This research was a one-group quasi-experimental research before and after joining a health education program about the knowledge and attitudes for breakfast consumption. The objectives were compared to the average knowledge scores and the average attitude scores before and after joining the program. Knowledge and attitudes of breakfast consumption were affected by participation in a health education program about the knowledge and attitudes for breakfast consumption. The samples were high school students who were amount of 40 people by random sampling at a school in Phra Nakhon Si Ayutthaya Province. Those data were collected before and after joining the program. The statistics which used for data analysis were frequency, means, percentage, standard deviation and paired sample t-test. It was different that knowledge levels and attitude levels of breakfast consumption before and after joining the program. Statistical significance showed that at p-value < 0.05.

The results showed that the most of knowledge levels before joining the program were moderate levels at 75% and after joining the program the knowledge levels were increased to high levels at 90%. For the attitude levels before joining the program were good levels at 70% and after joining the program the attitude levels were increased to 100%. When comparing the average of knowledge and attitude levels as before and after joining the program their results were significantly different that at p-value < 0.05.

            It can be concluded that the organization of the health education program about the knowledge and attitudes for breakfast consumption has an effect on the levels of knowledge and attitude of the samples. Also, this study showed the health education program about the knowledge and attitudes for breakfast consumption can improve high school students’ breakfast behavior.