their opinion on the type of connection of targets with stakeholders with the aim to reach consensus. All 169 targets have been analyzed in terms of their direct or indirect connection with one of the four stakeholders of the supply chain. If no connection was observed, the target was categorized as "other". The Delphi method is often used to elicit experts' knowledge and achieve consensus [16]. The results of such an analysis are depicted in Figure 1. The outcome shows that 52 targets are directly (12) or indirectly (40) connected with the food supply chain (Supplementary Material). There were no holdouts for any of the targets. Authors confirmed that all targets have been adequately assigned for each actor in the food supply chain. This figure served as a tool in classifying articles and performing this overview. Herrero et al. [5] had a different approach and analyzed the connection of 232 indicators with eight UN SDGs clearly outlined by the FAO [4] as opposed to the remaining nine UN SDGs.

Impact of Farmers on Achieving UN SDGs (and Vice Versa)
Agricultural practice, as the first link of the supply chain, plays a crucial role to meet the food demand of a growing global population. While food production tripled between 1960 and 2015 due to land expansion and intensification, it has caused (severe) environmental impacts. Food production uses 70% of the freshwater withdrawals and about 40% of land and is responsible for about 23-33% of the global GHG emissions [17][18][19]. Hence, the challenge remains on how to produce in a sustainable way-by enhancing resource-use efficiency (SDGs 6, 12, 14, 15) and mitigating/adapting to climate change (SDG 13)-in order to achieve global food security (SDG 2) and improve the livelihood and well-being of farmers (SDGs 1, 2, 3), especially of smallholders, who produce about 75% of all food [20].
In this regard, the FAO [21] states the need to transform current agricultural systems towards a more "holistic" food production systems, such as agroecology, climate-smart agriculture and conservation agriculture. This transformation has multiple effects on the SDGs. For instance, Arouna et al. [22] reported higher yields for new varieties of rice, which increased the income (SDG 2; on average, USD 3.9 per year per capita) and reduced poverty (SDG 1; between 18% and 24%) of small-scale farmers in sub-Saharan Africa. However, the level of adoption of changes in farming practices has been lower than the ones needed to achieve food security, according to Thornton et al. [23], who evaluated the state of the changes in agricultural practices of 6300 smallholders in 21 countries. Technological improvements in agriculture also pave the way for ensuring food security associated with SDG 2, such as the design of a smart honey supply chain that improved food security and food safety, and reduced honey fraud [24]. This smart agricultural system was based on blockchain technology.
Transforming farming systems is also crucial to take action on climate change (SDG 13). Food production is an important contributor to greenhouse gas (GHG) emissions, and enhancing its efficiency can reduce 40% the GHG emissions per food produced [25]. In addition, farmers must adapt to current changing climate effects such as variations in mean temperatures, global water cycles associated with modified precipitation patterns and occurrence of extreme weather events [26]. Climate change can reduce 70% of crop yields by 2030 [27], and therefore, adapting to climate change is needed to enhance food security (SDG 2) and reduce poverty (SDG 1) among small-scale farmers [28,29].
Land access and ownership is a fundamental factor for farmers to decide on changing their agricultural practices. Charoenratana and Shinohara [30] stated that "farmers' increased land stability will raise confidence to invest in the land and a wider variety of professional opportunities that will produce enough to allow stable food security of farming households". Hence, they concluded that land security has a crucial role to improve food security. In this regard, Villano et al. [31] also reported the relationship between land access and higher productivity in livestock and crop-livestock farming systems in Ghana; Rashid [32] found a positive correlation between land tenure security, agricultural credit and rice productivity in Tanzania. In addition, the access to land and other resources are key factors to achieve gender equality (SDG 5) in farming systems, as only 5-30% of the cultivated land is owned by women in developing countries [33].

