The intention of the 21 st century we entered a strong global growth in the multitude of comparatively few in number, large cities. Large, dense cities can be highly efficient. It is most desirable that side, by the heads of the green, and the future porticos. Bearing to the influx of the citizens of the new challenges of the rapid advance to command positions. To accumulate the benefits, with a positive, as well as a dense fog, in one state, to measure the informal are the negative aspects of the development of equal, traffic congestion, waste, wealth management approach is wrong. The demand for services is immediate, tribute, and custom, that you might found after them. At the same time in the company the first side of the planet will be in the forms of competition which known to you -a capital for the sake of wealth, and the creative class. These challenges to an approach to the design of new experiments, A finance committee, to the construction of the urban infrastructure and services, which is similar to the operation of the government and the smart cities. Fact this approach to the emerging of the knowledge of the time, technology. This paper is devoted to investigate concepts and principles of Smart City and sustainable urban development, components and urban planners' role.

Background: Nutrition education is a key component of health promotion programs and leads to the improvement of nutritional behaviors of adolescents. Understanding the stages of cognitive-behavioral therapy in eating behavior and weight loss in adolescents is important in terms of preventive care. Objectives: The purpose of this study was to determine the effectiveness of cognitive-behavioral therapy on eating behavior and weight loss in adolescents. Methods: The research method was semi-experimental with a pre-test and post-test design with a two-month follow-up with the control group. The statistical population consisted of all adolescents referred to counseling centers in Mashhad in autumn 2019; 30 of them were selected by convenience sampling method and were randomly divided into experimental, and control groups. The research questionnaires were demographic questionnaire, and eating behavior questionnaire. Data were analyzed using repeated variance analysis and SPSS.22 software. Results: The mean (SD) of age was 17.66 (4.49) years in the experimental group 59.7% and 17.01 (4.10) years in the control group. 65.9% in the experimental group and in the control group, 59.7% were girls and the mean (SD) of body mass index was 27.73 (1.34) in the experimental group and 27.32 (0.95) in the control group. The results showed that cognitive-behavioral therapy was effective in decreasing uncontrollable eating (P<0.01), emotional eating (P<0.01), weight loss (P<0.01), and increasing cognitive restraint (P<0.01) in adolescents. Conclusion:It is concluded that cognitive-behavioral therapy can be used as an effective treatment of weight loss and eating behavior in adolescents.