Problem: The purpose of this study was to assess the level of nutrition knowledge, to determine how nutrition knowledge is related to food-related behavior among secondary students at a parochial day school, and to determine the effect on both of a nutrition-education program presented as bulletin-board displays.

Method: The population of this study consisted of all junior and senior students in the school. The students in two religion classes were selected for a total sample of 113 secondary students. Data were collected by means of an experimental pretest-posttest design to assess the relationship between nutrition knowledge and food-related behavior and to determine the effect on both of a nutrition-education program in the form of bulletin-board displays. For pretest and posttest the same questionnaires were structured; these included an information sheet, a nutrition knowledge test, and a food-related behavior test. Then the group was exposed to the treatment consisting of six educational objectives carried out in weekly bulletin boards. T-test and Spearman’s Zr1-Zr2 were used in the statistical analysis.

Results: The results of this study showed that while this form of nutrition education increased nutrition knowledge, no significant dietary changes occurred due to increased knowledge. In addition, knowledge of nutrition facts and application of that knowledge to dietary practices were not related.

Conclusion: Based on the findings of the present study, it was concluded that knowledge of nutrition facts and application of that knowledge to dietary practices were not related among this group for the period of time measured.