Impact of Food Processors on Achieving UN SDGs (and Vice Versa)
To achieve sustainability, food processors should transform their conventional food processing systems through designing resource-efficient innovations and minimizing residues by promoting reusability and material recycling. One focus should be on clean water and sanitation (SDG 6). Food processing is an important stage of the food supply chain that requires high-quality (potable) water [34]. Water is either used as an ingredient for production or for cleaning and sanitation as a main prerequisite in good hygiene practice programs [35]. Moreover, there are many types of wastewaters in food processing, and many challenges that can be accomplished by innovative nonthermal technologies, used to oxidase and decontaminate water to be used afterwards. Such water is dependent on pollutant loadings from food/food processes with wastewater treatment in place [35].
Concerning affordable and clean energy (SDG 7), food processing should use renewable energy sources. In addition, food processing can indirectly impact the industry, motivation and infrastructure (SDG 9), with digitalization, optimization and innovation of the food processing industry, including Industry 4.0 and the establishment of high quality and efficient infrastructures. By efficient planning, optimization and digitalization, resource use can be reduced along the whole food supply chain, productivity and employment can increase and food systems can benefit from value addition. The combination of achieving targets set in SDGs 2, 6 and 7 represent three sectors that are very closely linked with the water-food-energy nexus [4].
Concerning responsible consumption (SDG 12), innovation towards more sustainable food packaging can extend the shelf life of fresh produce, and, subsequently reduce food waste [36], and the associated environmental and economic cost. Food processing is key in achieving food safety and in obtaining safe products. Some researchers propose the application of nonthermal and advanced thermal processing as a tool to assure food safety by using safe, green, clean and energy efficient technology [37,38]. Those smart and efficient productions will end in smart factory production, smart land use for bio production [39] and with low GHG emissions that impact climate change (SDG 13). Augustin et al. [40] identify the critical role of food processing in food and nutrition security (SDG 2), striving towards sustainable diets (SDG 12) and reducing food losses (SDG 12) for achieving resource use efficiency (SDGs 6, 7).

Impact of Food Traders on Achieving UN SDGs (and Vice Versa)
Food traders play a key role in ensuring that safe and healthy food is accessible and affordable (SDGs 2, 3). Considering the fact that more than 50 million people will be undernourished by 2050 due to climate change (SDG 13), the present international food trade practice needs to be modified [41]. Climate change directly influences regions and food production modifying trade patterns [42]. Although climate change increases the role of trade in reducing the risk of hunger (SDG 2), it does not always provide optimal options in terms of types of food traded. Therefore, promotion of changing (reducing) tariffs and all kinds of institutional and infrastructural barriers may decrease the negative impact to over 20 million undernourished [41].
Climate change also has an impact on transportation systems, causing delays, rerouting and re-scheduling, reduced speed, pressure on tires, stress on infrastructure/vehicles, road/railway closures and vehicle instability [43]. Connection of food transportation and climate change highlights the need for reducing GHG emissions from the vehicles as well as the promotion of low carbon fuels (SDG 7) striving towards climate friendly transportation policies [44]. This may be connected with SDG 9, highlighting the need for building sustainable infrastructure as well as combating climate change (SDG 13).
Comparing the sustainability of local vs. global food systems is complex. Several studies (i.e., Coley et al. [45]) have used the concept of "food-mile" and linked it with climate change (SDG 13). Food-mile is calculated as distance that a certain type of food travels from where it is grown/raised to where it is purchased by the consumer and/or end user. It takes into account all raw materials, their quantities, locations where they were grown/raised, distance to the food producer as well as transportation of the final product to (all) traders [46]. In most cases, imported foods do not emit higher GHG emissions than local food products, but this might depend on the selected environmental impact, such as reported by Payen et al. [47]. In this regard, Farmery et al. [48] highlights the inadequacy of this food-mile concept as a sustainable metric, and Schmitt et al. [49] concluded that the health and socio-economic dimensions are the key ones for local products, after comparing the sustainability of 14 local and global foods, considering five dimensions (environmental, economic, social, health and ethics).
