Background: Considering the high prevalence of obesity among children attending elementary schools, it is important to know the evolution of body weight when these children reach adolescent.
Aim: To analyze the changes in nutritional status of children between the first year of elementary school and the first year of high school.
Material And Methods: A historical cohort of children that were assessed when they started elementary school in 1997 was evaluated again eight years later Weight and height were measured and body mass index (BMI) was calculated.