ARFID: What the Research Currently Tells Us

By Kylie Gallaher, Clinical Hypnotherapist | Newcastle Clinical Hypnotherapy

Avoidant Restrictive Food Intake Disorder, commonly referred to as ARFID, is often misunderstood.  It is frequently minimised as extreme picky eating, misattributed to anxiety alone, or approached as a behavioural issue that can be corrected with enough exposure, discipline or pressure.

For many families and adults, there is an understanding that evolved from within their experiences, though, that is in contrast to prevailing frameworks or advice.  They noticed that pressure, exposure, and compliance-focused approaches were increasing distress, shutdown, avoidant behaviours, or withdrawal, rather than building capacity.

Based on these experiences, many consciously chose a different path, even when that choice ran counter to recommended approaches.  This often left them even more isolated from others, trapped in the experience of ARFID, but also deterred from even looking for forms of support that genuinely facilitate change.

What has shifted more recently is that research is now beginning to reflect and validate these lived conclusions.  This emerging alignment between experience and research matters.

Although ARFID was formally recognised in the DSM-5 in 2013, clinicians have long worked with individuals whose eating patterns are shaped by fear, sensory processing differences, and physiological threat responses, rather than concerns about weight or appearance (American Psychiatric Association, DSM-5-TR).

In my practice at Newcastle Clinical Hypnotherapy, research is an important guide, but it is never separated from lived experience, because it was lived experience that first revealed where existing models were falling short.

It is therefore even more important to stay abreast of understanding what the research clearly establishes, and where it remains incomplete.

This article explores what current research tells us about ARFID, and what it continues to reveal about the limitations of traditional treatment models.

Understanding ARFID Beyond Behaviour

ARFID is defined as an eating and feeding disorder characterised by persistent restriction or avoidance of food intake resulting in one or more of the following consequences: nutritional deficiency, medical compromise, reliance on supplements, or significant psychosocial interference.  Crucially, this restriction is not driven by body image or weight concerns, distinguishing ARFID from anorexia nervosa and bulimia nervosa (DSM-5-TR).

Research consistently identifies three broad drivers of ARFID presentations.  These include (a) sensory sensitivity to food characteristics such as texture, taste, smell, or appearance, (b) a lack of interest in eating or food, and (c) fear of adverse consequences such as choking, vomiting, or gastrointestinal distress (Zickgraf & Elkins, 2018; Harshman et al., 2019).

Importantly, these drivers rarely occur in isolation.  Many individuals experience overlapping patterns, which contributes to the complexity of assessment and treatment (Bryant-Waugh et al., 2023).

ARFID is now recognised across the lifespan.  While much of the research has focused on children and adolescents, adult ARFID is increasingly documented, often following years of misdiagnosis or accommodation rather than appropriate treatment (Cooney et al., 2018).

How Common Is ARFID?

Estimating the prevalence of ARFID has proven challenging.  Studies report prevalence rates ranging from under one percent to over ten percent, depending on diagnostic criteria, assessment tools, and population samples (Nicholls Clow et al., 2024).

A 2024 systematic review and meta-analysis concluded that methodological inconsistency significantly influences reported prevalence, reinforcing the need for clearer diagnostic pathways and standardised assessment practices (Nicholls Clow et al., 2024).

Despite this variability, research consistently indicates that ARFID is not rare and is likely under-recognised, particularly in adults and in individuals whose weight remains within expected ranges, often described as “normal”, despite the limitations of that language (Bryant-Waugh et al., 2023).

A Highly Individual Presentation

One of the strongest themes across the literature is the heterogeneity of ARFID.  In other words, the diagnosis may be shared, but the experience rarely is.  Individuals who meet the same criteria can have very different relationships with food, physiological responses, and levels of distress, a reality that has important implications for how ARFID is understood, assessed, and treated.

Research highlights frequent overlap between ARFID and anxiety disorders, neurodevelopmental differences, trauma histories, and gastrointestinal conditions (Kambanis et al., 2020; Harshman et al., 2019).  These overlaps help explain why symptom focused or purely behavioural approaches often fail to address the underlying drivers of restriction and avoidance.