Some food commodities require cold chains associated with maintaining optimal time/temperature ratio during transportation involving specific trucks and refrigerants [50]. Climate change impact linked with food trade is associated with the use of refrigerants needed in cold chains as this is important for achieving prescribed food safety levels [51,52]. These impacts clearly identify a need for climate action (SDG 13) associated with GHG emissions and ozone layer depletion linked with storage/retail [53]. One approach is shifting from hydrofluorocarbon refrigeration systems to systems with lower impact on climate change, in line with the EU legislation [54]. In addition, a simulation of sustainability of perishable food supply chains revealed that perishability of food may increase various environmental impacts up to 120% [55]. However, good storage practices in terms of industry innovation (SDG 9) have potential in combating climate change (SDG 13) [56]. Internet of Things as a concept (SDG 9) enables better transportation traceability and monitoring as well as optimizing energy consumption (SDG 7) and GHG emissions (SDG 13) [57].
Traders can take advantage of different types of food labels to communicate and promote healthy food products in their commercial establishments. International ISO standards present environmental labels as "claims which indicate the environmental aspects of a product or service" [58] with the possibility to communicate environmental information at different levels and different formats [59]. Environmental labels (aligned with food labels as mandatory legal requirements) must consider all relevant impacts of a product's life cycle and use a reliable and verifiable evaluation method. However, going one step further and aligned with the SDGs, information of products should not be only environmental but also provide social and potentially economic benefits (Figure 2). For the sake of simplicity, we will call it here as "sustainable labelling". In this sense, there are a huge number of organizations, promoted by groups of producers, retailers, nongovernment organizations or public authorities, that have developed their own voluntary sustainable labelling schemes to provide information to consumers about certain aspects of the food they buy or its production method [60]. In all of them, there are four common goals: (1) they provide information that consumers otherwise might not have; (2) they provide information in a format that is understandable and quickly comprehensible for most consumers; (3) its use and the verification system behind foster trust of consumers; and (4) they empower consumers. The labels allow consumers to express their individual value perception of product characteristics. Consumers can compare different product quality attributes and which characteristics they prefer [61]. In this sense, it is worth mentioning a couple of recent labels that have appeared in the European market: Nutri-Score, combining nutritional and health issues, and Eco-Score, showing the environmental impact of food (SDG 6, 7, 13); both of them bring added values to food choices (SDG 12) [62]. All the above-mentioned labelling programs, from ISO standards to the most recent Eco-Score and Nutri-Score, aim to encourage food choices associated with lower environmental impact and responsible consumption. The vast availability of schemes developed [63] have increased market-based incentives for environmentally friendly products and production processes.

Impact of Food Consumers on Achieving UN SDGs (and Vice Versa)
As defined by the FAO, "sustainable diets are those diets with low environmental impacts which contribute to food and nutrition security and to healthy life for present and future generations. Sustainable diets are protective and respectful of biodiversity and ecosystems, culturally acceptable, accessible, economically fair and affordable; nutritionally adequate, safe and healthy; while optimizing natural and human resources". Hence, they affect several SDGs (i.e., 2, 3, 12-15), but the world is far from attaining sustainable targets related to diets. In 2019, 60 million people went hungry in 5 years, 9% of the global population (690 million people) was undernourished (840 million by 2030, if no changes take place) and two billion people (30% of the global population) experienced hunger or had irregular access to nutritious and sufficient food [64]. In addition, the FAO related the prevalence of hunger with the low affordability of healthy diets, reporting that 3 billion people cannot afford the cheapest healthy diet.
Food consumption patterns also contribute to health (SDG 3) and climate change (SDG 13). With higher incomes and urbanization, global food consumption patterns shift to diets with higher intake of animal-based products, processed and sugar-sweetened beverages, which are related to overweight and obesity, and higher GHG emissions. If this trend of global dietary transition prevails, the GHG emissions related to the production of these diets will increase 80% of food production by 2050 [65].
In the past 5 years, a large amount of literature has reported the environmental benefits of adopting healthy and sustainable diets (i.e., [66][67][68][69]), showing that dietary shift is a key strategy for climate action. Still, the pressure on changing dietary habits as a result of mainly environmental impacts is more explored in scientific models than observed in everyday life [50]. Therefore, the fundamental question remains on how to encourage people to adopt sustainable diets (SDG 2, 3, 12, 13).
