Jurnal Media Gizi Indonesia (MGI)
Vol. 21 No. 4 (2026): MEDIA GIZI INDONESIA

Orthorexia Nervosa Prevalence among Medical Students: A Study Using the TON-17 Scale

Yüksel Duygu Altıparmak (Yeditepe University Faculty of Medicine, Istanbul)
Ülkü Sur Ünal (Marmara University Faculty of Medicine, Istanbul)
Tümay Sadıkoğlu (Yeditepe University Faculty of Medicine, Istanbul)



Article Info

Publish Date
30 Oct 2026

Abstract

Background: Orthorexia Nervosa (ON) is an eating disorder defined as an obsession with healthy eating. Medical students may be at increased risk due to increased nutritional knowledge. Methods: This cross-sectional study was completed between September 2024 until June 2025 at a university in Istanbul with 128 medical students. ON tendencies were assessed using the Test of Orthorexia Nervosa-17 (TON-17). Sociodemographic data, smoking status, history of chronic disease, and body mass index (BMI) were also assessed. Results: The mean total TON-17 score was 43.4 ± 8.9, placing the sample in the "at-risk" category. According to clinical cut-off values, 1,6% of students met the criteria for diagnostic ON. A significant negative correlation was identified between BMI and Focus on Healthy Eating (p < 0.05). Regression analysis revealed that non-smokers were 1.6 times more prone to developing a healthy eating obsession, whereas living with family served as a protective factor, reducing the risk by 1.6 times (p < 0.05). Conclusion: Although the prevalence of diagnostic ON was low, medical students demonstrated subclinical orthorexic tendencies trends. These findings highlight the necessity of using psychometrically robust tools like TON-17 for accurate assessment and the potential need for targeted lifestyle counseling for high-risk student groups.

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