Abstract
Objective
To document and analyze the food systems interventions delivered by community health workers (CHW) serving as educators within the United States (U.S.)
Data Source
Ten databases (ie, Agricola, CAB Abstracts, CINAHL, ERIC, Proquest Social Science and Education, Proquest Theses and Dissertations, PubMed, Scopus, SocIndex, Web of Science) and gray-literature repositories were searched for publications between 2005-2020.
Study Inclusion and Exclusion Criteria
English-language and U.S. studies included with CHW as educators or facilitators for food systems interventions. Food systems defined as processes of production, processing, distribution, marketing, access, preparation, consumption, and disposal of food products. Studies excluded for clinical settings; non-adult CHWs; CHWs with medical or public health credentials; and programming guides, reviews, and commentaries.
Data Extraction
Variables included CHW and intervention description, priority population, food system processes, and targeted and unexpected outcomes.
Data Synthesis
Data were analyzed by the lead investigator and described narratively.
Results
Of 43 records, CHWs educated for consumption (n = 38), preparation (n = 33), and food access (n = 22) to improve health of priority populations. Community health workers educated for the highest number of food system processes in garden-based interventions. Programs reached many underserved racial and socioeconomic populations.
Conclusions
The CHW model has been used to educate in interventions for all food systems processes and reached many diverse underserved audiences. Future work must explore garden-based food systems education and CHWs as community change agents.
Keywords
Objective
In 2010, a coalition of 4 professional organizations in the United States (U.S.), including the Academy of Nutrition and Dietetics (formerly the American Dietetic Association), American Nurses Association, American Planning Association, and the American Public Health Association published a statement defining their shared principles of a community food system. These organizations jointly supported the principles that U.S. food systems should be health-promoting, resilient, economically balanced, transparent, fair, and sustainable. 1 Food systems are defined as: all of the processes involved in getting food from farm to table to disposal, including production, processing, distributing, preparing, marketing, accessing, consuming, and disposing. Food systems also involve people, farms, businesses, communities, interventions, policies, and politics. 2
Sustainable community food systems integrate the processes described above to improve the environmental, economic, and social health of a place and promote equity amongst all stakeholders. 3 Food systems influence public health through food environments and food supply chains to determine how and what types of foods are available to individuals. Diet-related chronic diseases such as obesity, type 2 diabetes, and cardiovascular disease are experienced in disproportionately high rates by marginalized populations such as racial and ethnic minorities and those with low-income. Health disparities in marginalized populations are amplified by food systems that do not equitably serve all communities. 2 Food systems are a critical component of health promotion and public health researchers and practitioners must explore strategies to mitigate health disparities.
Community health workers (CHWs) are public health practitioners who are trusted community members with a thorough understanding of local cultures.
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Community health workers serve as knowledge brokers between subject matter experts and community members in populations at high risk of diet-related chronic disease5-8 by disseminating culturally sensitive education on health behaviors to prevent poor health outcomes.6,7,9-11 The CHW model has been proven to improve individual health behaviors in communities vulnerable to health disparities.7,9,11 While the use of the CHW model is established in public health education,
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this model has not been widely explored in community food systems education. No published review has yet examined the role of CHWs to deliver food systems education to improve public health outcomes. An examination of the CHW model within food systems education is needed given the influence of food systems on public health. The CHW model is a potential strategy to provide education to vulnerable communities in an influential area of health promotion: food systems. The results of this review can be used to plan educational interventions to reach communities marginalized in the current food system who are at high risk for diet-related chronic disease. The purpose of this review was to identify the use of the CHW model as educators in U.S. food systems interventions to inform future inclusive public health food system research and initiatives. The objectives of this scoping review were: 1. To determine the food system processes addressed and populations reached by CHWs serving as educators or facilitators in U.S.- based interventions; 2. To identify and describe the type of food system interventions delivered by the CHW model as an educator, including targeted outcomes and priority populations
Methods
A scoping review was conducted due to the exploratory nature of the research objectives and the overall goal of the paper to provide an overview of the CHW model as an educator within food systems interventions. Scoping reviews allow for identification and description of the evidence within a certain area and permit the inclusion of multiple types of studies and thus the framework presented by Arksey and O’Malley 12 was deemed most appropriate to answer the research objectives of this study. Future systematic reviews may use the results of this study to examine more focused research questions. 12
Food systems are a series of key processes that form a framework of the cyclical food system from farm to fork and include: production, processing, distribution, marketing, access, preparation, consumption, and disposal. 2 Food systems education includes educational efforts that target 1 or more of the 8 key processes. 2 Agriculture education may target food production and nutrition education commonly targets food preparation, consumption, and access. Food systems education, however, encompasses both subsets of agriculture and nutrition education and may promote connectivity among farm-to-fork processes or may equip participants with knowledge to critically assess the implications of engagement within all 8 food system processes. 13 This study is not a comprehensive review of nutrition education or agriculture education delivered by the CHW model, however, nutrition education and agriculture education are components of some food systems education interventions.
