# Avoidant/Restrictive Food Intake Disorder (ARFID)

## Overview

ARFID is a DSM-5 feeding and eating disorder characterized by a persistent failure to meet nutritional and/or energy needs that is not driven by body image concerns or a desire to lose weight. This distinguishes it fundamentally from anorexia nervosa. Three recognized presentations have been described: lack of interest in eating or low appetite, sensory sensitivity to food characteristics, and fear of aversive consequences of eating. Prevalence in pediatric populations referred to feeding clinics is estimated at 1-5%, though the true population prevalence is less well established. ARFID frequently co-occurs with ASD, anxiety disorders, and ADHD. It can cause significant nutritional deficiency, weight loss, growth faltering, and psychosocial impairment. Treatment approaches are still evolving, with CBT-AR (CBT for ARFID) being the most developed manualized treatment.

## Diagnostic Criteria (DSM-5)

The DSM-5 defines ARFID as an eating or feeding disturbance manifested by persistent failure to meet appropriate nutritional and/or energy needs, associated with one or more of the following: significant weight loss (or failure to achieve expected weight gain or growth in children), significant nutritional deficiency, dependence on enteral feeding or oral nutritional supplements, or marked interference with psychosocial functioning. The disturbance must not be better explained by lack of available food or a culturally sanctioned practice. It must not occur exclusively during the course of AN or BN, and there must be no body image disturbance. The eating disturbance should not be attributable to a concurrent medical condition or mental disorder, unless it exceeds what would be expected from that condition alone.

## Three Presentations

### 1. Lack of Interest in Eating / Low Appetite

Children with this presentation show little interest in food or eating. They are easily satiated and may forget to eat entirely. They are often described as having "never been a big eater" since infancy. Many have poor interoceptive awareness, meaning they have difficulty recognizing their own hunger cues. This presentation can lead to failure to thrive, underweight status, and nutritional deficiency. Symptoms may worsen during periods of stress, illness, or heightened anxiety. It is distinguished from depression-related appetite loss by the absence of other depressive symptoms.

### 2. Sensory Sensitivity to Food

Children with sensory-based ARFID avoid foods based on their sensory properties — texture, color, smell, temperature, appearance, or taste. This represents extremely selective eating, or "picky eating" at the severe end of the spectrum. The diet is typically limited to a small number of accepted foods, often bland, processed, and brand-specific. New foods trigger disgust, gagging, or outright refusal. This presentation is highly prevalent in children with ASD due to sensory processing differences. A child who eats only 5-10 specific foods is a characteristic example. What distinguishes ARFID from normative picky eating is the severity, duration, nutritional impact, and degree of functional impairment.

### 3. Fear of Aversive Consequences

This presentation involves avoidance of eating due to fear of choking, vomiting, pain, or allergic reaction. It is often precipitated by a specific negative experience with food, such as a choking episode, food poisoning, or severe allergic reaction. The anxiety-driven avoidance generalizes beyond the triggering event, leading to progressive dietary restriction and weight loss. The presentation resembles a specific phobia (emetophobia or phagophobia) with an eating-focused manifestation. It is the most responsive of the three presentations to exposure-based treatment.

## Distinguishing ARFID from Anorexia Nervosa

The key distinguishing feature is **body image**: ARFID patients do not have fear of weight gain or body dissatisfaction, while AN patients do. The **desired outcome of restriction** differs: ARFID patients restrict because of disinterest, sensory aversion, or fear of consequences, while AN patients restrict to control weight and shape. Regarding **weight goals**, ARFID patients may actually be distressed by their low weight and want to gain, while AN patients resist weight gain. **Demographically**, ARFID is more common in younger children and males, while AN is more common in adolescent females. **Comorbidity profiles** differ: ARFID tends to co-occur with ASD, anxiety, and ADHD, while AN tends to co-occur with depression, OCD, and perfectionism. Importantly, ARFID can co-occur with AN or evolve into AN if body image concerns emerge over time.

| Feature | ARFID | Anorexia Nervosa |
|---|---|---|
| Body image disturbance | Absent | Present (core feature) |
| Fear of weight gain | Absent | Present |
| Reason for restriction | Disinterest, sensory aversion, or fear of consequences | Weight/shape control |
| Attitude toward low weight | Often distressed; may want to gain | Resists weight gain |
| Typical demographics | Younger children, more males | Adolescent females |
| Common comorbidities | ASD, anxiety, ADHD | Depression, OCD, perfectionism |
| Can co-occur? | Yes; ARFID can evolve into AN if body image concerns emerge |  |

