In the introductory part of the literary research my diploma thesis explains the me-tabolism of nutrients in the body of the chow and the function of energetic metabolism. The next part is devoted to assessment of human nutritional status, where methods of body composition and nutritional indicators are described, including appropriate nutritional recommendations. The conclusion of the research deals with the problems of obesity, its causes and the way of therapy. In connection with obesity, reduction courses focusing on the STOB organization are described. The practical part is focused on the assessment of changes in the eating habits of participants of the STOB Reduction Course on the basis of the questionnaire submitted by me. Furthermore, the development of the composition of individual parts of the body and the assessment of anthropometric data are monitored. Values are monitored before and after the course for 12 weeks. The obtained data are statistically evaluated in STATISTICA 12 programme and the resulting values are then compared with the recommended values.