Data Sources
Two content blocks (food systems and CHW synonyms) of search terms were applied to ten electronic databases (ie, Agricola, CAB Abstracts, CINAHL, ERIC, Proquest Social Science and Education, Proquest Theses and Dissertations, PubMed, Scopus, SocIndex, and Web of Sciences) and gray-literature repositories to identify records published between January 2005 and December 2020.
Additional Google searches were performed for several gray literature repositories: the American Planning Association Community Health blog, the American Planning Association Community Health reports, reports and issue briefs of the American Public Health Association, Centers for Disease Control and Prevention Stacks, the Johns Hopkins Center for a Livable Future resource collection, National Institute of Health clinical trial registry, and University of California Davis Sustainable Agriculture Research and Education Program resource collection.
The primary investigator (md) conducted a supplemental search using methods modified from Pham et al (2009) 14 in which 20 articles were randomly selected and the reference lists hand-searched to identify additional evidence sources. In addition, the reference lists of all returned reviews were hand searched and additional relevant records were added to the master record file. A secondary search was conducted by (MD) 1 week after the initial search in the Scopus and Web of Science databases using CHW synonyms uncovered in the supplemental search. All searches were executed in December 2020. The full search methodology can be found in Supplementary File 1.
Inclusion and Exclusion Criteria
Population, Intervention, Comparator, Outcome, Timeline, And Setting Framework for Inclusion and Exclusion Criteria of Records for the Scoping Review.
Abbreviation: CHW, Community health workers.
Data Extraction
The evidence selection process used methods adapted from the recommendations of Levac et al. (2010). 15 Titles and abstracts of all returned records were independently screened by 2 co-investigators (MD and MM) and included or excluded by consensus. The full text review and extraction was completed by the first 2 authors using a grouping method in which MM reviewed 100 records and MD reviewed the remaining records. MD and MM independently completed data extraction on records that were included from their grouping of full-text screens. A random sample of twenty records were independently reviewed and extracted, if applicable, by both MD and MM and results were compared to ensure reliability between the groupings. Disagreements at each stage were resolved through discussion between MD and MM and mediated by a third member of the research team when necessary.
Summary of Included Records.
Abbreviation: CHW, Community health workers; BMI, body mass index; SNAP, supplemental nutrition assistance Program; HbA1c, hemoglobin A1c.
Data Synthesis
The extracted data was downloaded from Covidence to a Microsoft Excel file and the lead investigator (MD) analyzed the data for each variable. The descriptions of interventions were reviewed and activities collected in a separate Excel column. Education topics such as dietary recommendations and information about food groups were summarized as an activity labeled “nutrition education.” The dose of the intervention was listed in a column and the intervention setting was classified as home, community, school, work, or faith community. Targeted, secondary, and unexpected outcomes were analyzed by categorizing by general healthy lifestyle behaviors such as diet quality, and by diet-related chronic disease management outcomes such as body mass index (BMI) or blood glucose. The priority population for each intervention was analyzed and categorized using the data by key demographic characteristics such as race, ethnicity, socioeconomic status, and faith community membership. CHW descriptions were categorized by neighbor and then any additional defining traits, such as faith community membership, female, or existing CHW. A chart with each of the 8 food system processes (ie, production, processing, distribution, access, marketing, preparation, consumption and disposal) 2 was created and the targeted processes of each study were tracked so a total count of studies targeting each food system process could be presented.
