Exploring anorexia nervosa. Understanding its causes, symptoms, and treatment options

Nº de DOI: 10.34896/RSI.2025.89.45.001

AUTHORS

1. Alvaro Antonio Mendoza Vera. General Practitioner. Attached to the Babahoyo IESS General Hospital. Independent Researcher of the Department of Research and Teaching Matilde Hidalgo of Procel. Graduate of the University of Guayaquil. (Daule-Ecuador). https://orcid.org/0009-0006-5905-4208
2. Cristian Santiago Mencías Ríos. General Practitioner. Attached to the Punin Type A Health Centre. Graduate of the Higher Polytechnic School of Chimborazo. (Riobamba-Ecuador). https://orcid.org/0009-0001-5222-1687
3. Yuliana Lisbeth Merino Jimenez. General Practitioner. Attached to the Colaisaca Health Centre. Graduate of the National University of Loja. (Loja-Ecuador). https://orcid.org/0009-0004-2180-9607
4. Marlyn Milena Ortega Lopez. General Practitioner. Attached to the EPS Mallamas. Graduate of the San Martin University Foundation. (Ipiales-Colombia). https://orcid.org/0009-0000-4235-0824
5. Lisette Carolina Peñafiel Bernal. General Practitioner. Attached to the Sacred Heart Institute. Graduate of the Eloy Alfaro Laica University of Manabí. (Quito-Ecuador). https://orcid.org/0009-0000-5319-9373

ABSTRACT

This paper aims to delve deeper into the multifaceted nature of Anorexia Nervosa by exploring its underlying causes, varied symptoms, and the diverse treatment options available, ultimately striving to enhance understanding and inform future research and clinical practices in this critical area of mental health.

KEY WORDS

Anorexia nervosa etiology, psychological and biological factors in anorexia, clinical manifestations of anorexia nervosa and treatment strategies for anorexia nervosa.

RESUMEN

Este artículo pretende profundizar en la naturaleza multifacética de la anorexia nerviosa mediante la exploración de sus causas subyacentes, sus diversos síntomas y las diversas opciones de tratamiento disponibles, con el objetivo de mejorar la comprensión e informar sobre futuras investigaciones y prácticas clínicas en esta área crucial de la salud mental.

PALABRAS CLAVE

Etiología de la anorexia nerviosa, factores psicológicos y biológicos en la anorexia, manifestaciones clínicas de la anorexia nerviosa y estrategias de tratamiento para la anorexia nerviosa.

INTRODUCTION

Anorexia Nervosa, a complex and multifaceted eating disorder, has garnered significant attention in both clinical and academic spheres due to its rising prevalence and profound impact on individuals’ physical and psychological health. Characterized by an intense fear of weight gain and a distorted body image, this disorder often leads to severe malnutrition and a range of debilitating physical and mental health consequences. Understanding the etiology of Anorexia Nervosa is crucial; it is evident that a confluence of genetic, environmental, and psychological factors contributes to its onset. Genetic predispositions, such as variations in genes related to appetite regulation and mood disorders, intertwine with environmental influences, including family dynamics and societal pressures that glorify thinness, creating a fertile ground for the disorder’s development. Additionally, psychological aspects, such as perfectionism and low self-esteem, further exacerbate the risk of Anorexia Nervosa. The symptoms of this disorder are equally complex, encompassing a spectrum of physical manifestations like significant weight loss and amenorrhea, as well as behavioral symptoms such as food avoidance and ritualistic eating patterns, alongside profound psychological symptoms like anxiety and depression. The treatment landscape for Anorexia Nervosa is equally intricate, involving a combination of medical interventions, psychological therapies—including Cognitive Behavioral Therapy, which has shown efficacy in addressing the cognitive distortions associated with the disorder—and nutritional rehabilitation aimed at restoring healthy eating patterns and promoting weight gain.

OBJECTIVE

To delve into the multifaceted nature of anorexia nervosa by exploring its underlying causes, its various symptoms and the different treatment options available.

