This final paper deals with the differences between the functional capacity of children and their degree of nutrition. Research on the same should be carried out more frequently to raise awareness of the issue of poorly developed functional abilities of children and the worrying results of the degree of nutrition obtained by measuring body mass index. Nowadays, children usually do not spend their free time on physical activities, among which the most important one is the game. The consequence of a sedentary, stressful, and hectic lifestyle results in negative consequences for everyone. Among these consequences we can also highlight those that stand out the most in this paper – obesity and underdevelopment of functional abilities. Being overweight is a limiting factor in development, and World's health (WHO) organization statistics don't sound promising either. For this reason, in preschool institutions, through physical and health culture classes and other extracurricular forms, children should be created the opportunity to satisfy the need for movement. The primary goal of upbringing is to act on functional abilities, but it is very important that they develop anyway because they carry numerous benefits such as affecting the child's respiratory system and fitness, improving vital capacity, and therefore transporting oxygen in the body. As already mentioned, children need to be given opportunities to move to prevent these limiting development factors in time. All the hypotheses are evidenced by the research that was carried out for the purpose of writing this final paper. More specifically, the aim was to prove whether the degree of nutrition has a significant impact on functional abilities. Participants in the study were five- and six-year-olds attending Gvozd Kindergarten. The results confirmed all the hypotheses that were listed before the study.