Results
The search yielded 2594 records and 898 duplicates were removed by the Covidence algorithms. The 1335 records excluded in the title and abstract screening include the count of duplicate records removed manually. The full-text review was performed on 361 records and 43 records were ultimately included. Figure 1 displays the evidence selection process in a visual format adapted from the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. Evidence selection process.
Description of Interventions and Targeted Food Systems Processes
Food System Processes Targeted Within the 43 Included Records.
Targeted Food System Processes of Garden-Based Studies Examined, 2009-2019.
Across all included studies, the most common intervention delivery method was via group sessions.17,19-21,23,25-28,34,39-53 Many classes were participatory and included demonstrations and taste tests.19-21,26,33,34,40-42,45,48,50,52 One-on-one mentoring between the CHW and participants was included in 7 studies18,42-45,54,55 and 6 studies used this approach exclusively.16,22,24,56-58 Multiple studies supplemented group sessions with individualized phone calls or home visits by the CHW to the participant.17,40,42-45,54 Studies also used newsletters, print materials, or videos to deliver intervention messages.20,31-33,40,42,50,51,54,55,57
Description of the CHWs
Several studies recruited individuals to serve as CHWs because of their status as natural helpers, mentors, leaders, or respected neighbors.17,20,26,27,29,39,40,55 Others recruited CHWs for the intervention from existing networks of CHWs, promotoras, or Cooperative Extension Master volunteers.19,38,44,45,47,53,54,56 Two studies used CHWs from occupations not traditionally associated with health promotion: cosmetologists 57 in a beauty salon and supermarket employees in Baltimore. 30 In 4 studies, the CHWs were members of faith communities,25,28,36,49 with Warren et al (2009) 36 describing the CHWs as “lay health ministers.” Nine studies reported that females served as CHWs.5,18,22,35,39,41,47,55,57
Priority Populations
Ten studies reported specific priority populations at risk of or experiencing obesity and/or type 2 diabetes.22,23,27,37,43-46,51 A common priority population was individuals and families with low income.16,17,29-32,35,37,50-53 Racial and ethnic minorities included in study populations were Hispanic,18-20,41,47,53-56,58 Black,22,25,32,33,36,39,49,57 Somali,21,58 Native American,27,40,46 Sudanese, 58 Hmong, 26 Korean, 43 Bangladeshi, 44 and Sikh Asian Indian. 45 Refugees, 24 immigrant families, 58 and migrant farmworkers 34 also participated in studies as the priority audience. Following the inclusion criteria, CHWs shared socio-demographic characteristics with the populations participating in the studies.
