en public specific orginal article <div style="text-align: justify;"><strong>Background: </strong>Anthropometric studies in children and adolescents are important to screen changes in growth and puberty. Hence, standard percentiles and cutoffs are set by the World Health Organization (WHO), Centers for Disease Control and Prevention (CDC), and Iranian national criteria. This study aimed to examine and compare the prevalence of weight disorders in children and adolescents in <a name="_Hlk59641185">Lorestan</a> province according to different criteria.<strong> Methods: C</strong>hildren and adolescents (6&ndash;18 years) were randomly selected from the urban and rural areas by the multistage stratified cluster sampling method. All Iranian citizens aged who resided in Lorestan province for at least one year were eligible to participate in this study. After obtaining consent forms, researchers gathered the accurate anthropometrics and body mass index (BMI) measurements. <strong>Results: </strong><a name="_Hlk69855967">A total of 866 children and adolescents took part in the study, 447(51.6%) of whom were girls and 419 (48.4%) were boys.</a> The overall prevalence of overweight and obesity was 17% in boys and 12.5% in girls. The prevalence of underweight in girls was 5.8%; while in boys it was 4.5%. The total prevalence rate of underweight according to the national criteria was 5.2%. However, this rate increased to 12% and 12.6% by using WHO and CDC cut-off points, respectively. The highest prevalence of overweight was obtained by CDC (15.8%), followed by WHO (13%); while national cut-off points resulted in 9.7%. Furthermore, 9.2% of the studied population was found to be obese by WHO; while this rate was 4.2%, and 5% by CDC and national cut-off points. <strong>Conclusion: </strong>This study indicated the coexisting prevalence of underweight and obesity and high prevalence of overweight among children and <a name="_Hlk59657891">adolescents</a> in Lorestan province. Furthermore, using the WHO and CDC criteria leads to overestimating the prevalence of weight disorder compared to the national cut-off points in Iran.<br> &nbsp;</div> Weight disorders, Children and adolescents, Body mass index. 352 359 http://jnfs.ssu.ac.ir/browse.php?a_code=A-10-321-1&slc_lang=en&sid=1 Motahare Hatami Marbini hatami.m@iums.ac.ir 0000- 0002- 0972- 7885 Yes Department of Nutrition, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Hedayat Nazari No Lorestan University of Medical Sciences, Khorramabad, Iran. Mohamad Reza Mohammadi 0000-0002-7061-5938 No Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran. Seyed-Ali Mostafavi 0000-0002-8008-3824 No Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran Ali Khaleghi 0000-0002-9035-7075 No Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran Nastaran Ahmadi 0000-0001-9885-0326 No Yazd Cardiovascular Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Hosein Parsamehr No Lorestan University of Medical Sciences, Khorramabad, Iran Farzaneh Abbasi Motlagh No Lorestan University of Medical Sciences, Khorramabad, Iran Ameneh Tajipoor No Lorestan University of Medical Sciences, Khorramabad, Iran. Zohreh Godarzi No Lorestan University of Medical Sciences, Khorramabad, Iran Saba shokri Moghadam No Lorestan University of Medical Sciences, Khorramabad, Iran. Shirin Kumasi Jodaki No Lorestan University of Medical Sciences, Khorramabad, Iran. Hamzeh Salehi Kia No Lorestan University of Medical Sciences, Khorramabad, Iran. Maryam Veyskarami No Lorestan University of Medical Sciences, Khorramabad, Iran Samira Beyranvand No Lorestan University of Medical Sciences, Khorramabad, Iran