Obesity has become a global problem. Its prevalence has been increasing not only in the world but also in the Czech Republic. There exist two main causes of its development - imbalance between energy reception and energy expenditure. This imbalance can be explained as an excessive food supply containing improper constitution and lack of movement. However, there can also occur genetic predispositions. Moreover, obesity is connected with various kinds of health complications. It cannot cause only physical problems but also psychological, social and economic ones. Reducing of weight is based on way of living including diet and movement. Long-term preservation of this regime is difficult. Is is much better to prevent occurrence of this negative phenomenon. Prevention activities should be done even at very early age. The aim of the thesis is to map out prevalence of obesity among pupils attending second stage of basic schools in Prachatice. The graduation thesis presents a quantitative research in which a questionnaire is used as the main research method. The targeted group comprises pupils attending second stage of basic schools in Prachatice. Prevalence of obesity is found out by using Body Mass Index and all obtained data are compared with percentile graphs. The research has shown that 4,8 % of them are obese and 11 % overweighted. Higher prevalence of obesity and overweight was detected with boys. The other aims of the graduation thesis are to find out other factors which can influence obesity. The influences contributing to the development of obesity can be eating in fast foods or being influenced by advertisements presenting food products. Monitored children admitted drinking of different sweet lemonades. The thesis introduces three hypothesis. First, chidren are unaware of health risks connected with obesity. The hypothesis is confirmed. Second, obese children prefer high-energy foods. This hypothesis is not confirmed. Third, obese children lack movement. The final hypothesis is confirmed. The thesis will be provided as an information source for public, mostly for parents and teachers. All obtained information is hoped to be used for increasing interest in prevention of childhood obesity.

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