Clinical reviews consistently emphasise that ARFID cannot be understood as a single condition with a single pathway to recovery.  For many families, adults, and clinicians, this reflects what has been evident through experience long before it was articulated so clearly in the literature (Cardinal & Antunes, 2024, Kennedy et al, 2023).

Assessment and Identification Challenges

Over the past decade, multiple assessment tools have been developed to support ARFID identification.  However, there remains no universally accepted gold standard diagnostic instrument (Bryant-Waugh et al., 2023, Kennedy et al, 2023).

Research indicates that ARFID is frequently overlooked in both primary care and specialist settings.  It may be dismissed as picky eating, mislabelled as anxiety, or attributed solely to gastrointestinal dysfunction, particularly when weight is stable or growth appears adequate (Bryant-Waugh et al., 2023).

When weight remains stable or growth appears appropriate within those ‘normal’ ranges, the absence of overt medical compromise can create a false sense of safety.  This can obscure the severity of eating-related distress and functional impairment, biasing assessment toward reassurance or delay.  For many families, this becomes a barrier to being taken seriously, with ARFID more readily framed as developmental or behavioural rather than as a disorder requiring careful, mechanism-aligned assessment.  In these contexts, clinical responses often shift toward behavioural enforcement or exposure, rather than addressing the fear, sensory threat, or physiological danger that maintains restriction.

Complicating this further, nutritional pathology may not be immediately apparent, or may appear deceptively normal on standard testing.  In some cases, abnormalities such as iron deficiency are identified and treated in isolation through supplementation, without recognition of the restrictive eating patterns driving the deficiency in the first place.  While this can temporarily stabilise biochemical markers, it may inadvertently reinforce the impression that risk has been resolved, leaving the underlying eating-related threat unaddressed.  This separation of nutritional markers from eating behaviour reflects the same fragmentation seen elsewhere in ARFID care, where symptoms are managed without addressing the mechanisms that sustain them.

Adult presentations are especially likely to be missed, with many adults reporting long histories of food-related distress without ever receiving an accurate diagnosis (Cooney et al., 2018).  More than a decade after ARFID’s inclusion in the DSM, researchers continue to call for improved diagnostic clarity and clinician education, particularly in recognising presentations where medical risk is less visible but functional, psychological and psychosocial burden remains high (Bryant-Waugh et al., 2023).

What the Research Says About Treatment

Treatment research for ARFID remains in its early stages.  Most studies support multidisciplinary care involving medical monitoring, nutritional support, and psychological intervention (Katzman et al., 2021).

Adapted cognitive behavioural approaches, such as CBT-AR, show promise within structured programs, particularly in specialist settings (Thomas & Eddy, 2019).  However, outcome studies remain limited, and there is no universally accepted evidence-based treatment pathway (Thomas et al., 2021).

Reviews consistently note that many individuals do not respond to standardised protocols (such as CBT-AR), particularly when treatment focuses on behavioural change without addressing fear, sensory processing differences, or physiological stress responses (Thomas et al., 2021).

This aligns with growing recognition that for many individuals with ARFID, change does not begin with food.  It begins with safety.

Where the Research Is Still Catching Up

Despite increasing recognition of ARFID, significant and well-documented gaps remain in the literature (Kennedy et al, 2023).  Neurobiological mechanisms are still poorly understood.  Long term outcome data is limited.  Adult populations remain underrepresented in research samples (Cardinal & Antunes, 2024, Kennedy et al, 2023).

For many individuals, families, and clinicians, these gaps are not abstract.  They reflect long-standing experiences of having to make careful judgements in the absence of both a robust research base and accessible, mechanism-aligned models of care, particularly beyond childhood.  In practice, this has often meant working ahead of what the research could clearly articulate and what formal services were able to offer.  This position can further isolate people from clinical support and social recognition, and that isolation is not neutral.  Over time, it can carry its own consequences, shaping how distress is interpreted, legitimised, or dismissed, and influencing whether meaningful support is available at all.

