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Just as smart but not as successful: obese students obtain lower school grades but equivalent test scores to nonobese students

Abstract

Objective:

The obesity epidemic in industrialized nations has important implications for education, as research demonstrates lower academic achievement among obese students. The current paper compares the test scores and school grades of obese, overweight and normal-weight students in secondary and further education, controlling for demographic variables, personality, ability and well-being confounds.

Participants:

This study included 383 eighth-grade students (49% female; study 1) and 1036 students from 24 community colleges and universities (64% female, study 2), both drawn from five regions across the United States.

Measures:

In study 1, body mass index (BMI) was calculated using self-reports and parent reports of weight and height. In study 2, BMI was calculated from self-reported weight and height only. Both samples completed age-appropriate assessments of mathematics, vocabulary and the personality trait conscientiousness. Eighth-grade students additionally completed a measure of life satisfaction, with both self-reports and parent reports of their grades from the previous semester also obtained. Higher education students additionally completed measures of positive and negative affect, and self-reported their grades and college entrance scores.

Results:

Obese students receive significantly lower grades in middle school (d=0.83), community college (d=0.34) and university (d=0.36), but show no statistically significant differences in intelligence or achievement test scores. Even after controlling for demographic variables, intelligence, personality and well-being, obese students obtain significantly lower grades than normal-weight students in the eighth grade (d=0.39), community college (d=0.42) and university (d=0.31).

Conclusion:

Lower grades may reflect peer and teacher prejudice against overweight and obese students rather than lack of ability among these students.

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References

  1. Pyle S, Sharkey J, Yetter G, Felix E, Furlong M, Poston W . Fighting an epidemic: the role of schools in reducing childhood obesity. Psychol School 2006; 43: 361–376.

    Article  Google Scholar 

  2. Ogden C, Carroll M, Flegal K . High body mass index for age among US children and adolescents, 2003-2006. JAMA 2008; 299: 2401–2405.

    Article  CAS  Google Scholar 

  3. Sigfúsdúttir I, Kristjánsson A, Allegrante J . Health behaviour and academic achievement in Icelandic school children. Health Educ Res 2007; 22: 70–80.

    Article  Google Scholar 

  4. Datar A, Sturm R . Childhood overweight and elementary school outcomes. Int J Obes 2006; 30: 1449–1460.

    Article  CAS  Google Scholar 

  5. Datar A, Sturm R, Magnabosco J . Childhood overweight and academic performance: national study of kindergartners and first-graders. Obes Res 2004; 12: 58–68.

    Article  Google Scholar 

  6. Kaestner R, Grossman M . Effects of weight on children's educational achievement. NBER Work Pap Ser 2008; 13764: 1–35.

    Google Scholar 

  7. Sabia J . The effect of body weight on adolescent academic performance. Southern Econ J 2007; 73: 871–900.

    Google Scholar 

  8. Carter M, Dubois L, Ramsay T . Examining the relationship between obesity and math performance among Canadian school children: A prospective analysis. Int J Pediatr Obes 2010; 5: 412–419.

    Article  Google Scholar 

  9. Li Y, Dai Q, Jackson J, Zhang J . Overweight is associated with decreased cognitive functioning among school-age children and adolescents. Obesity 2008; 16: 1809–1815.

    Article  Google Scholar 

  10. Huang T, Goran M, Spruijt-Metz D . Associations of adiposity with measured and self-reported academic performance in early adolescence. Obesity 2006; 14: 1839–1845.

    Article  Google Scholar 

  11. Karnehed N, Rasmussen F, Hemmingsson T, Tynelius P . Obesity and attained education: cohort study of more than 700,000 Swedish men. Obesity 2006; 14: 1421–1428.

    Article  Google Scholar 

  12. Janssen I, Craig W, Boyce W, Pickett W . Associations between overweight and obesity with bullying behaviors in school age children. Pediatrics 2004; 113: 1187–1194.

    Article  Google Scholar 

  13. Neumark-Sztainer D, Story M, Harris T . Beliefs and attitudes about obesity among teachers and school health care providers working with adolescents. J Nutr Educ 1999; 31: 3–9.

    Article  Google Scholar 

  14. Greenleaf C, Weiller K . Perceptions of youth obesity among physical educators. Soc Psychol Ed 2005; 8: 407–423.

    Article  Google Scholar 

  15. Crandall C . Do parents discriminate against their heavyweight daughters? Pers Social Psych Bull 1995; 21: 724–735.

    Article  Google Scholar 

  16. Crandall C . Do heavy-weight students have more difficulty paying for college? Pers Social Psych Bull 1991; 17: 606–611.

    Article  Google Scholar 

  17. Crandall C . Prejudice against fat people: ideology and self-interest. J Pers Soc Psychol 1994; 66: 882–894.

    Article  CAS  Google Scholar 

  18. Lee J . Racial and ethnic achievement gap trends: reversing the progress toward equality. Educ Researcher 2002; 31: 3–12.

