Introduction: Individuals should consume at least five portions of vegetables and fruit per day to maintain a healthy diet. Therefore, the factors that affect vegetable and fruit consumption among young people and adolescents should be identified, and the causes of inadequate consumption of vegetables and fruit should be examined. The aim of this study was to determine the daily amount of vegetable and fruit consumption of adolescents studying at secondary and high schools, their distribution according to the vegetable and fruit consumption change stages in the transtheoretical model, and the factors related to the change processes. Method: This study used a descriptive research design. It was conducted in 2016 at four secondary schools and three high schools affiliated with the Fethiye District Directorate of National Education. The data were collected from 1,870 students through stratification conducted at each school. An introductory information form, the transtheoretical model vegetable and fruit consumption change stages and change process scales were used to collect the data. Number, percentiles, independent samples t-test and Oneway Analysis of Variance (ANOVA) were used for analysis of the data. Findings: This study found that the participants were aged from 11 to 17. Of the participants, 59.4% were male, and approximately two thirds of them were secondary school students. According to the change stages of the transtheoretical model, 32.1% of the students were regularly consuming five portions of vegetables and fruit for more than one month. This study also found that there was a statistically significant difference between the sex, age, grade, number of siblings of the students, the economic status of their families, having the support of their families and friends, their access to vegetables and fruit at home and school, and their daily consumption of vegetables and fruit, as well as their fruit and vegetable consumption behaviors (p<.01). The change stages of the transtheoretical model and the vegetable-fruit consumption behaviors of the students were found to be related (p<.05). Conclusion: This study found that the vegetable and fruit consumption of males and adolescents older than 15 years of age was inadequate; factors such as economic status, the influence of family and friends, and access to vegetables and fruit had effects on consumption. The number of portions consumed per day was related to the vegetable and fruit consumption behavior. Considering these results, it is recommended that health improvement practices should be developed, and the support of individuals and institutions should be increased, including the support of family, school, friends, teachers, and health institutions in particular. These health improvement practices should be developed for students who are older, who are in the upper grades, who are male, who suffer from economic insufficiency, and who lack access to vegetables and fruit. Access to vegetables and fruit should be made easier in the areas where these st...