Background: Obesity is a public health issue with an increasing prevalence across all age groups globally. Furthermore, obesity can be treated and prevented using several methods, including education intervention. Objective: This study aims to determine the impact of education intervention
using an e-booklet on knowledge enhancement and food intake improvements. Method: This study used a single-group pre-posttest intervention approach on senior high school adolescents in Kulon Progo Regency, Yogyakarta, Indonesia. The sample was selected based on inclusion criteria, including
students from State Senior High School 1 Sentolo, grades X and XI, willing to participate as respondents, available during data collection, and with BMIZ > 1 SD, totaling 46 individuals. In addition, education intervention was provided through an e-booklet through a WhatsApp group, while knowledge and food intake data were observed during the pretest, posttests 1 and 2. Knowledge data were collected through a questionnaire, while food intake data were collected using 2 x 24-hour food recall and analyzed with t-test and Wilcoxon test. Results: The knowledge scores of the students during the pretest, posttest 1, and posttest 2 were 56.3, 94.5, and 98.5, respectively. The results showed that there was a significant increase in knowledge in both posttests 1 and 2. Furthermore, energy, protein, carbohydrate, and fat intake levels decreased during the pretest, posttests 1 and 2 measurements. Energy intake decreased by 126%, 110%, and 91%, while protein intake reduced by 163%, 156%, and 106%. The fat intake also decreased by 153%, 137%, and 106%, while carbohydrate intake reduced by 100%, 91%, and 76%. The analysis showed a significant improvement in food intake in both posttests 1 and 2 except for carbohydrate intake in posttest-1. Conclusion: Based on these findings, nutrition education using an e-booklet had a positive impact on increasing knowledge about obesity and improving food intake among overweight and obese adolescents.