METHODOLOGY

This scientific review aims to provide a comprehensive analysis of anorexia nervosa by examining its causes, symptoms, and treatment options. A systematic search is conducted using electronic databases such as PubMed, Scopus, and Web of Science to identify relevant peer-reviewed articles, clinical studies, systematic reviews, and meta-analyses published within the last two decades. The search strategy includes keywords such as “anorexia nervosa etiology”, “psychological and biological factors in anorexia”, “clinical manifestations of anorexia nervosa” and “treatment strategies for anorexia nervosa” to ensure a focused and thorough selection of literature.

The review is structured into three main sections: causes, symptoms, and treatment options. The first section explores the multifactorial nature of anorexia nervosa, considering genetic predisposition, neurobiological factors, psychological influences, and sociocultural pressures. Research on neurotransmitter imbalances, altered brain structures, and hormonal dysregulation is analyzed to understand the biological underpinnings of the disorder. Psychological aspects, including perfectionism, anxiety, and trauma, are also reviewed to assess their role in the development and perpetuation of anorexic behaviors.

The second section examines the clinical manifestations of anorexia nervosa, focusing on both physical and psychological symptoms. Studies describing weight loss patterns, metabolic disturbances, cardiovascular complications, and gastrointestinal dysfunction are included to highlight the severe physiological impact of the disorder. Additionally, behavioral and cognitive symptoms, such as intense fear of weight gain, body dysmorphia, and restrictive eating behaviors, are explored using diagnostic criteria from the DSM-5. The impact of anorexia on quality of life, daily functioning, and mental health comorbidities, such as depression and obsessive-compulsive disorder, is also considered.

The third section evaluates treatment strategies, including psychological, pharmacological, and nutritional interventions. Cognitive-behavioral therapy (CBT), family-based therapy (FBT), and emerging psychotherapeutic approaches are assessed for their effectiveness in modifying disordered eating behaviors and improving long-term recovery rates. Pharmacological treatments, including antidepressants and atypical antipsychotics, are reviewed to determine their role in symptom management. Additionally, the importance of multidisciplinary care, including nutritional rehabilitation, medical monitoring, and supportive therapies, is emphasized to address both the physical and psychological aspects of the disorder.

This methodology ensures a structured and evidence-based review of anorexia nervosa, offering valuable insights for healthcare professionals, researchers, and policymakers. The findings aim to enhance understanding of the disorder’s underlying mechanisms, improve early detection and diagnosis, and optimize treatment approaches to improve patient outcomes and long-term recovery.

RESULTS

Causes of Anorexia Nervosa

What genetic factors contribute to the development of Anorexia Nervosa?

The genetic underpinnings of anorexia nervosa are multifaceted, involving various hereditary components and genetic variations that contribute to the disorder’s development. Research has demonstrated that anorexia nervosa has a strong heritability factor, indicating that the genes inherited from one’s parents play a crucial role in its onset^1,2. Genome-wide association studies (GWAS) have been instrumental in identifying specific genetic loci associated with anorexia, helping to elucidate the molecular pathways that might lead to the disorder². Furthermore, individuals with a family history of anorexia are significantly more likely to develop the disorder themselves, reinforcing the importance of genetic predispositions^2,3. These genetic influences do not act in isolation but rather interact with environmental factors to increase susceptibility to anorexia^3,4. Thus, understanding the genetic landscape of anorexia nervosa is essential for developing targeted interventions and improving diagnostic precision.

How do environmental factors, such as family dynamics and cultural influences, play a role in Anorexia Nervosa?

Environmental factors, particularly family dynamics, play a crucial role in the development of anorexia nervosa. Dysfunctional family interactions, such as low familial involvement and negative affectivity, have been identified as significant risk factors for this disorder⁵. Moreover, family discord and dependence further exacerbate the vulnerability to anorexia, creating a milieu in which the disorder can thrive⁵. In addition to these intra-family dynamics, cultural and societal norms exert pressure on individuals, often promoting unrealistic body images that contribute to the onset of anorexia⁶. The pervasive idealization of thinness in popular culture underscores the influence of sociocultural factors, which intertwine with familial contributions to form a complex web of environmental risks⁶. Therefore, interventions aimed at mitigating anorexia should not only address individual psychological factors but also consider the broader context of family dynamics and cultural pressures. By fostering healthier family environments and challenging detrimental societal norms, it is possible to reduce the incidence and severity of anorexia nervosa.

