Description: Undernutrition and overnutrition are relevant Public Health problems in Colombia. We conducted a nutritional survey in Tunja to assess the magnitude of the problem in order to guide government interventions and serve as a baseline for future evaluations. schoolchildren were randomly selected among all private and public schools. Information on health status, socioeconomic and demographic characteristics of their families was collected using a questionnaire, which also included the Colombian Household Food Security Scale. Anthropometric measurements of 1168 schoolchildren (5 to 19 years old) were obtained, analyzed with WHO AnthroPlus, and associated with the mentioned variables by further statistic analysis.