Targeted Outcomes
All studies targeted healthy lifestyle behaviors or environmental health outcomes. 38 Increasing markers of diet quality, including fruit and vegetable consumption, was the most common primary targeted outcome.20,21,26,28,31,32,34,36,37,39,42-45,47,49-52,54,55,57,58 Many of the nutrition education efforts also aimed to increase physical activity levels for obesity and diet-related chronic disease prevention.18,26,28,31,36,40,43-45,48,51,53,57,58 A variety of biomarkers were used to assess healthy lifestyles, including weight, BMI, and waist to hip ratio.18,23,25,33,40,43-46,51,58 Diabetes management interventions included biomarkers such as hemoglobin A1c (HbA1c), fasting serum glucose, and lipid parameters.22,44-46 Additional outcomes measured for interventions included food security,34,35,37,52 food safety, 56 food self-efficacy,19,20,48,50,54 participant experience,43-45,53 SNAP enrollment and participation,16,26 screen time,40,51 and health behavior knowledge.40,41
Unexpected Outcomes
Ten studies reported outcomes not included in the project objectives. In a study with Hmong participants, 39 the CHW assisted in additional lesson design and the CHW-led intervention was a noted source of pride for the Korean American community in New York City. 44 Treiber et al (2016) 26 discovered additional training needs of the CHW to continue with effective implementation. Political leaders recruited the Food Justice Leaders of the Tenderloin neighborhood of San Francisco to lobby for health promoting local and state policies. 29 Mental health benefits and physical activity increases were reported by participants in a gardening project designed to increase vegetable consumption. 34 Peer educators working in a farmers market SNAP promotion initiative reported that their participation had increased their own healthy behaviors. 16
Conclusions
The use of the CHW model to provide education on public health issues is well-established.59-62 The food system processes most associated with nutrition education, preparation and consumption, were the most common processes included in the 43 educational interventions. Given that most studies educated only on food preparation and consumption practices, future work should explore how the CHW model can expand educational efforts across a greater number of food system processes. The garden-based studies included in this review had education on the greatest number of food system processes. Gardens allow an opportunity to learn about each food system process and the connectivity of individual processes to the larger food system, often in a culturally relevant manner, as plants and foods important in cultures marginalized in the U.S. can be grown and used in garden-based education for populations commonly reached by the CHW model.63,64
The nutrition education activities included in this review were culturally tailored to priority populations. The results demonstrate that the CHW model can connect individuals to culturally relevant foods through education on food preparation and consumption,17-23,25-28,31-37,39-58 and these CHW-facilitated connections are emerging into food access efforts, evidenced by the 22 included studies with a food access component. However, the limited number of studies that provided education on multiple food system processes beyond preparation and consumption indicates that the CHW model has not been widely used in broad lens food systems educational interventions. Future research could build on included studies with garden-based educational programs that spanned the greatest number of food systems processes, to facilitate connections to culturally relevant foods for underserved populations.
Garden-based programming is a platform from which nearly all of the food system processes can be connected in an educational intervention and is an effective health promotion tool.65,66 The garden-based interventions incorporated 6 of 8 food system processes.35,37 The choices that are accessible within preparation and consumption processes are shaped by the contextual processes of production, processing, distribution, access, marketing, and disposal. 2 Food systems education that spans multiple processes, such as garden-based programming, more fully integrates health promotion into the community and may allow for sustained success in making healthy changes.67,68
The diverse characteristics of the priority populations of the studies included in this review confirms that the CHW model can reach underserved communities who often experience diet related disparities69,70 to provide education on health-related topics. 71 Culturally sensitive modes of educational outreach to populations that experience health disparities must be integrated into efforts to advance equity by reducing health disparities. 72 As health promotion efforts which address food systems issues for underserved communities continue to grow,73-75 the CHW model can be considered a key programming component in these interventions. This review is the first step in understanding how the CHW model has been used to deliver education in food systems to reach underserved communities. The unequal structures and reach of food systems programming for underserved communities was exposed by the Covid-19 pandemic,76,77 and researchers and practitioners must explore strategies that can mitigate health disparities exacerbated by the current food system.
Food systems education to influence individual behavior change can be a tool for health promotion in underserved communities, however, root causes of health disparities must be addressed through interventions that address policies, systems, and environments of food systems and the broader social determinants of health.78,79 This review confirms that the CHW model can connect with underserved communities and identifies how the CHW model has been used as an educator in food systems interventions for public health. Food systems and health promotion researchers and practitioners should prioritize future exploration of the CHW model as community change agents within food system structures. Exploration of CHW as community change agents would support the recommendations of Kumanyika (2019) 72 and Golden & Earp (2012) 80 to incorporate equity into multi-level health promotion interventions. The emergent nature of CHWs educating on 3 or more food systems processes provides researchers and practitioners a blueprint from which to explore the CHW model as an agent in community food system change and a support to social ecological health promotion. Food system researchers and practitioners should continue to explore the CHW model as a tool to deliver garden-based programming to create health-promoting community food systems through educational interventions. Research should extend into an exploration of the CHW model as an advocacy tool for underserved communities and a method of advancement for health and food equity.
