The subject of this final work is the importance and role of physical activity and healthy nutrition in preschool children. This topic stands out as an important factor in the upbringing and education of children due to its exceptional influence on the future psychophysical development of children. The aim of the work was to analyze the role of nutrition and regular physical activity in preschool children. Highlighted is the role of educators, parents and other experts. On the basis of relevant research and scientific papers, it is concluded that proper nutrition and engaging in appropriate physical activity in preschool age can have a preventive effect on the occurrence of chronic diseases and problems in the growth and development of children, and at the same time are necessary for proper psychophysical growth and development. The author of the paper analyzed and summarized previous research and conclusions that put obesity and other diseases in the foreground as a real and ubiquitous danger that threatens children at this age, which is in many ways crucial for their development. The paper presents basic information on the necessary intake and type of nutrients and energy for children up to the age of six, and presents the issue of unhealthy food and inactivity. The last part of the paper analyzes the role of physical activity as another important factor in children's development. The author described the role of exercise and playing sports in preschool children and how motor exercises contribute to the psychophysical and social development of children. The problem of unequal opportunities that children have in terms of access to sports and physical activity was highlighted, and examples of good practice at the national level were highlighted.