Co-Occurrence of Avoidant/Restrictive Food Intake Disorder (ARFID) and Schizophrenia-Spectrum Disorders: A...

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Avoidant/restrictive food intake disorder (ARFID) and psychotic disorders are distinct but can co-occur, complicating diagnosis and treatment.
• ARFID involves food avoidance due to sensory issues, fear, or low appetite, without body image concerns.
• Psychosis is marked by hallucinations, delusions, negative symptoms, and cognitive deficits.

Purpose of the Study:

• To explore shared mechanisms between ARFID and psychotic disorders.
• To understand how these conditions influence each other and blur diagnostic boundaries.
• To highlight the need for systematic investigation and integrated treatment approaches.

Main Methods:

• Literature review examining shared mechanisms and case reports.
• Analysis of potential converging pathways such as pathological avoidance.
• Identification of overlapping symptoms like sensory sensitivities and interoception abnormalities.

Main Results:

• Shared mechanisms include pathological avoidance stemming from sensory overstimulation, obsessive-compulsive traits, or delusions.
• Psychosis can mimic ARFID, worsen food avoidance, and malnutrition can precipitate psychosis.
• Abnormalities in interoception and sensory processing are common to both conditions.

Conclusions:

• Systematic investigation is essential due to limited empirical studies and reliance on case reports.
• Clarifying shared mechanisms and refining differential diagnosis are necessary.
• Personalized treatment approaches are recommended for patients with comorbid ARFID and psychosis.