The problem of obesity among children and young people is growing, and Polish schools are not always prepared to respond appropriately. Data from studies conducted in Warsaw and Katowice show that a significant percentage of students struggle with excess weight, the main causes of which are poor diet and lack of physical activity. The text addresses the lack of systemic support in schools and the inadequate implementation of preventive programmes. It also points to the need for more educational activities. The importance of counteracting discrimination, supporting overweight students during classes, and the proper approach on the part of teachers and parents cannot be overstated.