The present study investigated whether and how themed food series of picture books integrated into preschool daily life activities and curriculum can elevate young children's healthy dietary habits. In order to realize whether young children can recognize the healthy dietary habits, understand the eating attitudes between themselves and the roles in the picture book, and identify with the healthy eating attitudes. 30 children (aged 4-6 years) and 10 of their parents participated in co-reading sessions using 10 selected themed picture books on three morning days in preschool every week for 18 weeks. These children were randomly selected from the researchers' three classes in one preschool. Within the child-centered integrated curriculum design, the reading style was either passive or interactive or combined with classroom group discussion model. From 18 weeks' observation, recording, semi-structured interview with children and parents, and children's work and file analysis, the results suggest that 1. Picture books are effective when children are actively involved; 2. Children recognized with characters' positive dietary attitudes in picture books. 3. Children could clearly point out the similarities and differences between the roles' attitudes in the picture books and their own real life dietary attitudes. 4. Children had ability in identifying with characters' positive dietary attitudes in picture books. 5. Facing peers in classroom showing negative response in verbal expressions, actions and emotions to healthy food, children could offer practical solutions for verbal communicating or body language to guide others to conduct appropriate and healthy dietary behaviors.