<![CDATA[Introduction & Aim: Previous research at Jemursari Islamic Hospital, Surabaya, demonstrated a strong positive relationship between self-efficacy and dietary adherence among people with diabetes mellitus. The finding was translated into the YAKIN 3J Program (confidence in managing food according to Amount, Type, and Schedule), which aimed to strengthen self-efficacy and dietary adherence among people with diabetes mellitus in Tembok Dukuh Village, Bubutan District, Surabaya. Method of Activity: Community service was conducted from June to August 2026 with 35 participants. Activities included baseline assessment, simple and repeated 3J dietary education, behavioral goal setting, menu and portion practice, peer sharing, family involvement, food-monitoring records, and weekly mentoring. Evaluation used the Diabetes Management Self-Efficacy Scale (DMSES) and Dietary Behavior Questionnaire (DBQ) before and after the program, with changes analyzed using the Wilcoxon test. Results: Participants were predominantly women (63%); the largest age group was 40–60 years (40%), and 34% had senior high school education. Sixty percent were recorded as not taking medication, 51% had lived with diabetes for less than five years, and 40% were recorded in the >200 mg/dL blood-glucose category. In the illustrative pre-post analysis currently used in the manuscript, median self-efficacy increased from 53.0 to 66.0 and median dietary adherence from 43.0 to 54.0 (both p<0.001; large effect sizes). Discussion: Participant characteristics support the need for practical, repeated, and individualized education. Strengthening mastery experiences, peer support, verbal encouragement, family support, and self-monitoring may increase confidence and consistency in applying the 3J diet.]]>
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