Atypical Anorexia Nervosa: Signs, Medical Risks, and Treatment
Author: Angela Bogdanova · Published: October 10, 2026 · Editorial Policy
Research cluster: Eating Disorders & Disordered Eating · Written by Artificial Sapiens
Atypical anorexia nervosa (AAN) is a serious restrictive eating disorder in which a person experiences the defining psychological and behavioral features of anorexia nervosa and substantial weight loss, but their weight remains within or above the range generally classified as significantly low. Someone can appear physically well, receive compliments for weight loss, or be told their weight is acceptable while living with severe food restriction, intense fear of weight gain, debilitating preoccupation with eating and body shape, and potentially dangerous malnutrition.
The word atypical describes a diagnostic classification, not the intensity of the illness. In the DSM-5-TR framework, atypical anorexia nervosa is an example of Other Specified Feeding or Eating Disorder (OSFED). The absence of a low-weight criterion does not exclude cardiovascular instability, electrolyte disturbances, endocrine effects, psychological impairment, or the need for specialist and sometimes hospital-based treatment. Society for Adolescent Health and Medicine guidance explicitly recognizes that complications of atypical and typical anorexia can be comparably serious.
This guide explains the clinical definition, warning signs, medical risks across body sizes, diagnostic assessment, treatment options for adolescents and adults, and the practical meaning of recovery. It is educational information; an individual diagnosis and level-of-care decision require a qualified clinical assessment.
What Is Atypical Anorexia Nervosa?
Atypical anorexia nervosa is diagnosed when all criteria for anorexia nervosa are met except that, despite significant weight loss, the person's weight is within or above the normal range according to the diagnostic description. In anorexia nervosa, the diagnostic features include restrictive energy intake producing significantly low body weight, an intense fear of gaining weight or persistent behavior that interferes with weight gain, and a disturbance in the experience of weight or shape, an undue influence of weight or shape on self-evaluation, or persistent failure to recognize the seriousness of low weight. Atypical anorexia captures a similar restrictive, fear-driven clinical presentation where the low-weight element is absent.
Importantly, significant weight loss is a clinical judgment made in context. It is not defined by one universal percentage that a reader can calculate to self-diagnose. Clinicians examine growth history in younger people, previous weight trajectory, the amount and speed of change, medical functioning, and the broader eating-disorder presentation. A person may also be medically compromised through inadequate nutrition during periods when recorded weight has changed little.
The category OSFED has diagnostic status in DSM-5-TR; atypical anorexia is a named example within that category rather than a separately numbered DSM diagnosis. The same broad condition can be discussed differently in other classification and coding systems, including ICD-11. Diagnostic labels guide communication and care, while the person's actual risks and needs determine the treatment plan. A 2024 scoping review by Beard and Waller emphasizes unresolved questions around case definition and treatment research.
Atypical Anorexia Versus Anorexia Nervosa
The central distinction in DSM terminology concerns whether weight is considered significantly low, not whether fear of weight gain, restriction, physical injury, or psychological distress is present. Both presentations can involve rigid dietary rules, extreme difficulty eating adequately, body-image disturbance, compulsive exercise, food-related anxiety, social withdrawal, and pronounced impairment. Both call for careful medical and psychiatric assessment.
The boundary is clinically imperfect. People differ in their natural body size and growth trajectory, and clinicians vary in defining the degree of weight loss that qualifies as significant. A 2024 review of OSFED diagnostic criteria describes inconsistencies in how atypical anorexia has been operationalized. Treatment eligibility and urgency should therefore follow symptoms, nutritional status, medical findings, and functional impairment instead of a rigid assumption about the label.
A systematic review and meta-analysis by Johnson-Munguia and colleagues compared atypical anorexia with anorexia nervosa across 20 studies. Most measures of clinical impairment and eating-disorder psychopathology did not show clear differences, while some measures of weight and shape concerns were higher in the atypical group. Differences vary by outcome and sample. The review challenges the idea that an OSFED diagnosis indicates a milder form of illness.
