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Am Fam Physician. 2008;77(2):187-195

A more recent article on eating disorders in primary care is available.

Patient information: See related handout on eating disorders, written by the authors of this article.

Author disclosure: Nothing to disclose.

Binge-eating disorder, bulimia nervosa, and anorexia nervosa are potentially life-threatening disorders that involve complex psychosocial issues. A strong therapeutic relationship between the physician and patient is necessary for assessing the psychosocial and medical factors used to determine the appropriate level of care. Most patients can be effectively treated in the outpatient setting by a health care team that includes a physician, a registered dietitian, and a therapist. Psychiatric consultation may be beneficial. Patients may require inpatient care if they are suicidal or have life-threatening medical complications, such as marked bradycardia, hypotension, hypothermia, severe electrolyte disturbances, end-organ compromise, or weight below 85 percent of their healthy body weight. For the treatment of binge-eating disorder and bulimia nervosa, good evidence supports the use of interpersonal and cognitive behavior therapies, as well as antidepressants. Limited evidence supports the use of guided self-help programs as a first step in a stepped-care approach to these disorders. For patients with anorexia nervosa, the effectiveness of behavioral or pharmacologic treatments remains unclear.

Lifetime prevalence estimates for anorexia nervosa, bulimia nervosa, and binge-eating disorder are 0.6, 1.0, and 2.8 percent, respectively, with the risk up to threefold higher in women than men.1 Median age of onset is 18 to 21 years.1 Because most patients do not typically present with the chief complaint of an eating disorder, a physician must be attentive to the possible diagnosis, especially when caring for young women. Screening for eating disorders should be considered in the routine care of at-risk patients.24 Presenting symptoms may include fatigue, dizziness, low energy, amenorrhea, weight loss or gain, constipation, bloating, abdominal discomfort, heartburn, sore throat, palpitations, polyuria, polydipsia, and insomnia. Most patients with eating disorders do not have signs on physical examination. Clinical signs of advanced eating disorders are listed in Table 1.4 The diagnostic criteria for anorexia nervosa, bulimia nervosa, and eating disorder not otherwise specified, which includes binge-eating disorder, are summarized in Tables 2 through 4.5 The comprehensive approach to screening and diagnosing eating disorders in primary care has been well-described.4,6,7

Clinical recommendationEvidence ratingReferences
Interpersonal or cognitive behavior therapy should be offered to patients with bulimia nervosa and binge-eating disorder.A10, 18, 22
A self-help program may be considered as the first step in the treatment of bulimia nervosa and binge-eating disorder.B18, 19, 2123
Most patients with anorexia nervosa should be treated as outpatients in a tertiary care setting by a multidisciplinary team.C2, 3
A trial of an antidepressant may be offered as a primary therapy or in combination with psychotherapy in patients with bulimia nervosa.B8, 22
General appearanceEmaciated, sunken cheeks, sallow skin, flat affect; may be normal weight or overweight
Vital signsBradycardia, hypotension, hypothermia, orthostasis
SkinDry skin, lanugo, dull or brittle hair, nail changes, hypercarotenemic, subconjunctival hemorrhage
HEENTSunken eyes, dry lips, gingivitis, loss of tooth enamel on lingual and occlusal surfaces, dental caries, parotitis
BreastsAtrophy
CardiacMitral valve prolapse, click, or murmur; arrhythmias
AbdomenScaphoid, palpable loops of stool, tender epigastrium
ExtremitiesEdema, calluses on dorsum of hand (Russell's sign), acrocyanosis, Raynaud's phenomenon
NeuromuscularTrousseau's sign,* diminished deep tendon reflexes
The rightsholder did not grant rights to reproduce this item in electronic media. For the missing item, see the original print version of this publication.
The rightsholder did not grant rights to reproduce this item in electronic media. For the missing item, see the original print version of this publication.
The rightsholder did not grant rights to reproduce this item in electronic media. For the missing item, see the original print version of this publication.