The availability and accessibility of food to daily life of people, known as food environments (FAO, 2016), are key to determine food choices and, ultimately, consumers' diet quality [70]. Home or community vegetable gardens can be also an important action to combat malnutrition (SDG 2) by improving diet quality [71,72], as well as to achieve sustainable cities and communities (SDG 11) and better well-being of citizens (SDG 3) [73].
A case study on transportation of bread in UK promotes walking/cycling associated with consumers who need to buy bread from local bakeries as one of the main sustainable strategies associated with sustainable cities (SDG 12) and climate change (SDG 13) [74]. The rationale is behind the fact that an average shopping travel distance is above 750 km/year/household, with two-thirds of travelling carried out using a car.
Food loss and waste (SDG 12) occurring along the whole supply chain plays an important role in achieving sustainability and food security (SDG 2). For instance, Abbade [75] estimated that all the food lost globally could have fed 940 million adults in 2017. While it has been usually considered that household food waste is a key contributor in high-income countries [76], the FAO [77] recently reported that it is a general issue across all countries. Hence, understanding the social habits (i.e., food purchasing and kitchen management) and raising knowledge among household members are key actions to reduce food waste [78]. An interesting study was performed in the UK, pointing how developed countries deal with surplus food distribution as a tool to feed the hungry [79]. In spite of good will, the study revealed that a lack of legislation associated with food donation was an obstacle that cannot be ignored. A review of Lemaire and Limbourg [80] shed new light on existing approaches in reducing food loss and waste by highlighting the necessity of awareness raising among all stakeholders, and revealing needs for redesigning current and developing integrated supply chain models of redistribution, recovery and disposal. All presented efforts align with the need for achieving SDGs 2 and 12 and combating climate change (SDG 13).

Policymakers and Governments
Policymakers and governments are key moderators that can impact food supply chains and set rules and legislation to achieve sustainable development. There are networks and collaborative frameworks that exist in the world that can impact food system transformation, such as the global urban agreement of Milan Urban Food Policy Pact or the upcoming UN Food Systems Summit. Such initiatives recommend key activities to accelerate the transition to sustainable food systems. These frameworks are primarily intended for national or local government departments. However, the integration of sustainability (and its goals) into food policy is a challenge [81], as it is hard to identify all policies due to food system complexity [6]. Moreover, Kanie and Biermann [82] highlighted that applying the SDGs within policies is "governing through goals", and countries can voluntarily report their achievements and no binding obligations are required [7]. Hence, this makes it difficult to analyze how the SDGs are implemented in domestic politics, and little research has assessed the level of integration. In this regard, only the article of Siegel and Bastos Lima [7] tackles this issues by evaluating how SDGs are included in policies of three South American countries (Brazil, Paraguay and Uruguay). Besides, only 47 countries worldwide have published the Voluntary National Review (VNR) on their level of achievement of SDGs [83]. A bottom-up approach in analyzing UN SDGs from a poultry food supply chain perspective in Brazil revealed obstacles such as environmental legislation not aligned with the SDGs, as well as diversity of business models applied, difficulties in measuring supply chain impacts and different engagement of the stakeholders [84].
National governments are responsible for establishing institutions and designing and implementing policies at the local or national level to develop food systems in line with national objectives and goals. Different stakeholders (e.g., civil society, private companies, research institutes, etc.) can help implement these policies and support governments in advancing a systemic transformation. All authorities should act as partners in improving processes and aligning the food supply chain to the motivation of achieving SDG 17. There is also a need to set better efforts in coordination with actors and integrate sustainability policies with other relevant ones in the food systems agenda (security, transportation, small and medium size enterprises, producers, etc.) at different levels, international to local [85].

Inspection Services and Certification Bodies
Different standards exist in the agribusiness sector, with mandatory requirements and related compliance procedures. These procedures can address aspects such as guidance on agricultural practices, requirements and standards for equipment supporting agricultural activities, seeds, plants, animal feeds, etc. Quality infrastructure (QI) and its impact on the Sustainable Development Goals (SDGs) is important in standardization, metrology, accreditation, testing, certification and inspection services. This quality infrastructure is fundamental in supporting this transformation to sustainable industry, smart processing and smart industry. The correct application of these standards ensures that food is fit and safe for consumption, which in turn allows people to live healthy lives and improve their social and economic well-being. An overview of technical committee ISO/TC 34 "Food products" [86] shows that this committee declares contributing to SDGs (SDGs 1, 2, 3, 5, 8, 10, 11, 12, 13, 15 and 16) with published food-related standards.
