Pica Eating Disorder

Pica eating disorder; a feeding disorder characterized by the persistent and regular consumption, over a specified period, of non-nutritive substances that are not considered food and that require clinical intervention. The name of the disorder is derived from the magpie bird, known in Latin for consuming a wide variety of non-food items, and was first described in medical literature by Hippocrates in 400 BCE. ^【1】In previous editions of the Diagnostic and Statistical Manual of Mental Disorders published by the American Psychiatric Association, pica was classified only among disorders of infancy and childhood. With the current edition, DSM-5, it is now categorized under Feeding and Eating Disorders, allowing diagnosis across all age groups.

Clinical Features and Common Types

The substances consumed by individuals with pica syndrome vary widely. The most frequently reported forms in medical literature include geophagia, amylophagia, and pagophagia. In addition, cases of xylophagia, trichophagia, hyalophagia, coprophagia, and ingestion of substances such as chalk, paint, soap, ash, erasers, and fabric have also been documented. Pagophagia is particularly prominent in individuals with iron deficiency, where the craving for solid ice is a dominant feature.

An image representing pica eating disorder. (Generated by artificial intelligence.)

Epidemiology and Demographic Distribution

Pica can occur at any age, gender, or sociocultural group, but it is significantly more prevalent among children aged 1 to 6 years, pregnant women, and individuals with intellectual or developmental disabilities. Epidemiological studies indicate that the prevalence of pica in children varies regionally between 3.8% and 14%. A global meta-analysis focusing on pregnant women reported a prevalence rate of 27.8%, with some countries in Africa reporting rates as high as 100%. In individuals with intellectual disabilities, pica is considered one of the most dangerous self-injurious behaviors, with prevalence rates rising up to 33% in parallel with decreased cognitive function. ^【2】In Türkiye, geophagia in particular has been identified as a long-standing issue in rural and socioeconomically disadvantaged regions of Central Anatolia.

Etiology and Pathophysiology

The exact cause of pica has not been fully elucidated and is generally accepted to be multifactorial. The mechanisms contributing to its development are examined under the following categories:

• Biochemical and Physiological Factors: A strong causal link exists between pica behavior and micronutrient deficiencies, particularly iron and zinc. In pregnant women, low hemoglobin levels and depleted iron stores are among the primary organic factors that trigger pica syndrome.
• Psychosocial and Psychiatric Factors: Parental neglect, childhood abuse, inadequate mother-child interaction, and lack of environmental stimulation can create conditions conducive to the development of pica as a learned behavior. It is believed that individuals neglected emotionally and physically during infancy attempt to fill psychological voids by consuming non-nutritive substances. Psychiatric conditions such as autism spectrum disorder, schizophrenia, early-onset Alzheimer's disease, obsessive-compulsive disorder, post-traumatic stress disorder, depression, and anxiety may also contribute to the development of pica.
• Cultural Factors: In some cultures, pica is supported by cultural and religious rituals as a means of purification, healing, or as part of the pregnancy process, and is not perceived as pathological.

An image representing pica eating disorder. (Generated by artificial intelligence.)

Medical Complications

Pica syndrome can lead to life-threatening complications depending on the physiological properties of the ingested substances. Obstructions and intestinal perforations due to accumulation of foreign bodies in the digestive tract are among the most serious emergencies. Additionally, heavy metal poisoning from ingestion of lead-containing paints, parasitic infections from soil consumption, anemia due to malnutrition, and growth retardation frequently accompany the clinical picture. Dental enamel erosion, broken teeth, gastritis, and colonic dilation are also common physical complications. The disorder also impairs psychosocial functioning by causing social stigma and isolation.

Diagnosis and Differential Diagnosis

According to DSM-5 criteria, a diagnosis of pica requires that the eating behavior persist for at least one month and be developmentally inappropriate. Since the tendency of children under two years of age to explore the world orally is considered normal, the individual must be at least two years old for a diagnosis to be made. The diagnostic process includes a detailed clinical history, complete blood count, iron and ferritin tests, electrolyte panels, and fecal analysis for parasitic screening. Pica is assessed and its severity measured using semi-structured clinical interview tools such as ARFID and Rumination Disorder Interview. ^【3】In differential diagnosis, exclusion of other disorders such as anorexia nervosa is critical. Consumption of non-food substances to suppress appetite or prevent weight gain is not classified as pica but rather as part of anorexia nervosa.

Treatment and Management Approaches

Currently, there is no specific pharmacological agent or universal evidence-based protocol for treating pica. Therefore, treatment strategies require a multidisciplinary approach focused on the underlying cause:

• Medical and Nutritional Interventions: Correction of identified micronutrient deficiencies, particularly zinc and iron, is a fundamental step. It has been observed that eating behaviors often diminish significantly once nutritional deficiencies are addressed. In cases of life-threatening gastrointestinal obstructions, emergency surgical intervention is required.
• Psychotherapy and Behavioral Interventions: Cognitive behavioral therapy, systematic desensitization, and behavioral techniques involving positive and negative reinforcement, as well as physical restriction of access to hazardous substances, have been shown to reduce pica behaviors.
• Psychopharmacotherapy: In cases where pica co-occurs with other psychiatric conditions such as obsessive-compulsive disorder or schizophrenia, selective serotonin reuptake inhibitors and atypical antipsychotics may be incorporated into the treatment plan to control symptoms.
• Preventive Family Counseling: In pediatric cases, educating the family, enhancing social support systems for parents, addressing environmental stimulation deficits, and modifying environmental factors play a major role in preventing relapse.

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