Establishing a Care Plan

Once a person is diagnosed with an eating disorder, psychosocial and clinical factors should initially be considered (Table 52 ), followed by periodic reassessments. The role of the physician is to assess medical complications, monitor weight and nutrition status, assist in the management strategies of other team members, and serve as the care coordinator. Dietitians provide information on a healthy diet and meal planning, and may assist the team in identifying appropriate weight goals. Behavioral health care professionals perform cognitive behavior, interpersonal, or family therapy, and may assist with pharmacotherapy.24,8 A stepped-care approach may be applied, in which the initial intervention is determined by the patient's needs and available treatment resources.911

CharacteristicLevel 1: outpatientLevel 2: intensive outpatientLevel 3: full day outpatientLevel 4: residential treatment centerLevel 5: inpatient hospitalization
Medical statusMedically stable to the extent that more extensive monitoring, as defined in Levels 4 and 5, is not requiredMedically stable (not requiring IV fluids, NG tube feedings, or multiple daily laboratory tests)Adults: heart rate < 40 beats per minute; blood pressure < 90/60 mm Hg; glucose < 60 mg/dL (3.33 mmol/L); potassium < 3 mEq/L (3 mmol/L); electrolyte imbalance; temperature < 97.0°F (36.1°C); dehydration; hepatic, renal or cardiovascular organ compromise; poorly controlled diabetes
Children and adolescents: heart rate near 40 beats per minute; orthostatic blood pressure changes; blood pressure < 80/50 mm Hg; hypokalemia, hypophosphatemia, or hypomagnesemia
SuicidalityIf suicidality is present, inpatient monitoring and treatment may be needed depending on the estimated level of riskSpecific plan with lethality or intent; admission may also be indicated after suicide attempt depending on the presence or absence of other factors modulating suicide risk
Weight, as percentage of healthy body weightGenerally > 85%Generally > 80%Generally > 80%Generally < 85%Generally < 85%; acute weight decline with food refusal even if not < 85% of healthy body weight
Motivation to recover (i.e., cooperativeness, insight, ability to control obsessive thoughts)Fair to good motivationFair motivationPartial motivation;cooperative;patient preoccupied with intrusive, repetitive thoughts > 3 hours/dayPoor to fair motivation; patient preoccupied with intrusive, repetitive thoughts 4 to 6 hours/day; patient cooperative with highly structured treatmentVery poor to poor motivation; patient preoccupied with intrusive, repetitive thoughts; patient uncooperative with treatment or cooperative only in a highly structured environment
Comorbid disorders (e.g., substance abuse, depression, anxiety)Presence of comorbid condition may influence choice of level of careAny existing psychiatric disorder that would require hospitalization
Structure needed for eating/gaining weightSelf-sufficientSelf-sufficientNeeds some structure to gain weightNeeds supervision at all meals or will restrict eatingNeeds supervision during and after all meals or nasogastric/special feeding modality
Ability to control compulsive exercisingCan manage compulsive exercising through self-controlSome degree of external structure beyond self-control required to prevent patient from compulsive exercising; rarely a sole indication for increasing the level of care
Purging behavior (e.g., use of laxatives or diuretics)Can greatly reduce incidents of purging in an unstructured setting; no significant medical complications suggesting need for hospitalizationCan ask for and use support from others or use cognitive behavior therapy skills to inhibit purgingNeeds supervision during and after all meals and in bathrooms; unable to control multiple daily episodes of purging that are severe and disabling, despite appropriate trial of outpatient care, even if routine laboratory test results are normal
Environmental stressOthers able to provide adequate emotional and practical support and structureOthers able to provide at least limited support and structureSevere family conflict or problems, or absence of family so unable to receive structured treatment in home, or patient lives alone without adequate support system
Geographic availability of treatment programPatient lives near treatment settingTreatment program is too distant for patient to participate from home

