Key Takeaways

• Autism and eating disorders frequently co-occur. A significant portion of individuals with eating disorders also meet criteria for autism, yet screening is often inconsistent.
• Shared traits can complicate diagnosis. Sensory sensitivity, rigidity, and interoceptive differences can mask or mimic eating disorder symptoms.
• ARFID and feeding differences require careful distinction. Understanding the function and impact of eating behaviors is key to accurate diagnosis and treatment planning.
• Neurodiversity-affirming care improves engagement. Structured, individualized approaches that incorporate sensory and communication needs support better outcomes.
• Inclusive care must address systemic barriers. Marginalized populations face additional challenges in diagnosis and access, requiring more culturally responsive care. 

Autism and eating disorders: improving diagnosis and care

In this continuing education webinar, Autism and Eating Disorders: Challenges, Diagnosis, and Neurodiversity-Affirming Treatment, Nicole Christian-Brathwaite, MD, National Medical Director at Monte Nido, and Brittany Kiss, MS, RDN, LDN, Nutrition Manager at Monte Nido Walden, explored the clinical overlap between autism and eating disorders, common diagnostic challenges, and practical strategies for delivering neurodiversity-affirming care.

Eating disorders and autism frequently co-occur, yet this intersection is often misunderstood or missed. Differences in sensory processing, cognition, and communication can shape how eating disorders present, how they are assessed, and how treatment is experienced. Without this understanding, individuals may be misdiagnosed or receive care that does not fully meet their needs.

The overlap between autism and eating disorders

Autism is significantly overrepresented in eating disorder populations, with important implications for diagnosis and treatment planning.

Key findings include:

• Up to 30% of individuals in eating disorder populations may meet criteria for autism 
• Eating disorders are frequently missed in autistic individuals Approximately:
  
  • 1 in 6 children with ARFID have autism
  • 1 in 10 children with autism meet criteria for ARFID
     
• Individuals with eating disorders often show higher rates of autistic traits compared to controls

Additional research supports this relationship:

• Autism diagnosis present in about 16% of individuals with ARFID 
• Autism and autistic traits present in:
  
  • 16.3% of individuals with anorexia nervosa
  • 12.5% of individuals with ARFID

These findings point to a meaningful and statistically significant co-occurrence between autism and eating disorders. Despite this, screening for autism is not always standard in eating disorder care.

Shared traits of autism and eating disorders that shape clinical presentation

Autism and eating disorders share several overlapping traits that can complicate diagnosis and influence how symptoms present.

Common shared features include:

• Sensory sensitivity
• Cognitive rigidity
• Interoceptive differences
• Gastrointestinal concerns
• Executive functioning challenges
• Anxiety

Because of this overlap, behaviors may be misattributed to one condition rather than understood in context. This can delay diagnosis or lead to incomplete treatment planning.

Clinically, individuals with co-occurring autism and eating disorders may also:

• Remain in treatment longer
• Experience more prolonged recovery
• Require both increased structure and flexibility

Distinguishing feeding differences from eating disorders

A critical diagnostic challenge is differentiating autism-related feeding patterns from eating disorders. While these presentations may appear similar, their clinical implications differ significantly.

Picky or selective eating may include:

• Limited variety
• Strong texture or flavor preferences
• Brand-specific foods
• Food neophobia

These behaviors may:

• Disrupt routines
• Reflect developmental stages
• Resolve without intervention
• Occur without nutritional deficiency

In contrast, ARFID involves more significant clinical impact, including:

• Nutritional deficiency
• Weight loss or disrupted growth
• Reliance on supplements or enteral nutrition
• Impaired psychosocial functioning

ARFID is not driven by body image concerns and is not better explained by another condition.

ARFID subtypes

ARFID presentations are often grouped into three patterns:

• Sensory avoidance: avoidance based on texture, taste, or smell
• Fear of aversive consequences: fear of choking, vomiting, or GI distress
• Lack of interest: low appetite or limited motivation to eat

These subtypes often overlap with autism-related traits such as sensory sensitivity, rigid thinking, and interoceptive differences. Understanding the function of behaviors is key to accurate diagnosis.