Food safety standards such as Codex Alimentarius linked with good hygiene practice [87] and food safety management standards such as ISO 22000 [88], BRC [89] or IFS [90], along with various certification schemes outlined by the Global Food Safety Initiative (GFSI) [91], play a role in ensuring the health, safety and quality of food products. Production and distribution of safe food worldwide is directly linked to SDGs 2 and 3 but may also align with SDGs 9 and 12 [86]. However, the latest survey on the number of certified ISO 22000 companies worldwide shows below 35,000 issued certificates in less than 40,000 production sites [92]. Besides these standards, the implementation of environmental management systems (EMS) such as ISO 14001 [93] brings benefits in terms of aligning the life-cycle assessment approach (LCA) with SDG 13 [94]. This approach has emerged as an essential and widely recognized framework to understand and measure mainly environmental attributes but can be deployed to social and economic attributes of a product, material or process [95]. The LCA framework has been adopted by several familiar declarations, certifications, standards and regulatory requirements [96]. However, data show that below 0.5% of all certified EMS worldwide belong to the first two links of the supply chain-farming and food processing [92].
There are many inspection services and certification bodies in the world that provide laboratory testing, system certification, inspection and audit services against various standards. Their assessment are aligned with different conformity assessment standards such as ISO 17021 for bodies providing audit and certification of management systems [97] or ISO 17025 for laboratories [98]. Certification services cover quality, environment and safety management systems in sustainable development, food and green products, information technology as well as product certification and service certification.
When it comes to sustainability, there are numerous tools and approaches enabling greater awareness of sustainability importance and development, with corporate social responsibility (CSR) practice as the most recognized [99]. It promotes sustainability reporting using guidelines outlined by the Global Reporting Initiative (GRI) [100]. These guidelines (standards) are voluntary and refer to sustainability pillars-an organization's economic, environmental and social impacts [101]. Food companies reporting their indicators may strive towards efficient use of natural resources and reduction of environment impact [102]. Big corporations outline their connection with UN SDGs in their CRS reports such as Nestle [103]. Besides this, other sustainability assessment tools may help in calculating and reporting such as carbon and water foot printing, corporate sustainability reporting, sustainable claims support and sustainable packaging and evaluation, as promoted by some certification bodies [104]. In order to address global task to reduce greenhouse gas (GHG) emissions, governments, investors, stock exchanges and organizations have implemented reporting requirements and are pressuring businesses to reduce emissions throughout their value chain [105]. The approach is based on GHG protocols [106]. GHG emissions validation and verification may be used by food producers for a number of reasons, such as to contribute to their annual report, communicate to their customer, meet regulatory or investor reporting requirements or publicly disclose their emission reduction achievements. Independent validation and verification of GHG emissions for food organizations should comply with guidance aligned to ISO 14064 standards [107].

Scientific Community
The scientific community influences the education of food engineers and technology experts in sustainable development. More efforts are needed to ensure that research, education and scientific public communication are in line with sustainable development goals. The aim is setting directions and action lines for research projects to tackle some sustainable development goal and indicators. Universities play a key role in providing education that goes in accordance with sustainable development. In this regard, Kioupi and Voulvoulis [108] developed a framework to assess the alignment of 40 UK and European master's programs (related to environment and sustainability) to the SDGs. They reported the lack of some aspects (i.e., health, well-being, among others) within these educational programs and highlighted that universities must be aware of their contribution to sustainable development. Chaleta et al. [109] assessed the implementation of the SDGs in 187 undergraduate courses of the School of Social Sciences at the University of Évora, but no studies have specifically focused on food systems.
On the impact of sustainable development, a lot of efforts are needed to educate professionals to become sustainable food engineers and technologists, highlighting the need to impact SDG 4 and ensure inclusive and equitable quality education and promote lifelong learning opportunities for all. Education for SDGs with learning objectives are key facts to educate on different levels to form a generation of sustainability-oriented, green-thinking responsible citizens.