Signs and Symptoms of Atypical Anorexia Nervosa
Behavioral and eating-pattern changes
Common clinical warning patterns include progressively restricting the amount or variety of food; skipping meals or inventing rules about when eating is permissible; becoming distressed when routine meals change; avoiding shared meals, restaurants, or events involving food; frequently checking food information; and maintaining rigid rituals around eating. Some people describe a strong need to compensate for eating through movement or other behaviors. Restrictions may be concealed, socially rewarded, or framed as wellness and discipline.
These behaviors become especially concerning when they produce persistent fear, inflexibility, guilt, secrecy, conflict, nutritional inadequacy, or impaired daily life. One diet choice or a temporary change in appetite is not equivalent to a psychiatric disorder. Clinicians assess the duration, function, severity, physical consequences, and cognitive experiences surrounding the behavior.
Emotional and cognitive signs
A person may experience an intense fear of weight gain, relentless self-criticism about shape or weight, intrusive food-related thoughts, perfectionism, all-or-nothing rules, a need for control, anxiety around eating enough, or a distorted appraisal of bodily change. Identity and self-worth may increasingly depend on following eating rules or changing appearance. Depression, irritability, isolation, and concentration difficulties may accompany restriction and can also be affected by undernutrition.
Visible confidence or a seemingly positive attitude toward exercise does not establish safety. In adolescents, new rigidity, withdrawal, mood changes, interrupted growth, or loss of previously comfortable food routines may be early clues. In adults, declining work performance, reduced social participation, reproductive changes, and physical exhaustion can be equally informative.
Physical warning signs
Possible manifestations include dizziness, fainting or near-fainting, persistent cold intolerance, fatigue, weakness, constipation, abdominal discomfort, sleep disruption, changes in menstrual functioning where applicable, reduced libido, hair or skin changes, slowed growth or delayed puberty, recurrent injuries, and reduced exercise tolerance. A slow pulse, low blood pressure, low body temperature, and abnormal laboratory results may emerge even when a person's current body size does not appear low.
These symptoms have many possible medical causes, and some people with dangerous restriction report very few symptoms. A normal-looking appearance, a single normal blood test, or a single normal pulse reading cannot establish the absence of risk. NICE guideline NG69 recommends evaluating restrictive behavior, rapid weight change, physical signs, endocrine symptoms, psychiatric comorbidity, and the need for urgent care rather than relying on BMI alone.
Why Medical Risks Can Be Severe at Any Body Size
Undernutrition reflects the relationship between what the body requires and what it receives over time. Body weight is only one observation in that process. After prolonged restriction or substantial weight loss, cardiovascular, metabolic, hormonal, and neurological systems can be affected regardless of where current BMI falls on a population chart. Historical weight trajectory, rate of change, nutrition, purging behaviors, hydration, illness, medications, and age all matter.
A 2023 systematic review and meta-analysis of adolescents with typical and atypical anorexia found medically unstable patients who were not underweight and identified weight loss as important to evaluating risk. It assessed outcomes such as low heart rate, low blood pressure, low temperature, and low phosphate. Findings across included studies were heterogeneous, and associations with admission weight differed by outcome. The clinical lesson is to evaluate the full picture, not replace one weight threshold with another.
A 2019 Pediatrics study by Garber and colleagues of hospitalized adolescents and young adults found that faster weight loss was associated with lower heart rate independently of admission weight, while aspects of weight-loss history were associated with lower phosphorus. Because the sample involved hospitalized patients, those numerical associations should not be generalized as an individual risk calculator for everyone with restrictive eating.
Heart and circulation
Restrictive eating can be associated with bradycardia (a slow heart rate), low blood pressure, dizziness upon standing, fainting, reduced circulation, and changes in cardiac electrical activity. Abnormalities in electrolytes, dehydration, medication effects, and purging can further increase arrhythmia risk. Clinicians may assess lying and standing vital signs and obtain an electrocardiogram (ECG), particularly when restriction, rapid weight loss, purging, weakness, or abnormal pulse is present. APA's 2023 practice guideline recommends ECG assessment in restrictive eating disorders.
