Introduction
obesity, TLL
OBESITY
The increasing prevalence of obesity has been, and remains, a major global challenge, where rapid changes in dietary and food behaviors –and as a consequence, excess energy intake- are the main causes of this rising trend (Energy imbalances and physical inactivity in children and adolescents are of particular concern (Nutrition labels, taxes, and subsidies on healthy foods are examples of policy interventions that can target public behavior and the environment. Food labeling, in particular, has attracted the interest of researchers and policymakers, since it is considered as a nudging strategy that can encourage healthier eating (Traffic light labels (TLL) were first invented by non-governmental organizations in the United Kingdom in the early 1990s (Recently, a new type of label that takes physical activity into consideration has been examined in different studies in high-income countries (Although food labels have been used in Iran for many years, studies show that consumers’ usage rates are low (