Yaksun, a medicinal diet, has been traditionally prepared and applied (based on theories in oriental medicine) for themodulation of disease symptoms and signs. However, restaurants that serve and claim Yaksun mainly focus on staminafoods. A consistent definition of Yaksun has not been provided, which can confuse the public interpretation of Yaksun. Thepurpose of this study was to investigate the perception of Yaksun in Korean adults living in Seoul, Gyeonggi, and Chungbukregions. Among the participants (M=55, F=168, 25y), only 10.4% understood the definition of Yaksun (mainly through thebroadcast media). The frequency of Yaksun consumed when eating out was 2~3 times per month in 50.2% of participants.The main reason for choosing a Yaksun menu (46.3% of participants) when eating out was for health. The mean satisfactionscore of Yaksun was 3.5±0.8 on the five point Likert scale. Participants highly agreed (3.8±0.8) that Yaksun is composedof nutritious foods combined with oriental medicinal herbs for the treatment of disease, which was significantly higher ingroups with learning experience on Yaksun (p<0.05). Interestingly, participants showed neutral to the description, that a dietwithout oriental medicinal herbs is not Yaksun (3.1±1.0), which was significantly different between genders (p<0.05). Menrecognized more than women that Yaksun should be based on oriental medical theory (p<0.05) and should be preparedfor the prevention or treatment of diseases (p<0.05). In conclusion, the concept and terminology of Yaksun need to bedefined and publicized in modern diet.