Electrolytes, hydration, and metabolism
Inadequate intake, vomiting, misuse of laxatives or diuretics, and other behaviors may disturb potassium, sodium, chloride, magnesium, and phosphate balance. Abnormalities can affect muscles, cognition, circulation, and the heart. Blood glucose disturbances and dehydration may also become medically important. Normal laboratory findings on one occasion do not mean that ongoing restriction is safe; risk changes as behavior and nutritional intake change.
Hormones, bones, and development
Energy deficiency can disrupt reproductive hormones, puberty, growth, and bone health. Irregular or absent menstrual periods may occur in some patients, but they are not required for the diagnosis, and people who do not menstruate can still experience endocrine and skeletal consequences. In children and adolescents, clinicians review growth charts and developmental milestones. Bone problems and nutritional deficiencies merit individualized evaluation when restriction has been prolonged.
The clinical risks of nutritional rehabilitation
Restoring adequate nutrition is a central component of treatment. In substantially malnourished patients, the period of nutritional rehabilitation may require monitoring for electrolyte shifts and refeeding syndrome. The appropriate care setting, monitoring frequency, and nutritional plan depend on clinical severity. Refeeding treatment is medically supervised where risk is significant; patients and families should not have to improvise their own protocols. SAHM and NICE outline specialist medical monitoring and stabilization principles.
When Atypical Anorexia Requires Urgent Medical Attention
Seek emergency medical evaluation for fainting or repeated near-fainting, chest pain, palpitations with weakness or collapse, difficulty breathing, confusion, seizures, severe dehydration, inability to maintain necessary fluid intake, or other signs of acute physical deterioration. Suicidal thoughts with immediate danger also require urgent emergency help. People with significant recent restriction, rapid deterioration, or possible electrolyte disturbance should receive prompt professional assessment even if none of these dramatic symptoms is present.
Hospitalization may be indicated for dangerous vital signs, severe electrolyte or glucose abnormalities, cardiac concerns, acute food refusal, medical instability, or safety needs that cannot be managed in outpatient care. Neither a particular BMI nor a general impression that the person looks healthy determines admission. NICE guidance explicitly advises against using an absolute weight or BMI threshold to decide inpatient or day-patient treatment.
How Is Atypical Anorexia Diagnosed?
Diagnosis is a comprehensive clinical process. An appropriately trained clinician assesses the person's current and historical eating behaviors; fear of weight gain or persistent weight-gain-avoidant behavior; weight and shape concerns; recent and long-term changes in weight or growth; the impact on functioning; and physical findings. The diagnostic interview also examines the person's own explanation of food choices, experiences of distress, and the context in which restriction developed.
In children and adolescents, longitudinal growth curves are particularly important because changes in growth velocity can be clinically significant even when a single weight appears unremarkable. Evaluation commonly includes medical history, medication use, activity, developmental stage, mental health, family context, physical examination, vital signs, and targeted laboratory tests. An ECG may be warranted. Clinicians assess medical causes of symptoms alongside psychiatric explanations. The AAP clinical report on identifying and managing eating disorders in youth and APA practice guideline support integrated medical and psychiatric evaluation.
Screening instruments can help identify people who need a fuller interview. They do not assign DSM diagnoses, distinguish atypical anorexia reliably from every competing condition, or determine medical stability. Similarly, laboratory tests identify aspects of risk and complications; they do not operate as a stand-alone diagnostic test for atypical anorexia. Clinicians review co-occurring anxiety, depression, obsessive-compulsive symptoms, trauma-related difficulties, substance use, self-harm risk, and other eating-disorder behaviors when relevant.
Differential Diagnosis: Conditions That May Look Similar
Other specified feeding or eating disorder (OSFED)
OSFED is the broader diagnostic category containing the atypical anorexia presentation, along with other specified patterns such as purging disorder and some presentations with subthreshold binge-eating frequency or duration. It is not a severity ranking. The defining feature of atypical anorexia within OSFED is an anorexia-like syndrome despite the absence of significantly low weight, not simply any form of irregular eating.
