Education intervention is a planned set of procedures which aims at teaching a specific set of academic or social skills to an individual or group. Providing such an intervention in school stage can help students to develop healthy habits of nutrition and health. Hence, an effort was made to assess the knowledge gain of students on selected topics through given intervention and to analyze retention of knowledge gain through “before and after” type of experiment. Total mean score of pre-test (72.67) and post-test (83.48) of nutrition was compared and highly significant difference was found. Similarly, total mean score of health was found to be 69.31 in pre-test and 84.89 in post-test. Further, analysis showed that the mean scores in post-test decreased after 15 days but the score increased after 30 days. The overall mean score of students with respect to knowledge about nutrition was 72.67 before intervention which increased to 82.44 after 30 days of intervention. With regard to health, highly significant change in mean scores of students was found from 69.31 (in tests before) to 84.47 (after 30 days of education intervention). Thus, it is clear that educational intervention had a significant impact on knowledge regarding both nutrition and health.