Feeding and eating disorders represent a critical area of intervention for primary care providers. These conditions have a lifetime prevalence of 2-5% in the global population and result in significant mortality. Notably, anorexia nervosa is considered the most lethal psychiatric condition of all. A common misconception is that patients must appear emaciated to have an eating disorder; however, the majority of individuals with these conditions do not present at a low body weight.
Recognizing the Spectrum of Eating Disorders
Recognizing the diverse presentation of these disorders is the first step in effective management.
- Anorexia Nervosa: Characterized by an intense fear of gaining weight, persistent behaviors that prevent weight gain, and a significantly low body weight.
- Bulimia Nervosa: Involves recurrent binge eating episodes followed by compensatory behaviors—such as fasting, vomiting, or excessive exercise—to prevent weight gain. Bulimia nervosa carries significant mental health risks, with approximately one-quarter to one-third of patients experiencing suicidal ideation.
- Binge Eating Disorder (BED): Also involves eating large quantities of food with a feeling of lost control and ensuing shame, but it differs from bulimia because it lacks compensatory behaviors. Patients with BED may eat rapidly, eat until uncomfortably full, eat alone due to embarrassment, or consume large amounts when not physically hungry. BED also carries significant mental health risks, including suicidal ideation and attempts.
Providers should also be vigilant for other feeding disorders. Avoidant/Restrictive Food Intake Disorder (ARFID) presents as a feeding disturbance based on sensory concerns, negative consequences, or a lack of interest, rather than body image issues. Pica involves consuming non-nutritive substances for over a month, while rumination disorder entails the regurgitation of food that may be re-chewed, re-swallowed, or spit out. It is important to rule out medical causes, such as GERD or pyloric stenosis, when evaluating for rumination disorder.
Medical Evaluation and Complications
When assessing a patient, medical stabilization is the foremost priority. This is necessary to address acute health issues stemming from malnutrition or to safely detox patients from severe laxative, diuretic, or substance abuse. Providers should order appropriate laboratory tests, including a CBC, CMP, TSH, magnesium, phosphorus, calcium, and albumin. It is essential to closely monitor for physical complications related to purging or excessive exercise, such as electrolyte abnormalities, cardiac issues, and postural orthostatic tachycardia syndrome (POTS).
Multidisciplinary Treatment Pathways
Treatment typically requires a multidisciplinary approach encompassing primary care, psychiatry, psychotherapy, nutrition, and sometimes speech therapy. In this field, food is medicine; it is crucial to note that medications are less effective for patients who are nutrient-deficient or significantly underweight.
When indicated, the only FDA-approved medication for bulimia nervosa is fluoxetine, an SSRI which can improve mood and reduce binge-purge cycles. For BED, lisdexamfetamine is the only FDA-approved option. First-line psychotherapy treatments include Cognitive Behavioral Therapy (CBT), family-based treatment (FBT) for adolescents with anorexia nervosa, Dialectical Behavior Therapy (DBT), and mindfulness practices to address distorted thinking and reduce binge episodes.
Depending on the severity, higher levels of care may be necessary. Multiple clinical criteria, including vital signs, laboratory values, psychiatric stability, and body weight, are used to determine the appropriate level of care. Patients at 70% to 84% of their ideal body weight (IBW) often require inpatient or residential programs, while those at 85% to 95% of their IBW may benefit from a partial hospitalization program (PHP).
Leveraging the Collaborative Care Model (CoCM)
Primary care providers can effectively support these patients through the Collaborative Care Model (CoCM). The CoCM ensures a structured, supportive, and multidisciplinary approach to management. It facilitates regular systematic case reviews between the treating clinician and a psychiatric consultant. This integrated care approach enhances communication through shared electronic health records and involves patients directly in their treatment plans to improve adherence.
Furthermore, CoCM relies on regular assessments to track treatment outcomes and patient satisfaction, allowing teams to consistently refine care strategies. When higher levels of intervention are needed, organizations like Concert Health can connect patients to additional resources—such as Equip Health, Center for Discovery, Turning Point of Tampa, and Galen Hope—to bridge the gap and provide comprehensive, ongoing support.