Avoidant/restrictive food intake disorder (ARFID)
ARFID involves restricted intake or avoidance with consequential nutritional, growth, or psychosocial effects, but is not primarily driven by fear of weight gain or disturbances in body-weight or shape experience. Avoidance can relate to sensory properties of foods, limited interest in eating, or feared consequences such as choking or vomiting. A person presenting with food avoidance needs an assessment of the motivation and meaning of the behavior, alongside nutritional and medical risk.
Bulimia nervosa and binge eating disorder
Bulimia nervosa involves recurrent binge-eating episodes accompanied by inappropriate compensatory behaviors and body-weight or shape concerns. Binge eating disorder features recurrent binge episodes with marked distress and without the regular compensatory behaviors of bulimia. Some people with atypical anorexia may also report bingeing or purging experiences; clinicians examine the full pattern, chronology, frequency, and applicable diagnostic criteria rather than applying multiple labels based on isolated actions.
OCD, health-focused rules, and orthorexia
Obsessive-compulsive disorder can involve intrusive fears and rituals that affect eating, but the specific fears, beliefs, and goals of the behavior differ among individuals. The popular term orthorexia describes problematic fixation on supposedly healthy or pure eating, but it is not a stand-alone DSM-5-TR diagnosis. Clinicians assess whether the full presentation meets criteria for an established eating or other mental disorder and what treatment targets are most relevant.
Medical conditions and other psychiatric presentations
Gastrointestinal illness, swallowing disorders, endocrine conditions, medication effects, food insecurity, depression-related appetite change, and other medical or contextual factors can affect eating and weight. A person may also have more than one condition. An appropriate assessment does not treat weight change, nausea, or food avoidance alone as proof of anorexia. For the differential role of fear of choking, see the Hub's published article on choking phobia and eating avoidance.
What Causes Atypical Anorexia Nervosa?
There is no single established cause. Research on anorexia and related restrictive eating disorders supports a multifactorial account involving biological vulnerability, developmental factors, psychological patterns, experiences of anxiety or perceived control, social pressures, interpersonal circumstances, and environmental reinforcement. These contributors vary among people. Restriction itself can intensify preoccupation with food and reduce flexibility, creating a self-reinforcing clinical process.
Weight-related stigma and praise for weight loss may delay recognition. A person can receive positive feedback for restrictive behaviors even as nutritional and psychiatric health deteriorates. Some report beginning with a medically recommended or socially encouraged attempt to change weight, but this history neither proves the cause nor determines whether an eating disorder is present. Social comparison and appearance-focused environments can contribute to distress for some people; the Hub's social media and body image review addresses that broader construct.
The current evidence base has limitations: many studies recruit adolescents and specialist-treatment samples, diagnostic definitions have varied, and causal pathways cannot be established from cross-sectional associations. The Beard–Waller scoping review describes the need for stronger research on classification, trajectories, and specific treatments.
Who Can Develop Atypical Anorexia?
Atypical anorexia can occur in people of varied genders, racial and ethnic backgrounds, ages, body sizes, and socioeconomic circumstances. Stereotypes that equate eating disorders with visibly underweight young women can obscure symptoms in boys and men, larger-bodied patients, older adults, and people whose presentation does not resemble a familiar media image. This matters clinically because delayed recognition can permit extended restriction and worsening complications.
In youth, growth and puberty are central to assessment. In adults, clinicians consider occupation, family responsibilities, chronic disease, hormonal health, and access to care. Athletes and people in appearance- or weight-sensitive environments may be exposed to additional pressures, but participation in sport or attention to nutrition is not itself diagnostic. Patients deserve assessment based on behavior, distress, nutritional adequacy, and clinical findings.
Evidence-Based Treatment of Atypical Anorexia Nervosa
Treatment addresses medical stability, adequate nutrition, eating-disorder thoughts and behaviors, psychological functioning, and social recovery together. The appropriate intensity ranges from coordinated outpatient care to specialist day programs or inpatient medical stabilization. Treatment decisions depend on current clinical risk, developmental stage, safety, ability to eat adequately, family and social supports, and response to earlier care.