What psychological factors are associated with the onset of Anorexia Nervosa?

In addition to family dynamics and sociocultural factors, psychological factors play a crucial role in the onset of anorexia nervosa. Anxiety is consistently identified as a significant psychological factor contributing to the development of this disorder, with heightened levels of anxiety often preceding the onset of anorexia nervosa⁷. This anxiety can be exacerbated by specific emotions such as stress, which is frequently linked to body dissatisfaction and societal expectations around body image⁸. Furthermore, certain personality traits, including perfectionism and low self-esteem, are commonly associated with individuals who develop anorexia. These traits can lead to distorted thinking patterns where individuals impose rigid standards upon themselves, striving for an unrealistic ideal of perfection⁸. The interplay of these psychological factors suggests a complex interconnection where anxiety, personality traits, and emotions collectively contribute to the susceptibility and onset of anorexia nervosa. Consequently, addressing these psychological components through early interventions and mental health support can be crucial in preventing the progression of anorexia nervosa and mitigating its impact on affected individuals.

Symptoms of Anorexia Nervosa:

What are the primary physical symptoms of Anorexia Nervosa?

One of the primary physical symptoms of anorexia nervosa is significant weight loss, which is often a direct result of severe calorie restriction and nutrient deficiency⁹. This considerable weight loss can manifest in individuals of all body types, and it is crucial to recognize that even those who do not appear excessively thin can still be suffering from anorexia nervosa and its severe repercussions⁹. The physical manifestations of this disorder are not limited to weight alone; individuals often engage in various behaviors such as compulsive exercise, laxative use, and purging to maintain their low weight⁹. These actions exacerbate the physical toll on their bodies, leading to further malnutrition and associated health issues¹⁰. Additionally, people with anorexia nervosa frequently struggle with a distorted body image, perceiving themselves as overweight even when they are dangerously underweight^10,11. This misperception drives their intense fear of gaining weight, perpetuating the cycle of restrictive eating and physical decline¹⁰. Consequently, addressing the physical symptoms of anorexia nervosa requires a comprehensive approach that includes nutritional rehabilitation and psychological support to rectify both the physical and cognitive distortions associated with the disorder.

How do behavioral symptoms manifest in individuals with Anorexia Nervosa?

Behavioral symptoms of anorexia nervosa are multifaceted and deeply intertwined with the individual’s distorted self-perception and relentless pursuit of thinness. One of the most prominent behaviors is extreme dieting and restrictive eating patterns, where individuals consume very little food in an effort to lose weight¹². This behavior is often driven by the unhealthy belief that being thin will lead to greater acceptance or happiness, which underscores the psychological component of the disorder¹². Additionally, individuals with anorexia nervosa frequently engage in over-exercising as another means to control their weight, pushing their bodies to harmful extremes to achieve their desired body image¹². These behaviors are often concealed, making it difficult for others to notice the severity of the disorder. People with anorexia may hide their thinness and their eating habits, creating an additional barrier to early detection and intervention¹³. Consequently, those around them may not realize the extent of their condition until it becomes critically severe. Addressing these behavioral symptoms requires a comprehensive approach that includes psychological support to address the underlying beliefs and perceptions, alongside medical and nutritional interventions to restore physical health.

What are the psychological symptoms commonly observed in Anorexia Nervosa patients?

Anorexia nervosa (AN) is marked by a myriad of psychological symptoms that can profoundly impact an individual’s mental health and daily functioning. One of the most commonly observed symptoms in patients with AN is the presence of severe affective disorders, such as major depression and dysthymic disorder, which often exacerbate the overall psychological burden of the condition¹⁴. Additionally, many individuals with AN display symptoms of obsessive-compulsive disorder (OCD), evident through their rigid and ritualistic eating behaviors that serve as coping mechanisms for their intense fear of gaining weight¹⁴. This obsessive behavior not only highlights the complex interplay between eating disorders and anxiety but also underscores the necessity for comprehensive psychological evaluations in these patients. Furthermore, emotional responses such as heightened anxiety and emotional flatness are prevalent, pointing to the intricate emotional challenges that accompany AN^15,16. These emotional disturbances are compounded by a significant prevalence of comorbid psychiatric diagnoses, indicating that AN rarely exists in isolation and often co-occurs with other mental health disorders¹⁴. The recognition of these interconnected psychological symptoms is crucial for developing effective, multidisciplinary treatment approaches tailored to address both the eating disorder and its associated psychiatric conditions.

