en public specific orginal article <div style="text-align: justify;"><span style="font-size:10.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times="">Nutrition literacy is the individuals&#39; motivation and ability to obtain, process, and understand nutrition information and the skills needed in order to make appropriate nutrition decisions. The present study was conducted to determine the validity and reliability of the Chongqing Middle School Nutrition Literacy Scale (CM-NLS). <b>Methods:</b> The CM-NLS questionnaire was translated into Farsi and then back-translated, and its face validity and quantitative and qualitative content validity were investigated in a descriptive-cross-sectional study. This review was conducted using the opinions of expert faculty members. Besides, the Persian version was tested in a sample of 400 students of the first grade of high school in Bandar Anzali city. For this purpose, two schools were randomly selected and sampled using census method. Cronbach&#39;s alpha test method was used to examine reliability, and confirmatory factor analysis was used to evaluate construct validity (RMSEA=0.062). <b>Results:</b> In checking face validity, changes were made in the questionnaire, and some items were removed in content validity evaluation by calculating </span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times=""><span style="letter-spacing:.1pt">content validity ratio (CVR) and content validity index (CVI)</span></span></span></span><span style="font-size:10.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times="">. In reliability analysis, Cronbach&#39;s alpha coefficient was calculated as 0.74 for functional literacy, 0.82 for interactive literacy, and 0.84 for critical literacy. The results of confirmatory factor analysis showed a good fit to measure the construct validity. <b>Conclusions:</b> Based on the results obtained, the CM-NLS questionnaire with 33 items, is a valid and reliable tool and can be used to measure the nutrition literacy of high school students</span></span></span></div> <div style="text-align: justify;"></div> Nutrition science, Child nutrition, Face validity, Validity and reliability 631 642 http://jnfs.ssu.ac.ir/browse.php?a_code=A-10-216-4&slc_lang=en&sid=1 Elnaz Ashrafi 0000-0003-4337-6457 No Department of Health Education and Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Morteza Mansourian mansourian55@ gmail.com 0000-0002-2482-5424 Yes Health Promotion Research Center, Iran University of Medical Sciences, Tehran, Iran Farbod Ebadi Fard Azar - 0000-0002-8242-3116 No Department of Health Education and Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Fereshteh Osmani - 0000-0002-6112-7131 No Dental Clinical Research Development Unit, Birjand University of Medical Sciences, Birjand, Iran Mehran Nouri No Students Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran.