Objective: To calculate the prevalence of being overweight amongst children aged between 8 and 16 years old in the Bogotá school system, and to determine if there were any risk or protective factors that could be identified to develop this pathology. Materials and methods: Data was taken from the QAPACE study which studied children between 8 and 16 years old from 1840 schools in Bogotá. The children completed a questionnaire which was designed to gauge the energy used by each child; to identify any anthropometric conditions; and to evaluate the physical state of each child. Each case was classified according to IMC limits; CDC and International Indices; and percentage of body fat, using the Siri equation. The relation between the possible risk factors identified and the results of the tests was then evaluated. Results: According to the CDC the instance of being overweight is 7.5%, with obesity at 1.63%. According to International Indices the values observed for being overweight or obese are 7.61% and 0.6% respectively with the respective percentages of body fat being 3.86% and 1.79%. Significant differences between the genders were not encountered. The principal risk factors identified were; lack of exercise outside school; having a Legér test lower than recommended minimum levels for fitness gram; and sleeping less than 7 hours per night. The concordance between the different diagnostic methods used was in excess of 92%. Conclusions: The incidence of being overweight in Bogotá, according to the CDC is 9.1%; according to International Indices 8.2%; and according to the percentage of body fat 5.6%.