Interoceptive Confusion and Alexithymia: Transdiagnostic Links to Eating Spectrum Symptoms in a Non-Clinical Young Adults’ Sample

Background: Inadequate management of emotional responses, limited access to emotion regulation strategies, and difficulties in emotion regulation may co-occur with alexithymic traits and interoceptive inaccuracy or confusion. These dimensions may influence lifetime eating disorder spectrum manifestations. Objective: To assess, in a general population sample without Axis I psychiatric disorders, alexithymic traits, interoceptive confusion/inaccuracy, and difficulties in emotion regulation, and to explore their associations with eating disorder spectrum manifestations. Method: In this cross-sectional observational study, fifty-two participants aged 18–30 years, recruited via a university bulletin board, were assessed online using the Toronto Alexithymia Scale (TAS-20), Interoceptive Accuracy Scale (IAS), Interoceptive Confusion Questionnaire (ICQ), Eating Attitude Test (EAT-26), and Difficulties in Emotion Regulation Scale (DERS) (protocol #01/2025). Results: Interoceptive confusion (ICQ) showed significant positive correlations with TAS-20, DERS, and EAT-26 total scores. ICQ scores were associated with TAS-20 subscales ‘difficulty identifying feelings’ (DIF) and ‘difficulty describing feelings’ (DDF). Participants with TAS-20 scores > 51 (n = 35; 67.3%) had significantly higher EAT-26 scores on ‘dieting’ (p = 0.043) and ‘bulimia’ (p = 0.017), as well as higher ICQ (p = 0.001) and DERS (p = 0.001) total scores, with smaller differences in the DERS ‘impulse’ subscale (p = 0.037). Conclusions: Preliminary findings suggest a pattern of co-occurring traits characterized by alexithymia, interoceptive confusion, emotional dysregulation, impulsivity, and eating disorder spectrum features, supporting the study hypothesis.