Medical stabilization and nutritional rehabilitation
A clinician monitors physical risks and arranges investigations or hospital care when indicated. An eating-disorder-informed registered dietitian or similarly qualified professional helps establish an adequate, flexible nutrition plan suited to the individual's needs. Nutritional rehabilitation may require changes in weight as well as changes in eating patterns and medical monitoring. Goals are individualized and should be informed by previous growth trajectory, age, physiological recovery, symptoms, and clinical judgment rather than a public BMI formula.
There is an important research debate about how to set weight-related targets in atypical anorexia. The SAHM position paper recommends individualized treatment goal weights based on history and development for adolescents and young adults. A 2023 observational study of family-based treatment in atypical anorexia describes differing recommendations and outcomes in a small clinical cohort; it does not establish that one universal target is appropriate. Treatment avoids both automatic dismissal of nutritional restoration needs and one-size-fits-all numerical targets.
Psychological treatment for adults
Clinical guidelines recommend eating-disorder-focused psychotherapy for anorexia nervosa. NICE identifies eating-disorder-focused cognitive behavioral therapy (CBT-ED), the Maudsley Anorexia Nervosa Treatment for Adults (MANTRA), and specialist supportive clinical management (SSCM) as options for adults with anorexia. For OSFED, NICE recommends considering treatment for the disorder the presentation most closely resembles. Applying these approaches to atypical anorexia is a clinically grounded extrapolation, while direct, high-certainty trials specific to atypical anorexia remain limited.
Therapy commonly addresses fear and avoidance around adequate eating, rigid rules, overvaluation of weight or shape, shame, distress tolerance, and the return to valued roles. The person's medical status and nutritional rehabilitation remain part of the clinical plan. A treatment approach that focuses solely on insight or appearance concerns while leaving severe restriction unaddressed is incomplete.
Family-based treatment for adolescents
For adolescents with anorexia nervosa, family-based treatment (FBT) has guideline support, and clinicians may use developmentally appropriate family involvement for atypical anorexia when indicated. FBT helps caregivers support adequate eating and interrupt eating-disorder behaviors without framing the family as the cause of the illness. It requires attention to the adolescent's developmental needs, medical safety, and family context.
Direct evidence in atypical anorexia is smaller and less definitive than the broader adolescent anorexia literature. Published FBT outcome observations and practitioner research point to practical challenges around individualized nutritional and weight goals. These studies are useful for clinical decision-making but cannot be treated as proof of the effectiveness of every possible FBT adaptation.
Medications and co-occurring conditions
There is no medication established as a specific stand-alone treatment for atypical anorexia nervosa. Medicines may be considered for co-occurring conditions or other carefully selected clinical needs, but they do not replace nutritional rehabilitation, medical assessment, or eating-disorder-focused therapy. Medication decisions require a prescriber who understands the risks of malnutrition, electrolyte abnormalities, cardiac effects, and interactions.
When higher levels of care are needed
Outpatient treatment is suitable for many medically stable individuals when the necessary support is available. More intensive services are considered when medical instability, serious nutritional compromise, inability to maintain adequate intake, escalating psychiatric risk, or failure of less intensive treatment makes outpatient care unsafe or ineffective. The NICE guideline emphasizes medical parameters, rate of decline, and whether monitoring can be safely provided rather than a fixed low-weight cutoff.
What Recovery Looks Like
Recovery is a progressive restoration of physical health, nutritional adequacy, flexible and sustainable eating, psychological functioning, and participation in ordinary life. Improvement may include less fear and preoccupation around meals, fewer restrictive or compensatory behaviors, improved concentration and mood, normalization of vital signs or laboratory findings, resumption of healthy developmental processes, and reduced impairment at home, school, work, or in relationships.
A change in appearance or movement on a scale is not a complete measure of recovery. Equally, an apparent return to ordinary weight patterns does not prove that the illness has resolved. Follow-up plans consider relapse signals, emotional triggers, family or social support, continued medical needs, and any co-occurring disorders. The time course differs among individuals, and some people require additional treatment episodes or a change in treatment intensity.