Other Stakeholders
Media has both a global and local role in communication toward consumers and other stakeholders in the food supply chain, where the impact of social media is increasing [110,111]. Regarding the UN SDGs, the United Nations launched their Media Compact campaign, including 100 members reaching to an audience of about 2 billion people in 160 countries across five continents, mainly by disseminating facts, stories and solutions [112]. For the food supply chain, the main focus of the media should be on SDGs 12, 13 and 17 with instructions, examples and success stories that each individual can relate to. Academia, though its interdisciplinary, inter-institutional communication with support of the media, can build a better future and assure safe, healthy and sustainable food processing and production. Besides media, NGOs also play a role in achieving their commitment "to leave no one behind", promoting the practical contributions of civil society in achieving UN SDGs, as agreed by more than 100 contributors [113].

Practical Implications and Future Steps
This overview provides a new perspective on the role of primary and secondary stakeholders of the food supply chain in fulfilling UN SDGs. Although a certain amount of attention is given to the correlation between UN SDGs and food supply chains, their deployment to specific goals on a global level or to specific food sectors is still at a low to moderate level in terms of their acknowledgement and food-sector application. Despite the considerable attention paid to some UN SDGs ("Zero Hunger", "Responsible Consumption and Production" and "Climate Action"), the majority of other directly or indirectly related UN SDGs are still under the radar and few studies have integrated all of them in a holistic approach. Our findings specify focus points for both primary and secondary stakeholders enabling better understanding of the intertwining of UN SDGs and food supply chains. Elevating the perspective to countries, it is obvious that developing countries have different challenges compared to the developed countries, and therefore, national strategies are diverse, as outlined during the 2021 Food Systems Pre-Summit held in Rome in July 2021 [2].
Results of this study provide a new dimension for managers, agronomists, food technologists, food traders and environmental/sustainability scientists in understanding their impacts on UN SDGs engaged in the supply chain. Key points of the discussion can also be helpful to other stakeholders such as academia or policymakers who intend to further explore potential means of supporting the achievement of UN SDGs. In parallel, they can assist in decision-making and/or recommendations when mitigation strategies need to be employed.
Similar to the existence of guides associated to good hygiene and/or manufacturing practices throughout the food supply chain published either as standards [87] or legislation [114], the authors believe that similar guides for the UN SDGs should be developed in the near future. All the theoretical background should be deployed in three main directions: (i) guides for fulfillment of each of the 17 UN SDGs applicable in the food supply chain; (ii) guides for specific food sectors such as meat, dairy or cereal chains, (iii) special attention should be put on drafting simple guides for small and medium-sized enterprises.

Concluding Remarks
Food systems are crucial in achieving the UN SDGs, and previous studies mostly focused on the contribution of food systems to SDG2. In this regard, the novelty of this overview is to give attention to the key stakeholders and discuss their influence on the achievement of all SDGs, directly or indirectly. Figure 3 summarizes all these contributions, as discussed in the previous sections. In addition, the interlinkage between the different actors is based on strengthening partnerships for the goals (SDG 17). Considering all actors, the system tackles all SDGs, but the most prevailing goals are the SDGs 2 and 12. This is not unexpected, since they are the two key food-related SDGs. This study has two main limitations. The first is the fact that it was not written as a review paper, but rather as an overview providing insight from both literature and expertise of the authors. The second limitation is the fact that approaches of other scholars towards UN SDGs are very picturesque in terms of creativity and approach, so some of these ideas have not been included in this overview. A key challenge of this study was the lack of data on the level of achievement of the SDGs, and most difficult was relating it with different stakeholders. In this regard, the FAO recently published some indicators, since it will be the responsible body to report on the 21 SDG indicators of SDGs 2, 5, 6, 12, 14 and 15 [119]. Nevertheless, further investigation is needed to assess the current impact of stakeholders on SDGs, as well as the potential effect when implementing innovations in any step of the food supply chain. This will allow us to set action lines and work together to achieve the SDGs.