The effects of a nutritional education program featuring cooking activities on 20 preschool children 6 years of age at a kindergarten in the Daegu suburb area. After applying the nutritional education program for 6 weeks, scores of dietary habits, dietary attitude and problematic dietary behaviors increased significantly from 3.68 to 3.83, 3.52 to 3.9 and 3.59 to 3.89, respectively (p<0.001). Problematic dietary habits, such as not eating a variety of foods, overeating, and having an unbalanced diet, were positively affected while problematic dietary behaviors, such as eating too much sweet food and liking instant foods, also underwent favorable changes. Among dietary attitudes, washing bands and brushing teeth before and after meals were the least changed items (0.15 out of 1). To improve dietary habits and behavior of preschool children, nutrition education programs cooking activities must be applied systematically.