The aim of this study was to draw attention to the issue of obesity, which has been growing for over a dozen years, in particular its epidemiology and pathogenesis. Obesity is a consequence of weight gain due to a positive energy balance, i.e.: the consumption of more calories than the body demands. Excessive fat gain, exceeding human body’s physiological needs and adaptation possibilities leads to structural and functional defects of many organs and systems, biochemical and physiological disorders, and as a consequence to shortening the life expectancy. Among the many methods assessing the severity of obesity, the most common and most frequently used is the determination of the body mass index (BMI), which is the quotient of body weight (kg) and height (m) squared. Using this method, we recognize overweight in patients with a BMI between 25 and 29.9 kg/m2, and obesity with BMI above 30 kg/m2. Morbid obesity is diagnosed when the patient’s BMI is above 40 kg/m2.
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