en other Orginal research <div style="text-align: justify;"><span style="line-height:2;"><span style="font-family:Times New Roman;"><span style="font-size:14px;"><span style="unicode-bidi:embed"><span sans-serif=""><span style="color:#2980b9;"><b><i><span new="" roman="" times="">Background:</span></i></b></span> <span new="" roman="" times="">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</span><span new="" roman="" times="">.</span></span></span><br> <span style="unicode-bidi:embed"><span sans-serif=""><b><i><span new="" roman="" times="">Objectives: </span></i></b><span new="" roman="" times="">The purpose of this study was to determine the effectiveness of cognitive-behavioral therapy on eating behavior and weight loss in adolescents.</span></span></span><br> <span new="" roman="" times=""><span style="color:#2980b9;"><b><i>Methods:</i></b></span><span style="color:black"> 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.</span></span><br> <span style="unicode-bidi:embed"><span sans-serif=""><span style="color:#2980b9;"><b><i><span new="" roman="" times="">Results</span></i></b><b><span new="" roman="" times="">:</span></b></span><span new="" roman="" times=""> 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.</span></span></span><br> <span style="unicode-bidi:embed"><span sans-serif=""><span style="color:#2980b9;"><b><i><span new="" roman="" times="">Conclusion:</span></i></b></span><span new="" roman="" times=""><span style="color:#2980b9;"> </span>It is concluded that cognitive-behavioral therapy can be used as an effective treatment of weight loss and eating behavior in adolescents.</span></span></span></span></span></span></div> Adolescent, Weight loss, Feeding Behavior, Cognitive Behavioral Therapy 8 13 http://nmcjournal.zums.ac.ir/browse.php?a_code=A-10-870-1&slc_lang=en&sid=1 Mina Farrokhi farrokhi.mina@yahoo.com 100319475328460014273 100319475328460014273 No PhD Student, Department of Psychology, United Arab Emirates Branch, Islamic Azad University, Dubai, UAE Mohammadreza Seirafi msf_3@yahoo.com 100319475328460014274 100319475328460014274 Yes Assistant Professor, Department of Psychology, Karaj Branch, Islamic Azad University, Karaj, Iran Amin Rafieipour Rafiepoor2000@yahoo.com 100319475328460014275 100319475328460014275 No Assistant Professor, Department of Psychology, Payame Noor University, Tehran, Iran Hasan Ahadi DRhahadi5@gmail.com 100319475328460014276 100319475328460014276 No Professor, Department of Psychology, Karaj Branch, Islamic Azad University, Karaj, Iran Adis Kraskian Mujembari adis.kraskian@yahoo.com 100319475328460014277 100319475328460014277 No Assistant Professor, Department of Psychology, Karaj Branch, Islamic Azad University, Karaj, Iran