## Comorbidities

**ASD** has very high comorbidity with ARFID, as sensory sensitivities and rigidity contribute to food selectivity. **Anxiety disorders** including GAD, social anxiety, and specific phobias (especially emetophobia) are common. **ADHD** is relevant because appetite suppression from stimulant medication can compound ARFID. **OCD** may overlap through contamination fears and rigidity-driven food avoidance. **Developmental delays** are associated with feeding difficulties broadly. **GI disorders** including functional abdominal pain, nausea, and constipation frequently co-occur and may perpetuate avoidance.

## Assessment

### Clinical Interview

Assessment should include a detailed feeding and dietary history from birth, covering breast or bottle-feeding, introduction of solids, and early feeding difficulties. The current diet should be enumerated: all accepted foods, food preparation requirements, and brand preferences. Any triggering events such as choking, vomiting, or allergic reactions should be explored. Weight trajectory should be reviewed by plotting growth charts and looking for growth faltering or downward crossing of percentiles. Body image concerns should be screened for to rule out AN. Functional impairment should be assessed across domains including avoidance of social eating situations (parties, the school cafeteria, restaurants) and family conflict around meals. Comorbid conditions including ASD, anxiety, and ADHD should be evaluated.

### Medical and Nutritional Assessment

Growth parameters including weight, height, and BMI should be plotted on growth charts. Nutritional labs should include CBC, iron studies, zinc, vitamin D, B12, folate, albumin, and prealbumin. DEXA scanning should be considered if there has been prolonged nutritional deficiency. Medical causes of feeding difficulties such as eosinophilic esophagitis, celiac disease, reflux, food allergies, and dysphagia should be assessed. Referral to pediatric GI is appropriate if significant GI symptoms are present. A dietary analysis by a registered dietitian completes the assessment.

### Rating Scales

The **PARDI (Pica, ARFID, and Rumination Disorder Interview)** is a structured diagnostic interview. The **NIAS (Nine-Item ARFID Screen)** is a brief screening tool that assesses all three presentations. The **Eating Disorder Examination (EDE)** can be used to rule out AN and BN body image concerns.

## Treatment

### CBT-AR (Cognitive Behavioral Therapy for ARFID)

CBT-AR, developed by Thomas and Eddy (2019), is the most developed manualized treatment for ARFID. It consists of 20-30 sessions and is adaptable for children, adolescents, and adults. Four modules are selected based on the patient's presenting profile. The **psychoeducation and self-monitoring** module uses food logs and helps patients understand the maintaining cycle. The **volume module** (for low appetite) addresses scheduled eating, increasing portion sizes, and improving interoceptive awareness. The **variety module** (for sensory sensitivity) involves systematic food exposure using a hierarchy, incorporating new foods gradually, and sensory desensitization. The **fear module** (for fear of aversive consequences) uses exposure and response prevention for feared foods and situations along with cognitive restructuring of catastrophic beliefs. Parents are involved as coaches, especially for younger children.

### Exposure-Based Approaches

Graded exposure to new foods follows a hierarchy: look at the food, touch it, smell it, lick it, taste it, chew it, and swallow it. Systematic desensitization combined with positive reinforcement is the core method. These approaches are particularly effective for the fear-of-consequences and sensory-sensitivity presentations. In-session food exposures with therapist modeling are often necessary.

### Family-Based Approaches

Adapted FBT for ARFID (FBT-ARFID) places parents in charge of introducing new foods and increasing intake. While there is less evidence than for FBT in AN, the approach is conceptually appropriate for younger children. Parent training in behavioral feeding strategies and reduction of mealtime conflict and negative associations with eating are key components.

### Occupational Therapy (for Sensory-Based ARFID)

Sensory integration approaches are used for children with ASD or significant sensory processing differences. Oral-motor therapy may be indicated if dysphagia or motor-based feeding difficulties contribute. The Sequential Oral Sensory (SOS) Approach to Feeding is a multisensory program designed to expand the diet.

### Nutritional Rehabilitation

A registered dietitian should be involved for nutritional supplementation and meal planning. Oral nutritional supplements such as PediaSure or Ensure may be needed to prevent malnutrition while behavioral interventions progress. In severe cases with significant malnutrition, nasogastric or gastrostomy tube feeding may be necessary to bridge nutrition while working toward oral intake. Micronutrient supplementation should be guided by laboratory findings.

