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SELECTED NUTRIENTS IN ETIOLOGY, PREVENTION AND TREATMENT OF OBESITY The 21st century pandemic of obesity is given by to the obesitogenic environment that helps to develop a positive energy balance, where the energy intake of an individual chronically exceeds his energy need, ie energy expenditure. There is an increase in body weight by increased or abnormal body fat accumulation in the body. Preventing the development of obesity is aimed at achieving energy balance, in the case of existing overweight or obesity, the treatment lies in inducing and maintaining a negative energy balance for some time, ie stimulating energy expenditure and reducing energy intake. Selected diet determines not only energy intake, but its individual nutrients can also partially affect energy expenditure and fat tissue physiology. The aim of this work is to describe and experimentally verify some nutrients that could help in weight reduction and physiological function of adipose tissue. Based on the literature data, 19 active substances or mixtures were considered. A mixture of ω-3 polyunsaturated fatty acids (ω-3 PUFA), eicosapentaenoic acid and docosahexaenoic acid, in a daily dose of 0.6 g, in the form of fish oil in a certified food supplement was chosen as the most suitable for the experiment. In a 12-week, three-arm, parallel...