Metabolic syndrome is a group of risk factors, including abdominal obesity, arterial hypertension, dyslipidemia and glucose metabolism disorders (prediabetes and type 2 diabetes mellitus). This syndrome affects about a quarter of the total population and raises the risk for developing especially cardiovascular diseases. In addition, it also affects other health areas, so this problem is very serious. This work consists of two parts. Part one, theoretical, describes metabolic syndrome, i.e. its precise diagnostic criteria, causes, main risks, prevention and pharmacological and non-pharmacological treatment, which may be invasive (bariatric surgery), but mainly consists in lifestyle changes. Part two of the thesis, practical, presents a resea...