Introduction: Childhood overweight and obesity are public health problems in Mexico, so it is necessary to create environments that train and motivate positive behaviors in relation to a healthy lifestyle.

Objectives: To determinate the prevalence of overweight and obesity. Describe physical activity and sedentary behaviors with socioeconomic status.

Material and methods: A descriptive, observational, cross-sectional and prospective study was carried out in 278 students between six and 12 years old. The BMI was calculated, four questionnaires were applied: CVAFA, CCSNP, CNSE, AMAI 2018.

Results: the prevalence of overweight and obesity was 42.7%. Vigorous physical activity 49.6%. A 95% spend two hours a day in front of the television, 87% use the computer an hour a day for homework. 32% nap for 30 minutes. The economic level is correlated to the first three levels.

Conclusions: the prevalence of overweight and obesity represents almost half of the student population. The obesogenic type diet results in a high BMI, although the economic level allowed obtaining quality food. Significant physical activity was also performed by a low percentage of students. The hours of rest were found to be appropriate for their age.

Keywords: obesity, physical activity, socio-economic level.