Although this review documented the processes of the food system in which CHW have engaged as educators, future work must document how the CHW model can advance equity in food systems. Food systems frameworks that expand beyond the key processes
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used in this review and include considerations for community development and social equity should guide future examinations of the CHW model in promoting community social, economic, and environmental health and sustainability through food systems initiatives. A comprehensive collection of nutrition education and agriculture education records were not included in this review due to the search strategy focus on common food systems terms. Future reviews should utilize a more targeted search strategy to understand the role of the CHW model in these subsets of food systems education. Future systematic reviews of the CHW model within food systems education could include research questions to explore the outcomes of interventions, intervention designs, or preparation of the CHW to deliver the intervention. In addition, future systematic reviews could focus on specific populations so that public health researchers and practitioners can better design culturally sensitive interventions. The scope of the review was limited to U.S. food systems programs. The definition of CHWs employed by the review limited the known scope of practice of CHWs as many CHWs are engaged in activities outside of education and facilitation. Future reviews should explore expanded roles, such as community change agents and advocates, of the CHW model in food systems. The CHW population included in this study was exclusively adults. We included most aspects of a PRISMA scoping review
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in this study, however, we did not assess the study quality or risk of bias in studies given the exploratory nature of the research objectives to understand the scope of educational reach of CHWs within food systems efforts. The review was not registered in a literature review database. Community health workers are proven effective for health promotion education with communities who experience health disparities. Food systems are a key determinant of public health. Strategies for food system interventions are needed to mitigate health disparities. This article documents the use of the CHW model as food systems educators within the U.S. and confirms that the CHW model can reach underserved populations for food systems-related education. The CHW model has not been widely implemented for food systems education beyond preparation and consumption practices. Health promotion researchers and practitioners can use this review as a tool for future research on food systems educational interventions and program planning. The CHW model is a strategy for education to combat health disparities in underserved communities and additional educational interventions should be planned for food system understanding. Food systems educational interventions that include gardening span many food systems processes that, coupled with a CHW model, can promote health in underserved communities. The role of CHWs as community change agents to advocate for health-promoting food systems should be explored.So What?
What is already known on this topic?
What does this article add?
What are the implications for health promotion practice or research?
Supplemental Material
Supplemental Material - A Scoping Review of the Community Health Worker Model Used for Food Systems Interventions Within the United States
Supplemental Material for A Scoping Review of the Community Health Worker Model Used for Food Systems Interventions Within the United States by Maria DeNunzio, Makenzie Miller, Melissa Chase, Vivica Kraak, Elena Serrano, and Sarah Misyak in American Journal of Health Promotion
Supplemental Material
Supplemental Material - A Scoping Review of the Community Health Worker Model Used for Food Systems Interventions Within the United States
Supplemental Material for A Scoping Review of the Community Health Worker Model Used for Food Systems Interventions Within the United States by Maria DeNunzio, Makenzie Miller, Melissa Chase, Vivica Kraak, Elena Serrano, and Sarah Misyak in American Journal of Health Promotion
Footnotes
Acknowledgments
We thank Cozette Comer, Ana Corral, and Ginny Pannabecker from Virginia Tech’s Newman Library for assistance with designing the search strategy and evidence selection process.
Author Contributions
MD and SM designed the study. MD performed the searches and MD and MM completed the data extraction process. MD wrote the manuscript with input from SM. MD, SM, MC, VK, and ES conceptualized the study and provided substantial edits. All authors have read and approved the final manuscript.
Declaration of Conflicting Interests
The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Funding
The author(s) received no financial support for the research, authorship, and/or publication of this article.
Supplemental Material
Supplemental material for this article is available online.
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References
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