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In rural Native American communities, access to healthy foods is limited and diet-related disparities are significant. Tribally owned and operated convenience stores, small food stores that sell ready-to-eat foods and snacks primarily high in fat and sugar, serve as the primary and, in some areas, the only food stores. The Tribal Health and Resilience in Vulnerable Environments or “THRIVE” study, implemented between 2013 and 2018, is the first healthy retail intervention study implemented in tribally owned and operated convenience stores. THRIVE aims to increase vegetable and fruit intake among Native Americans living within the Chickasaw and Choctaw Nation of Oklahoma. The study comprises three phases: 1) formative research assessing tribal community food environments and associated health outcomes; 2) intervention development to assess convenience stores and tailor healthy retail product, pricing, promotion, and placement strategies; and 3) intervention implementation and evaluation. In this paper we share the participatory research process employed by our tribal-university partnership to develop this healthy retail intervention within the unique contexts of tribal convenience stores. We summarize our methods to engage tribal leaders across diverse health, government, and commerce sectors and adapt and localize intervention strategies that test the ability of tribal nations to increase fruit and vegetable purchasing and consumption among tribal members. Study processes will assist in developing a literature base for policy and environmental strategies that intervene broadly to improve Native community food environments and eliminate diet-related disparities among Native Americans., Highlights • The process of designing and implementing the first healthy retail study in tribal convenience stores is described. • Community-based participatory research engaged diverse tribal leaders across health, government, and commerce sectors. • Findings will elucidate relationships between Native community food environments and disease.

New Child and Adult Care Food Program (CACFP) meal patterns and best practices were implemented nationally in 2017 to address the shift in dietary need from ensuring essential nutrient consumption to chronic disease prevention. Young American Indian (AI) children have disproportionately higher risk of chronic disease. Some AI tribes operate early care and education (ECE) programs and have the opportunity to participate in the CACFP. The purpose of this paper is to describe a CACFP best-practice menu and training developed and implemented as part of the Food Resource Equity and Sustainability for Health (FRESH) study, a community-based participatory research (CBPR) intervention implemented within ECE programs in the Osage Nation of Oklahoma. Site managers and cooks from each of the nine ECE programs attended meetings and provided investigators with feedback that shaped the best-practice menu and training. Each site participated in a three-hour training in January 2018 to discuss the best-practice menu and ways to overcome implementation barriers. Goals of the menu aimed to increase intake of fruit and vegetables and whole grains and reduce pre-fried and processed foods without increasing cook burden. Training included application activities individually and in small and large groups. Though the project is still underway, lessons learned, including the need for technical assistance, improved communication between ECE program staff and food supply vendors, and infrastructure barriers (e.g., limited space, lack of supplies) that challenge workflow, have emerged. Efforts to improve menus in rural and low-income ECE programs must consider these issues in developing feasible intervention strategies. Keywords: Native American, Early childhood, Community-based participatory research, Nutrition, Preschool