How eating disorders may present differently in autism

Eating disorders may present differently in autistic individuals, particularly in anorexia nervosa. These differences can contribute to missed or delayed diagnoses.

Common patterns include:

• Less verbalization of body image concerns
• Rule-based restriction
• Rigid thinking around food
• Social eating avoidance
• Focus on “healthy” eating

Additional features may include:

• Sensory sensitivities
• Ritualized eating
• Slow eating or micro-biting
• Perfectionism
• Body change discomfort

These behaviors are sometimes attributed solely to autism, rather than recognized as eating disorder symptoms.

Differences in binge eating and purging

Binge eating and purging behaviors may also differ from typical presentations.

Examples include:

• Repetitive bingeing on “safe foods”
• Sensory-driven eating
• Reduced awareness of fullness
• Less guilt or secrecy

Purging behaviors may be:

• Triggered by sensory discomfort
• Driven by anxiety or rigidity
• Not primarily related to weight or shape

Recognizing these differences is essential for accurate assessment and care.

Neurodiversity-affirming eating disorder treatment approaches

Treatment must be adapted to support engagement while maintaining core recovery goals. The primary goal remains adequate and consistent nutritional intake, but the approach should reflect individual needs.

Key principles include:

• Understanding the function of behaviors
• Using clear, literal communication
• Providing predictable structure
• Balancing flexibility with treatment goals
• Avoiding assumptions about motivation

Practical adaptations

Adaptations that support engagement include:

Visual supports

• Plate-by-plate visuals
• Written reminders
• Visual schedules

Consistent routines

• Predictable session timing
• Structured meals
• Clear expectations

Gradual exposure

• Stepwise introduction of new foods
• Repeated practice

Sensory accommodations

• Headphones
• Temperature adjustments
• Sensory tools

Individualized coaching

• Literal communication
• Simplified instructions

These strategies should support progress rather than reinforce avoidance.

Balancing flexibility with ED recovery

A central challenge in treatment is determining when to accommodate and when to challenge. Both extremes can impact outcomes.

Accommodations may:

• Reduce anxiety
• Increase short-term intake
• Improve engagement

But may also:

• Maintain nutritional deficiencies
• Reinforce rigid patterns
• Limit social participation

Pushing too quickly may:

• Increase distress
• Reduce intake
• Decrease engagement

Effective care requires balance, including:

• Gradual exposure
• Collaboration with the client
• Support for autonomy
• Opportunities for social engagement

Considerations for diverse populations

Autistic individuals from marginalized communities often face additional barriers to diagnosis and care.

LGBTQIA+ individuals

Eating behaviors may be closely tied to identity and body autonomy.

Considerations for LGBTQIA+ individuals include:

• Higher rates of autism and eating disorders
• Restriction related to gender dysphoria
• Increased mental health risk

Clinical care should:

• Explore identity and body goals
• Avoid assumptions about weight concerns
• Affirm identity
• Collaborate with gender-affirming care

People of color

People of color are less likely to be diagnosed but often present with greater medical severity.

Barriers to treatment for People of color include:

• Underdiagnosis and delayed care
• Cultural food misinterpretation
• Weight bias
• Limited access to specialty care

Best practices include:

• Screening all patients
• Asking culturally relevant questions
• Considering social determinants of health
• Using inclusive language

Supporting recovery across levels of care

Eating disorder treatment must be adapted across levels of care while maintaining structure and consistency.

Examples include:

• Outpatient: maintain familiar routines
• PHP/IOP: increase structure and exposures
• Residential: provide structured support
• Inpatient: prioritize stabilization and clear communication

Across all levels:

• Meet clients where they are
• Use exposure-based approaches
• Maintain predictability
• Balance safety with progress

Moving toward more inclusive care

The intersection of autism and eating disorders challenges traditional diagnostic and treatment approaches. Recognizing this overlap supports earlier identification, more accurate diagnosis, and more effective care.

Neurodiversity-affirming treatment is not about lowering expectations. It is about removing barriers that prevent individuals from engaging in care and achieving recovery.

For clinicians, this work requires ongoing education, flexibility, and a commitment to individualized care. As awareness continues to grow, more inclusive approaches can help ensure that individuals with co-occurring autism and eating disorders are recognized and supported throughout treatment.

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