Stigmatizing commentary about bodies or moralizing language about food can undermine a safe therapeutic environment. Families and supporters can help by taking concerns seriously, listening without debating body shape, supporting appointments and meals according to the treatment team's plan, and noticing medical warning signs. They should avoid attempting to diagnose the illness or independently prescribe restoration strategies.
How to Seek Help for Yourself or Someone Else
If substantial restriction, intense weight-related fear, rapid weight change, disrupted functioning, or physical warning signs are present, arrange an assessment with a primary care clinician or eating-disorder specialist as soon as possible. Describe the behaviors and changes in detail rather than relying on how the person looks. For young people, a pediatrician or adolescent-medicine clinician can evaluate growth and medical risk alongside a mental-health referral.
Useful information to bring to an appointment includes when eating patterns changed, symptoms such as dizziness or fainting, changes in energy or daily functioning, concerns about weight or shape, any compensatory behaviors, relevant medications or illnesses, and growth history if available. The clinician can decide what examination, laboratory work, ECG, and referrals are appropriate. If immediate warning signs are present, seek emergency care rather than waiting for an ordinary appointment.
When supporting someone else, speak about specific changes you have observed and their effect on health and daily life. A calm statement such as 'I'm worried about how little you're able to eat and how dizzy you've been; I'd like us to get a medical assessment' is more useful than arguing about whether the person looks underweight. People with atypical anorexia may have been repeatedly reassured or praised because of their appearance, so serious concerns deserve direct recognition.
What the Research Can and Cannot Establish
The evidence that atypical anorexia can cause serious medical and psychological impairment is well supported by clinical cohorts, systematic reviews, and professional guidance. The evidence on the best way to define significant weight loss, predict long-term individual outcomes, select specific treatment variants, and set individualized restoration targets is still developing. The 2024 OSFED meta-analysis and 2024 atypical anorexia scoping review help identify those gaps.
Several sources of uncertainty recur: clinical samples may overrepresent severe cases; younger patients dominate parts of the literature; findings may not generalize to every sex, age group, or cultural context; diagnostic criteria and assessment thresholds vary; and many studies are observational. These limits call for individualized care and clearer research design, not delayed treatment when serious symptoms or medical risk are present.
Frequently Asked Questions
Can you have anorexia without being underweight?
Yes. A person may have the restrictive behaviors, intense fear of weight gain, and body-weight or shape disturbance associated with anorexia nervosa after significant weight loss while remaining within or above the range classified as significantly low. In DSM terminology, that presentation can meet the atypical anorexia nervosa example within OSFED. Diagnosis requires a full clinical evaluation.
Is atypical anorexia less dangerous than anorexia nervosa?
The label does not establish lower risk. Significant malnutrition, cardiovascular instability, psychological impairment, and treatment needs occur in both presentations. A person's actual risk depends on their weight-change history, physical findings, nutritional status, psychiatric safety, and other clinical factors. SAHM guidance explicitly warns that medical and psychological complications may be similarly severe.
Can atypical anorexia cause hospitalization at a normal BMI?
Yes. Hospital care can be required for medical instability or acute psychiatric risk at a body weight that does not fall below a low-weight cutoff. NICE advises clinicians not to use an absolute BMI or weight threshold for admission decisions.
How much weight loss qualifies as atypical anorexia?
DSM-5-TR's description refers to significant weight loss but does not supply one universally applicable percentage for all people. Clinicians evaluate trajectory, growth history, rate of change, and the full diagnostic syndrome. A numeric online checklist cannot establish the diagnosis.
Does atypical anorexia only happen to teenagers?
No. It can affect adolescents and adults, and restrictive eating disorders occur across genders and body sizes. Research is more extensive for adolescents and clinical populations than for some other groups.
Can blood tests be normal despite serious restriction?
Yes. Laboratory values may remain in reference ranges despite clinically important restriction or physiological changes. Medical assessment also considers vital signs, symptoms, history, ECG findings when indicated, and the pattern of nutritional change.
