The increased prevalence of overweight and obesity observed in recent decades has been attributed mainly to behavioral changes, such as excessive food consumption and reduction in physical activity level over time, leading to a positive energy balance. Due to the technological advances in recent years, less physical effort is required to perform daily tasks. Moreover, the lifestyle has become more sedentary, with an increasing amount of time spent using digital gadgets, such as computers, televisions and mobile phones. However, Westerterp & Speakman did not find a decrease in physical activity energy expenditure during the last 30 years preceding their study, despite an increase in the prevalence of obesity. Other studies have also reported that the total energy expenditure of rural populations was similar to that of populations living in developed countries, despite the clear difference in behavioral patterns, particularly in relation to daily physical activities.– This study aimed at presenting the “compensatory effect” as a possible explanation for these findings. When there is an increase in physical activity at a given time, behavioral and metabolic changes take place to maintain an energy setpoint, as presented below.
Physical exercise has been recommended as an important component for the prevention and treatment of obesity. For substantial adults’ health benefits, at least 150 minutes of moderate-intensity aerobic exercise, or 75 minutes of vigorous-intensity aerobic exercise; in addition, 2-3 times per week of resistance training is recommended. However, for a clinically significant reduction in body weight, Donnelly et al., recommended that individuals should gradually increase the amount of physical activity and achieve a weekly volume of moderate physical exercise of over 250 minutes. The authors also reported a dose-response effect between physical activity and weight loss.
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