Abnormal body weight poses a risk of the development of various health disorders, having a negative impact on the quality and length of life. The prevalence of overweight and obesity among European children is estimated to be 10–20%. In Poland this figure reaches 18%. A war on the epidemic obesity waged from the youngest age of the child is a strategy that brings long-term health benefits for the entire population. Apart from the family, the school is the second important educational environment responsible for conducting health education activities among children and teenagers. School health educationprograms should be implementing by teachers in collaboration with other school staff, parents and the broadly understood local community. Comprehensive health education aiming at combating obesity should cover the entire population of school children and teenagers, with special attention given to high risk groups. The school, undertaking health education activities aimed at preventing abnormal body weight, should implement nationwide programs for the prevention of obesity, and should also pursue its own health education program based on its curriculum. In most cases, development of obesity at children results from improper eating habits and insufficient physical activity, and therefore school health education programs aimed at the prevention of overweight and obesity should focus on these two most important modifiable risk factors of abnormal body weight