    Article  Google Scholar 

  19. DHHS. Physical Activity and Good Nutrition: Essential Elements to Prevent Chronic Diseases and Obesity. DHHS: Atlanta, GA, 2007 (accessed 15 February 2008).

  20. Kaufman A, McLean J, Reynolds C . Sex, race, region, and education differences on the 11 WAIS-R subtests. J Clin Psychol 1988; 44: 231–248.

    Article  CAS  Google Scholar 

  21. Bogg T, Roberts B . Conscientiousness and health-related behaviors: a meta-analysis of the leading behavioral contributors to mortality. Psychol Bull 2004; 130: 887–919.

    Article  Google Scholar 

  22. Kern M, Freidman H . Do conscientious individuals live longer? A quantitative review. Health Psychol 2008; 27: 505–512.

    Article  Google Scholar 

  23. Noftle E, Robins R . Personality predictors of academic outcomes: big five correlates of GPA and SAT scores. J Pers Soc Psychol 2007; 93: 116–130.

    Article  Google Scholar 

  24. Ball K, Crawford D, Kenardy J . Longitudinal relationships among overweight, life satisfaction, and aspirations in young women. Obes Res 2004; 12: 1019–1030.

    Article  Google Scholar 

  25. Strauss R . Childhood obesity and self-esteem. Pediatrics 2000; 105: 1–5.

    Article  Google Scholar 

  26. Shin H . School Enrollment–Social and Economic Characteristics of Students: October 2003. US Department of Commerce: Washington, DC, 2005 (accessed 11 April 2008).

  27. Schmitt N, Schmitt D, Clapham C . Developing and exploring the behaviour of two new versions of the Vocabulary Levels Test. Language Testing 2001; 18: I55–I88.

    Article  Google Scholar 

  28. Elgar F, Roberts C, Tudor-Smith C, Moore L . Validity of self-reported height and weight and predictors of bias in adolescents. J Adolesc Health 2005; 37: 371–375.

    Article  Google Scholar 

  29. Onis M, Onyango A, Borghi E, Siyam A, Nishidaa C, Siekmanna J . Development of a WHO growth reference for school-aged children and adolescents. Bull World Health Organ 2007; 85: 660–667.

    Article  Google Scholar 

  30. MacCann C, Duckworth A, Roberts R . Empirical identification of the major facets of conscientiousness. Learn Individ Differ 2009; 19: 451–458.

    Article  Google Scholar 

  31. Huebner E . Initial development of the Students’ Life Satisfaction Scale. School Psychol Int 1991; 12: 231–243.

    Article  Google Scholar 

  32. Cohen J . Statistical Power Analysis for the Behavioral Sciences 2nd edn. Lawrence Erlbaum Associates: Hillsdale, NJ, 1988.

    Google Scholar 

  33. Ekstrom R, French J, Harman H, Derman D . Manual for Kit of Factor-Referenced Cognitive Tests. ETS: Princeton, NJ, 1976.

    Google Scholar 

  34. Lee K, Ashton M . The HEXACO Personality Inventory: a new measure of the major dimensions of personality. Multivariate Behav Res 2004; 39: 329–358.

    Article  Google Scholar 

  35. Lipnevich A, MacCann C, Bertling J, Naemi B, Roberts R . Emotional reactions toward school situations: relationships with academic outcomes. J Psychoeduc Assess 2012 (in press).

  36. McGrew K . CHC theory and the human cognitive abilities project: standing on the shoulders of the giants of psychometric intelligence research. Intelligence 2009; 37: 1–10.

    Article  Google Scholar 

  37. Latner J, Stunkard A . Getting worse: the stigmatization of obese children. Obes Res 2003; 11: 452–456.

    Article  Google Scholar 

  38. Strauss R, Pollack H . Social marginalization of overweight children. Arch Pediatr Adolesc Med 2003; 157: 746–752.

    Article  Google Scholar 

  39. Jussim L, Harber K . Teacher expectations and self-fulfilling prophecies: knowns and unknowns, resolved and unresolved controversies. Pers Soc Psychol Rev 2005; 9: 131–155.

    Article  Google Scholar 

  40. Taras H, Potts-Datema W . Obesity and student performance at school. J Sch Health 2005; 75: 291–295.

    Article  Google Scholar 

  41. Goodman E, Whitaker R . A prospective study of the role of depression in the development and persistence of adolescent obesity. Pediatrics 2002; 110: 497–504.

    Article  Google Scholar 

Download references

Acknowledgements

We thank Brent Bridgeman and Cathy Wendler for insightful comments on a previous version of this manuscript.

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All statements expressed in this article are of the authors and do not reflect the official opinions or policies of the University of Sydney or the Educational Testing Service.

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Correspondence to C MacCann.

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MacCann, C., Roberts, R. Just as smart but not as successful: obese students obtain lower school grades but equivalent test scores to nonobese students. Int J Obes 37, 40–46 (2013). https://doi.org/10.1038/ijo.2012.47

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  • DOI: https://doi.org/10.1038/ijo.2012.47

Keywords

  • academic achievement
  • conscientiousness
  • well-being
  • prejudice

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