Studies have shown that training is effective in the prevention of obesity and overweight. The purpose of this study was to investigate the effect of nutrition training on improving the nutritional knowledge of students. This study was conducted with a before-after study design on 35 students in 2019. A questionnaire was used to collect the required data and participants utilized a mobile application (app) to increase their nutrition knowledge. Implementation of this app had a positive effect on increasing all 3 types of nutritional knowledge. The results showed that the use of the app improved nutritional knowledge of the study population.