The aim of this study was to acquire information related to recognition of atopic dermatitis, asthma, and snack intake status among middle school students in the Seoul area. The survey was carried out by self-questionnaires on 535 students in the 2nd and 3rd grade (88 Patients: atopic dermatitis and asthma group and 428 Control: healthy group). All data were analyzed using SPSS (version 13.0) software. The results were as follows: Among patients, females (61.4%) had a significantly higher prevalence of symptoms than males (38.6%) (p<0.001). Body mass index was not significantly different between the patients and Control group. The most common source for obtaining information about atopic dermatitis and asthma was ‘TV or radio’ (38.4%), followed by ‘family members or relatives’ (27.3%) in patients, but ‘Internet’ (22.2%) was most common in the control group (p<0.05). Although awareness of atopic dermatitis and asthma was similarly low between the two groups, patients had a higher percentage of correct answers on atopic knowledge (p<0.05). However, there was no significant difference in knowledge of asthma between the two groups. Frequency of snack intake was significantly lower in patients (p<0.05), and consumption of sundae, fried food, liquefied fermented milk, hamburger, pizza, and french fries was also significantly lower (p<0.05). The reason of selecting snacks was mainly ‘taste’ in both groups. In conclusion, education regarding atopic knowledge and appropriate snack selection is necessary for students with atopic dermatitis or asthma.