Aim: to assess the effectiveness of planned teaching program on knowledge and attitude among adolescence students regarding health hazard of junk food in selected senior secondary schools, district Hisar (Haryana) India.

Research design: Pre-experimental research design (one group pre- test post-test) was used in the study.

Results: The present study reveals that in the pre test the mean knowledge score obtained by the adolescent students was 10.28 and standard deviation 2.585. In the post test the mean knowledge score obtained by the adolescent students was 16.35 and standard deviation 1.849. It is evident that the obtained "t" value 30.107 is greater than the table value at 0.05 level of significance. The study also reveals that in the pre test the mean attitude score obtained by the adolescent students was 63.72 and standard deviation 2.805. In the post test the mean attitude score obtained by the adolescent students was 85.40 and standard deviation 2.853. It is evident that the obtained "t" value 39.312 is greater than the table value at 0.05 level of significance. Hence, H1 and H2 hypothesis was accepted. The Chi-square value shows that there is no significance association between the pre test knowledge and attitude score with demographic variables (Age, religion, class of studying, education of father, education of mother, residence, type of family, family income and previous source of information). The calculated chi-square values were less than the table value at the 0.05 level of significance.

Conclusion: After the detailed analysis, this study leads to following conclusions. The overall mean of the post test knowledge and attitude score is higher than the mean pre test knowledge and attitude score regarding health hazard of junk food. So planned teaching program was effective. Hence, H1 and H2 hypothesis was accepted. Study also reveals that there is no association between pre test knowledge and attitude score with their demographic variables. Hence, H3 and H4 hypothesis was rejected.