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Open Access Research article

Relationship between perceived body weight and body mass index based on self- reported height and weight among university students: a cross-sectional study in seven European countries

Rafael T Mikolajczyk12, Annette E Maxwell3*, Walid El Ansari4, Christiane Stock5, Janina Petkeviciene6 and Francisco Guillen-Grima78

Author Affiliations

1 Department of Public Health Medicine, School of Public Health, University of Bielefeld, Bielefeld, Germany

2 Department of Clinical Epidemiology, Bremen Institute for Prevention Research and Social Medicine, Bremen, Germany

3 School of Public Health and Jonsson Comprehensive Cancer Center, 650 Charles Young Dr. South, Los Angeles, CA 90095-6900, University of California, Los Angeles, USA

4 Faculty of Sport, Health & Social Care, University of Gloucestershire, Gloucester, UK

5 Unit for Health Promotion Research, University of Southern Denmark, Esbjerg, Denmark

6 Preventive Medicine Department, Institute for Biomedical Research, Kaunas University of Medicine, Kaunas, Lithuania

7 Department of Health Sciences, Public University of Navarra, Pamplona, Spain

8 Department of Preventive Medicine and Public Health, University Clinic of Navarra, Pamplona, Spain

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BMC Public Health 2010, 10:40  doi:10.1186/1471-2458-10-40

Published: 27 January 2010

Abstract

Background

Despite low rates of obesity, many university students perceive themselves as overweight, especially women. This is of concern, because inappropriate weight perceptions can lead to unhealthy behaviours including eating disorders.

Methods

We used the database from the Cross National Student Health Survey (CNSHS), consisting of 5,900 records of university students from Bulgaria, Denmark, Germany, Lithuania, Poland, Spain and Turkey to analyse differences in perceived weight status based on the question: "Do you consider yourself much too thin, a little too thin, just right, a little too fat or much too fat?". The association between perceived weight and body mass index (BMI) calculated from self-reported weight and height was assessed with generalized non-parametric regression in R library gam.

Results

Although the majority of students reported a normal BMI (72-84% of males, 65-83% of females), only 32% to 68% of students considered their weight "just right". Around 20% of females with BMI of 20 kg/m2 considered themselves "a little too fat" or "too fat", and the percentages increased to 60% for a BMI of 22.5 kg/m2. Male students rarely felt "a little too fat" or "too fat" below BMI of 22.5 kg/m2, but most felt too thin with a BMI of 20 kg/m2.

Conclusions

Weight ideals are rather uniform across the European countries, with female students being more likely to perceive themselves as "too fat" at a normal BMI, while male students being more likely to perceive themselves as "too thin". Programs to prevent unhealthy behaviours to achieve ill-advised weight ideals may benefit students.