Malnutrition and sedentary lifestyle represent growing problems in the Peruvian school population. This study aimed to determine the relationship between nutritional status and physical activity in primary students at I.E. República de Venezuela, Iquitos 2025. A quantitative, observational, cross-sectional, correlational study evaluated 176 students from fourth to sixth grade through standardized anthropometric measurements (weight, height, BMI) and the validated PAQ-C questionnaire. Results showed combined prevalence of overweight and obesity of 30.1% (13.6% and 16.5% respectively), with obesity predominant in males (17.3%) and overweight higher in females (15.3%). Linear growth was adequate (96.6% normal height-for-age). Regarding physical activity, 82.4% showed moderate levels, 12.5% low, and 5.1% high, with critical decrease in higher grades (31.8% low PA in 6th vs. 1.7% in 4th). Ge...