Impaired interoceptive function represents an important variable in the psychopathology of anorexia nervosa (AN) and is thought to be influenced by maladaptive schemas grounded on early intimate interactions. However, the role of the different psychological processes involved in the interoceptive function has been poorly assessed in AN. We aimed to investigate the associations between adult insecure attachment, interoceptive processes, and psychopathology. One hundred and fifty participants with AN completed self-report questionnaires: the Multidimensional Assessment of Interoceptive Awareness, which measures interoception dimensions; the Attachment Style Questionnaire, assessing adult attachment styles, and the Eating Disorder Inventory-2, exploring eating-related core symptoms. Pearson's correlations were employed to assess the relationships between MAIA and EDI-2 subscores. Structural equation models (SEM) were performed to investigate the relationships between insecure attachment dimensions, interoception, and AN core symptoms as latent variables. Body listening, self-regulating, and trusting were interoceptive dimensions associated with eating psychopathology. As confirmed by an exploratory factor analysis, these interoceptive dimensions are included in a latent variable which points to "confidence" in body sensations. SEM showed that insecure, in particular anxious, attachment predicts body "confidence" and, in turn, AN core symptoms. Confidence in body sensations as a trustworthy source of knowledge represents the specific interoceptive dimension associated with psychopathology in AN. In accordance with Bruch's model of AN, insecure attachment patterns may promote a need to validate inner experiences by external sources conferring vulnerability to symptomatology. These psychopathological pathways could be addressed in clinical interventions.