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Prevalence of orthorexia nervosa is less than 1 %: data from a US sample



Orthorexia nervosa, or pathological dieting based on being “healthy,” has been of growing interest. Clinical data are limited to less than a half-dozen case studies reporting instances of medical problems due to healthful eating. However, more than a dozen studies using a measure to identify orthorexia, the ORTO-15, report very high prevalence rates in non-clinical samples. Point prevalence rates are reported from 6 % to nearly 90 %. Such variability could be due to cultural issues or psychometric problems with the instrument. This study examines prevalence rate of orthorexia in a US sample.


The ORTO-15 was administered to 275 US college students along with other questions regarding diet, exercise, and health.


While the ORTO-15 indicated a prevalence rate of 71 %, only 20 % of the sample endorsed a dietary practice of removing a particular food type (e.g. meat) from their diet. Those who endorsed following a vegan diet had the highest (less pathological) mean ORTO-15 score. Further, when classifying participants based on their seriousness about healthy eating and whether their diet had led to impairment in everyday activities and medical problems, less than 1 % of the sample fell into such a category.


As in other countries, a large proportion of a non-clinical US sample scored in the orthorexia range on the ORTO-15. However, this instrument is likely unable to distinguish between healthy eating and pathologically healthful eating. Our estimate is that orthorexia nervosa like anorexia nervosa and bulimia nervosa, is not a common condition.

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  1. Brytek-Matera et al. [15] refer to the ORTO-15 as the “ORTHO-15” and do not give an explanation as to why. It is possible that this is an issue with translation.


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The authors wish to acknowledge Peter Ray Concepcion for his assistance in data collection.

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Correspondence to Thomas M. Dunn.

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The authors disclose that we have no conflicts of interest with this research and are not receiving any consideration with this work.

Ethical approval

Prior to data collection, this study was approved by our university’s institutional review board for the ethical treatment of human participants in research. The project was given “exempt” status.

Informed consent

All participants read informed consent statements. As our study consisted solely of anonymous questionnaires, and a signed consent statement would be the sole way to identify participants, they provided consent by taking the anonymous questionnaire.

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Dunn, T.M., Gibbs, J., Whitney, N. et al. Prevalence of orthorexia nervosa is less than 1 %: data from a US sample. Eat Weight Disord 22, 185–192 (2017).

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  • Orthorexia nervosa
  • ORTO-15
  • Eating disorders
  • Pathological healthful eating