There is, however, growing acknowledgement that behavioural models alone cannot fully account for ARFID.  Emerging research increasingly highlights the role of the nervous system, threat perception, and safety-based avoidance patterns in shaping eating behaviour (Cardinal & Antunes, 2024).  This shift aligns closely with what many have observed clinically and experientially: that restriction is not simply maintained by habit or belief, but by deeply embedded physiological responses organised around protection.

Taken together, these findings reinforce the need for continued research, alongside clinical approaches that are responsive to the complexity of each individual presentation.  They also underscore the limitations of relying on models that prioritise behaviour change without first addressing the conditions of safety required for that change to occur.

What This Means in Practice

Current research clearly establishes ARFID as a serious and complex eating disorder that presents in highly individual ways.  It highlights both the limitations of rigid, one-size-fits-all treatment models and the importance of approaches that prioritise safety, regulation, and collaboration over compliance alone.  In application, not just theory.

Taken together, the literature does not point to a single pathway to recovery.  Instead, it reinforces the need for assessment and treatment approaches that are responsive and adaptive to mechanism, context, and individual experience.  Importantly, the research increasingly reflects what many individuals, families, and clinicians have long observed: that eating patterns in ARFID are not arbitrary or oppositional, but protective responses organised around safety.

At Newcastle Clinical Hypnotherapy, my work with clients is informed by this evolving evidence base while remaining grounded in lived experience.  As understanding of ARFID continues to develop, so too does the importance of meeting individuals where they are, recognising the protective role their eating patterns have played, and working in ways that restore safety rather than override it.

What the research increasingly makes clear is that ARFID is not defined by inevitability.  When care begins with safety, respects individual mechanisms, and unfolds at the pace the nervous system requires, meaningful change in a person’s relationship with food and eating is possible.  This understanding is reinforced not only in the literature, but in my lived and clinical experience, where freedom from ARFID has been achievable through a committed, collaborative process that meets each person exactly where they are, rather than through force, urgency, or fixed formulas.  And moves with them, supporting growth in safety in relationships with food and eating, that builds capacity, confidence and freedom of choice.

Further information about ARFID and how it is approached in practice at Newcastle Clinical Hypnotherapy can be found here.

Book your Newcastle Clinical Hypnotherapy session today

References

American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.; DSM-5-TR). American Psychiatric Publishing.

Bryant-Waugh, R., Loomes, C., Munuve, A., & Rhind, C. (2023). Assessment and treatment of avoidant/restrictive food intake disorder ten years after DSM-5. Journal of Eating Disorders.

Cardinal, T., & Antunes, C. (2024). Clinical heterogeneity and future directions in avoidant/restrictive food intake disorder. Clinical Psychology Review.

Cooney, M., et al. (2018). Avoidant/restrictive food intake disorder in adults: A clinical review. Clinical Case Studies, 17(6), 443–452.

Harshman, S. E., et al. (2019). Avoidant/restrictive food intake disorder and gastrointestinal disorders: Clinical overlap and implications for treatment. Journal of Pediatric Gastroenterology and Nutrition.

Kambanis, P. E., et al. (2020). Neurodevelopmental correlates of avoidant/restrictive food intake disorder. Journal of Neurodevelopmental Disorders.

Katzman, D. K., et al. (2021). Medical complications and comorbidities in avoidant/restrictive food intake disorder. Current Opinion in Pediatrics.

Kennedy, H.L., Hitchman, L.M., Pettie, M.A., Bulik, C.M., Jordan, J. 2023. Avoidant/restrictive food intake disorder (ARFID) in New Zealand and Australia: a scoping review. Journal of Eating Disorders.

Nicholls, K., & Clow, K. (2024). Prevalence of avoidant/restrictive food intake disorder: A systematic review and meta-analysis. Appetite.

Thomas, J. J., & Eddy, K. T. (2019). Cognitive-behavioral therapy for avoidant/restrictive food intake disorder: Children, adolescents, and adults. Cambridge University Press.

Thomas, J. J., et al. (2021). Mechanisms of change in treatment for avoidant/restrictive food intake disorder. International Journal of Eating Disorders.

Zickgraf, H. F., & Elkins, A. (2018). Sensory sensitivity and avoidant/restrictive food intake disorder. Appetite.

Research Reviewed and How It Informs This Article