Treatment Options for Anorexia Nervosa:

What medical interventions are available for treating Anorexia Nervosa?

Treatment for Anorexia Nervosa is multifaceted, often requiring a combination of medical and therapeutic interventions to address the complex nature of the disorder. Food is considered the primary medicine, highlighting the crucial role of nutritional counseling in the treatment process^17,18. Medical care is vital and continuous, as being significantly underweight can interfere with the effectiveness of medicines taken for other conditions^17,18. While no medications have been found to directly treat Anorexia Nervosa, certain antidepressants may be prescribed to manage the anxiety and depression commonly associated with the disorder, although they do not address the core symptoms or the desire to lose weight^17,19. Additionally, behavioral treatments such as cognitive-behavioral therapy, exposure and response prevention, and supportive psychotherapy have been shown to improve symptoms and promote modest weight gain among adults²⁰. Family and group therapies often play a supportive role, fostering a network of care that is essential for the patient’s recovery¹⁹. Despite these available interventions, there remains a pressing need for the development of novel, mechanism-based approaches to more effectively target the core symptoms of Anorexia Nervosa [20].

How can psychological therapies, such as Cognitive Behavioral Therapy, be used to treat Anorexia Nervosa?

Building on the understanding that anorexia nervosa (AN) is influenced by both genetic and environmental factors, psychological therapies, particularly Cognitive Behavioral Therapy (CBT), play a crucial role in its treatment. CBT is recognized as an evidence-based treatment for AN, offering structured and strategic approaches that target the intricate relationship between thoughts, feelings, and behaviors²¹. One of the core aspects of CBT in treating anorexia nervosa is its focus on cognitive restructuring, where individuals are guided to identify and challenge distorted thoughts related to body image, weight, and eating habits²¹. These cognitive strategies are instrumental in aiding the recovery process, allowing patients to replace maladaptive thoughts with healthier, more realistic perspectives²¹. Additionally, behavioral techniques, such as establishing regular eating patterns and gradual exposure to previously avoided foods, further support the normalization of eating behaviors²². Such comprehensive intervention strategies not only help in achieving and maintaining a healthy weight but also in addressing deeper cognitive distortions, ultimately leading to a more sustained recovery²². For effective implementation, CBT is often initiated with biweekly sessions and transitions to weekly sessions once the patient’s weight stabilizes, ensuring consistent support and monitoring²². Emphasizing schema-level changes, CBT also helps patients dissociate their personal identity from the illness, fostering a stronger motivation for change and reducing the risk of relapse²². Thus, through its multifaceted approach, CBT serves as a cornerstone treatment for anorexia nervosa, addressing both the psychological and behavioral dimensions of the disorder.

What role do nutritional rehabilitation and dietary management play in the treatment of Anorexia Nervosa?

Nutritional rehabilitation and dietary management play a pivotal role in treating anorexia nervosa (AN), addressing both the physical and psychological aspects of the disorder. Proper nutritional rehabilitation is essential to prevent severe or fatal medical complications associated with extreme starvation, such as refeeding syndrome, which can lead to permanent disability or death²³. The process involves carefully monitored re-nutrition to mitigate risks like hypermetabolism and diet-induced thermogenesis, which are common during the early phases of treatment²⁴. Inpatients typically require higher caloric intake, ranging from 30-40 kcal/kg/day and potentially up to 70-100 kcal/kg/day, due to the increased energy demands driven by hypermetabolism and physical activity²⁴. For effective treatment, a multidisciplinary approach that includes professionals such as dietitians familiar with the latest research is crucial to developing individualized, science-based nutritional strategies²⁵. This comprehensive approach not only aims at weight restoration but also involves addressing associated disorders like purging or binge eating, thus ensuring a holistic treatment plan²⁶. Therefore, an integration of structured dietary management and nutritional rehabilitation is vital for achieving long-term recovery and preventing relapse in patients with anorexia nervosa^23,26.