### Pharmacotherapy

No medications are FDA-approved for ARFID. **Cyproheptadine**, an antihistamine with appetite-stimulating properties, is commonly used off-label for children with low-appetite ARFID but has limited evidence. **Mirtazapine** offers appetite stimulation along with anxiolytic properties and may help adolescents with comorbid anxiety and low appetite. **SSRIs** are appropriate for comorbid anxiety disorders, especially in the fear-of-consequences presentation with emetophobia or other phobias. **D-cycloserine** is an experimental augmentation of exposure therapy with limited evidence.

<image>A three-column comparison of the three ARFID presentations. Column 1: Lack of Interest/Low Appetite (icon of empty plate, characteristics: disinterest in food, poor hunger cues, easily satiated, failure to thrive). Column 2: Sensory Sensitivity (icon of child rejecting food, characteristics: limited food repertoire, texture/color/smell aversion, gagging response, overlap with ASD). Column 3: Fear of Aversive Consequences (icon of frightened child, characteristics: fear of choking/vomiting, often precipitated by traumatic eating event, progressive restriction, anxiety-driven). Show the common outcome: nutritional deficiency, weight loss, psychosocial impairment. Note that presentations can overlap.</image>

<image>A diagnostic flowchart distinguishing ARFID from anorexia nervosa and normative picky eating. Start with "Child with restricted eating." Branch 1: Is there fear of weight gain or body image disturbance? If yes: consider AN. If no: Is there significant nutritional deficiency, weight loss, or psychosocial impairment? If yes: ARFID. If no: normative picky eating (age-appropriate, no functional impairment). Include key differentiating features at each branch point.</image>

<image>A food exposure hierarchy for a child with sensory-based ARFID. Show a stepwise progression: Step 1 (tolerate food on the table), Step 2 (touch food with hands), Step 3 (bring food to lips), Step 4 (lick or taste food), Step 5 (place small amount in mouth), Step 6 (chew and swallow). Show this for a novel food item. Include a SUDS (anxiety) thermometer alongside showing decreasing anxiety with repeated exposure. Note the use of positive reinforcement at each step.</image>

## Clinical Pearls

ARFID is not picky eating — it causes clinically significant nutritional, medical, or psychosocial consequences. The absence of body image concerns is the key feature distinguishing ARFID from anorexia nervosa, and clinicians should always assess for weight and shape concerns. Identifying the predominant ARFID presentation (low appetite, sensory, or fear) is essential because it directly guides the treatment approach. Children with ASD are at very high risk for ARFID due to sensory processing differences and rigidity, and screening is warranted. A detailed feeding history from birth is essential because many ARFID patients have had feeding difficulties since infancy. Cyproheptadine is commonly used off-label for appetite stimulation in young children with ARFID but has limited evidence. Nutritional supplementation, whether oral or enteral, may be necessary to maintain nutrition while behavioral interventions are being implemented. The fear-of-consequences presentation responds well to exposure-based therapy, similar to the treatment approach for specific phobias. ARFID can develop into AN if body image concerns emerge, and clinicians should monitor for this transition, especially in adolescents.

## References
- Thomas, J.J. & Eddy, K.T. (2019). *Cognitive-Behavioral Therapy for Avoidant/Restrictive Food Intake Disorder: Children, Adolescents, and Adults*. Cambridge University Press.
- Fisher, M.M. et al. (2014). Characteristics of avoidant/restrictive food intake disorder in children and adolescents: a "new disorder" in DSM-5. *Journal of Adolescent Health*, 55(1), 49-52.
- Norris, M.L. et al. (2016). Exploring avoidant/restrictive food intake disorder in eating disordered patients. *International Journal of Eating Disorders*, 47(5), 495-499.
- Zucker, N.L. et al. (2015). ARFID: the intersection of food-related behavior and eating disorders. *Current Psychiatry Reports*, 17(4), 19.
- Sharp, W.G. et al. (2016). Feeding problems and nutrient intake in children with ASD. *Journal of Autism and Developmental Disorders*, 43(9), 2159-2173.
- Bryant-Waugh, R. (2019). ARFID in children and adolescents. *Child and Adolescent Psychiatric Clinics*, 28(4), 581-592.