Is atypical anorexia the same as ARFID or orthorexia?
No. ARFID does not center on the weight-gain fears and weight-shape concerns that characterize anorexia-type presentations. Orthorexia is a proposed construct rather than a separate DSM-5-TR diagnosis. Clinicians assess the underlying motives, associated symptoms, and whether diagnostic criteria are met.
What treatment is most effective for atypical anorexia?
A coordinated approach combining medical monitoring, nutritional rehabilitation, and eating-disorder-focused psychological treatment is clinically appropriate. Adolescents may benefit from family-based approaches; adults may receive therapies used for anorexia nervosa. The evidence for specific atypical-anorexia treatment protocols is more limited than the general anorexia treatment literature, so treatment is tailored to medical risk, age, preferences, and response.
Can someone recover without a major change in weight?
Recovery goals are individualized. Physical recovery, adequate nutrition, medical stability, and sustained changes in thinking and behavior all matter. Some individuals require weight restoration; decisions about the amount and trajectory are made by the clinical team using medical and developmental context. Maintaining a particular weight is not by itself evidence of recovery.
Related Articles
Social Media and Body Image: Appearance Comparison, Ideals, and Mental Health — broader research on appearance comparison and body-related distress.
Choking Phobia: Fear of Choking, Eating Avoidance, and Differential Diagnosis — understanding a different pathway to food avoidance.
References
American Academy of Pediatrics. (2021). Identification and management of eating disorders in children and adolescents. Pediatrics. https://doi.org/10.1542/peds.2020-040279
American Psychiatric Association. (2023). Practice guideline for the treatment of patients with eating disorders. American Journal of Psychiatry. https://doi.org/10.1176/appi.ajp.23180001
Beard, J., & Waller, G. (2024). Atypical anorexia nervosa: A scoping review to determine priorities in research and clinical practice. European Eating Disorders Review, 32(5), 841–854. https://doi.org/10.1002/erv.3092
Brennan, C., Illingworth, S., Cini, E., et al. (2023). Medical instability in typical and atypical adolescent anorexia nervosa: A systematic review and meta-analysis. Journal of Eating Disorders, 11, 58. https://doi.org/10.1186/s40337-023-00779-y
Dang, A. B., et al. (2024). Taking a deeper dive into OSFED subtypes: A meta-analysis and systematic review. International Journal of Eating Disorders. https://doi.org/10.1002/eat.24280
Dimitropoulos, G., Kimber, M., Singh, M., et al. (2019). Stay the course: Practitioner reflections on implementing family-based treatment with adolescents with atypical anorexia. Journal of Eating Disorders, 7, 10. https://doi.org/10.1186/s40337-019-0240-8
Garber, A. K., Cheng, J., Accurso, E. C., et al. (2019). Weight loss and illness severity in adolescents with atypical anorexia nervosa. Pediatrics, 144(6), e20192339. https://doi.org/10.1542/peds.2019-2339
Johnson-Munguia, S., Negi, S., Chen, Y., Thomeczek, M. L., & Forbush, K. T. (2024). Eating disorder psychopathology, psychiatric impairment, and symptom frequency of atypical anorexia nervosa versus anorexia nervosa: A systematic review and meta-analysis. International Journal of Eating Disorders, 57(4), 761–779. https://doi.org/10.1002/eat.23989
National Institute for Health and Care Excellence. (2017, updated). Eating disorders: Recognition and treatment (NG69). https://www.nice.org.uk/guidance/ng69/chapter/recommendations
Quon, E. C., & Kelly, B. M. (2023). Weight outcomes for adolescents with atypical anorexia nervosa in family-based treatment. Journal of the Canadian Academy of Child and Adolescent Psychiatry, 32(3), 161–171. https://pubmed.ncbi.nlm.nih.gov/37534121/
Society for Adolescent Health and Medicine. (2022). Medical management of restrictive eating disorders in adolescents and young adults. Journal of Adolescent Health, 71(5), 648–654. https://doi.org/10.1016/j.jadohealth.2022.08.006