DISCUSSION

The exploration of anorexia nervosa through the lens of its genetic, environmental, and psychological dimensions underscores the complexity of this multifaceted disorder and reveals critical implications for both research and clinical practice. The findings highlight a significant heritability factor, suggesting that genetic predispositions play a pivotal role in the disorder’s onset; this aligns with existing literature that emphasizes the importance of genetic contributions to psychiatric conditions. However, the interaction between genetic factors and environmental influences, particularly family dynamics, illustrates that genetic susceptibility does not operate in isolation. This finding calls for a nuanced understanding of how familial relationships can exacerbate or mitigate these risks, suggesting that interventions should prioritize fostering healthier family environments alongside addressing individual psychological factors. Moreover, the prevalence of anxiety and certain personality traits, such as perfectionism and low self-esteem, among individuals with anorexia points to the necessity of incorporating psychological support into treatment plans. The discussion of sociocultural pressures further complicates the narrative, as the idealization of thinness permeates societal norms, reinforcing the need for comprehensive strategies that challenge these damaging ideals while promoting body positivity. Additionally, the identification of distorted body image perceptions as a hallmark of anorexia necessitates a focus on cognitive restructuring in therapeutic settings. A multidisciplinary approach that integrates nutritional rehabilitation and psychological support emerges as essential for effective treatment, particularly when considering the role of food as a fundamental component of recovery. Despite these insights, limitations in current research, such as the need for larger, more diverse samples in genetic studies and an underrepresentation of cultural contexts, warrant further investigation. Future research should aim to elucidate the molecular pathways linked to anorexia nervosa, while also exploring innovative interventions that address the interplay of genetic, environmental, and psychological factors. By broadening the scope of inquiry and refining treatment approaches, we can enhance our understanding of anorexia nervosa and ultimately improve outcomes for those affected by this debilitating disorder.

CONCLUSIONS

Anorexia nervosa is a complex and multifaceted disorder with profound physical, psychological, and social consequences. This review highlights the interplay of genetic, neurobiological, psychological, and environmental factors in the development and persistence of the disorder. While genetic predisposition and neurotransmitter imbalances contribute to susceptibility, psychological factors such as perfectionism, anxiety, and body image distortion play a significant role in reinforcing disordered eating behaviors. Furthermore, sociocultural pressures, particularly the influence of media and societal standards of beauty, exacerbate the risk of developing anorexia nervosa, particularly among adolescents and young adults.

The clinical manifestations of anorexia nervosa extend beyond extreme weight loss, affecting nearly every organ system in the body. Cardiovascular complications, metabolic disturbances, hormonal imbalances, and gastrointestinal dysfunction highlight the severe physiological toll of prolonged food restriction. Additionally, the cognitive and emotional aspects of the disorder, including an intense fear of weight gain, compulsive behaviors, and distorted body image, contribute to its chronic and relapsing nature. These symptoms not only impact an individual’s physical health but also severely affect their quality of life, interpersonal relationships, and overall mental well-being.

Despite advancements in treatment, anorexia nervosa remains a challenging disorder to manage, with high relapse rates and significant mortality risk. Psychotherapeutic interventions such as cognitive-behavioral therapy (CBT) and family-based therapy (FBT) have shown efficacy in modifying maladaptive thought patterns and behaviors, yet long-term recovery remains difficult for many patients. Pharmacological treatments, while useful in addressing comorbid conditions such as depression and anxiety, are not always effective in directly treating anorexic behaviors. Nutritional rehabilitation and medical stabilization are essential components of treatment, but they require careful monitoring to prevent complications such as refeeding syndrome. A multidisciplinary and individualized approach, integrating psychological support, medical care, and social reinforcement, remains crucial for improving patient outcomes.

FUTURE DIRECTIONS

Future research should focus on identifying more effective treatment modalities, particularly those that target the neurobiological mechanisms underlying anorexia nervosa. Additionally, early intervention strategies and preventive measures, including education on healthy body image and eating behaviors, should be prioritized to reduce the incidence and severity of the disorder. Greater awareness and understanding of anorexia nervosa among healthcare providers, families, and society as a whole are essential to improving early diagnosis, access to care, and long-term recovery outcomes.

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