Background: This study aimed to investigate the dietary habit problems related to lifestyle by analyzing health behaviors and dietary habits in Korean young adults.Methods: Adults aged 20≥ and ≥39 years single-person households who participated in the survey were included in the study. Subjects were classified into food related lifestyle. Subsequently, characteristics, health behaviors, dietary habits were analyzed.Results: The participants of the study were classified into five types: a ‘taste-type’, an ‘economy-type’, a ‘convenience-type’, a ‘health-type’, and a ‘safety-type’. As a result of comparing eating habits by food-related lifestyles, the ‘economy-type’ showed the highest dietary assessment with a score of 3.18, while the ‘safety-type’ ranked the lowest, a score of 2.54. The ‘economy-type’ scored highest they ate out less, cooked more, suggesting a need for nutritious cooking classes. The ‘health-type’, with more men and price-conscious individuals, sought healthier convenience options. The ‘taste-type’ preferred food delivery and dining out, needing balanced menus. In contrast, the ‘convenience-type’ overate, scoring low in habits, emphasizing the need for healthier menus and support. The ‘safety-type’ which has a high percentage of jobs in the service industry and high school graduates, showed the need for policy support for better diet.Conclusions: Young single-person households have different dietary problems depending on their food-related lifestyle. Therefore, we recommended for the customized dietary education considering the characteristics of each type.