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Objectives: The purpose of this study was to analyze the effects of diabetes duration on healthy eating behavior among Korean adults, propose an effective intervention strategy to facilitate health behaviors, and provide scientific evidence for diabetes management policy development. Method: This study used data from the 7th wave of Korea National Health and Nutrition Examination Survey(KNHANES) 2016-2018 utilized. The final analysis included 855 individuals aged 20 to 64 years who had been diagnosed with diabetes. To examine the relationship between diabetes duration and healthy eating behaviour, logistic regression analyses, including gender-stratified models, were conducted. Result: Our results showed that individuals with a diabetes duration of 15 years or more had a 35% lower likelihood of practicing healthy eating behavior compared to those with a duration of less than 5 years. Individuals with the lowest educational attainment were also less likely to practice healthy eating behavior, while those engaging in aerobic physical activity had significantly higher odds. The results from gender-stratified model indicated that the lowest income and lowest education levels were associated with lower likelihood of healthy eating behavior, whereas smokers showed higher odds of healthy eating among women. In men, those with a high school education and a disease duration of 15 years or more had lower odds of healthy eating, whereas engagement in aerobic physical activity were linked to better dietary practices. Conclusions: Our findings highlight that the duration of diabetes influence healthy eating behavior, emphasizing the importance of educational and counseling programs to promote healthy eating practices as well as the development of support programs for patients and their families.