Orthorexia nervosa (ON) represents a pathological obsession with healthy eating, characterized by an excessive focus on the quality, origin, and purity of food. The aim of this masters thesis was to determine the prevalence of ON among Slovenian ski jumpers and to examine the influence of gender, age, and athletic performance on the occurrence of this eating disorder. The research was conducted in cooperation with the Ski Association of Slovenia and included 47 athletes of different age categories and competition levels. Data were collected using a demographic questionnaire and the validated ORTO-15 questionnaire, where a score below 35 points was used as the cut-off value indicating orthorexic behavior. The results showed that the prevalence of orthorexia nervosa among Slovenian ski jumpers was 27.7%, which does not differ significantly from the expected value of 30%. No statistically significant differences were found with regard to gender, age group, or competitive success. Nevertheless, the results indicate that orthorexia nervosa is also present among athletes engaged in sports where body weight plays an important role in performance. Therefore, further awareness-raising and the inclusion of clinical sports nutrition and mental health professionals in the sports environment are recommended.
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