The Patient Interaction

A therapeutic relationship between the physician and patient is central to the treatment of an eating disorder.2,12,13 As a foundation to this relationship, the physician needs to understand how difficult it can be for patients to change eating-related thoughts and behaviors. These behaviors may serve critical functions for them, such as helping to manage their stressors, difficult emotions, and boredom. Eating disorders also reinforce patient beliefs that their lives are structured and self-controlled, that they are safe and special, and that they must be thin to be worthwhile.14,15 A collaborative approach acknowledging the difficulties associated with change and employing curious, nonconfrontational questioning (i.e., Socratic style) may help motivate the patient to engage in treatment.13,15

Medical Assessment and Treatment

A baseline general medical and psychiatric assessment should be performed at the time of diagnosis and periodically thereafter, as clinically indicated. Medical complications to be managed in patients with eating disorders are listed in Table 6.2,4 It is necessary to monitor physiological and psychological signs of decline, such as shifts in weight, blood pressure, pulse, cardiovascular or metabolic status, suicidal ideation or attempts, and other impulsive and compulsive self-harm behaviors.2 Although life-threatening medical complications require inpatient hospitalization, preferably in a specialized unit (Table 52 ), the majority of complications will resolve when healthy eating habits are restored and a normal weight is achieved. Patients with binge-eating disorder may require management of complications associated with being overweight or obese. Even with successful treatment of the eating disorder, osteoporosis may remain as a medical concern, primarily for patients with anorexia. Dental erosions are most often seen in patients with bulimia, but remain a concern for any patient who purges by vomiting.

Complication typeAnorexia nervosaBulimia nervosa
CardiovascularArrhythmias
Bradycardia
Conduction defects (e.g., QTc prolongation)
ECG abnormalities (e.g., low voltage, T-wave inversions, ST-segment depression)
Hypotension
Mitral valve prolapse
Peripheral edema
Sudden death
Arrhythmias
Diet pill toxicity (e.g., palpitations, hypertension)
Emetine cardiomyopathy (ipecac syrup)
Mitral valve prolapse
Peripheral edema
DermatologicCarotenosis
Dry skin, brittle nails
Lanugo
Starvation-associated pruritus
Russell's sign (i.e., calluses on dorsum of hand from purging)
EndocrineAmenorrhea
Hypercholesterolemia
Hypercortisolemia
Hypoglycemia
Impaired temperature regulation
Infertility
Neurogenic diabetes insipidus
Osteopenia/osteoporosis
Thyroid abnormalities
Amenorrhea
Hypoglycemia
Irregular menses
Mineralocorticoid excess
Osteopenia
GastrointestinalAbnormal liver function tests
Acute gastric dilation from refeeding
Bloating/fullness
Constipation
Delayed gastric emptying
Refeeding pancreatitis
Slowed gastrointestinal motility
Acute gastric dilation
Cathartic colon
Constipation from laxative abuse
Dental erosion
Esophageal rupture
Esophagitis
Gastroesophageal reflux
Mallory-Weiss syndrome
Parotid gland swelling
Post-binge pancreatitis
HematologicAnemia (normocytic, normochromic)
Decreased erythrocyte sedimentation rate
Mild leukopenia with relative lymphocytosis
Thrombocytopenia
None commonly associated
MetabolicDehydration
Electrolyte imbalance
Increased serum carotene
Refeeding syndrome
Dehydration
Electrolyte imbalance
NeurologicCognitive impairment
Pseudoatrophy (i.e., enlarged cerebral ventricles and external cerebrospinal fluid spaces)
Seizures
Cognitive impairment
Cortical atrophy, ventricular enlargement
Peripheral neuropathy
Pulmonary/mediastinalDecreased pulmonary capacityAspiration pneumonitis
Pneumomediastinum precipitated by vomiting
Pneumothorax or rib fractures
RenalIncreased blood urea nitrogen concentration
Renal stones
Increased blood urea nitrogen concentration
Renal stones

To evaluate for osteoporosis, dual-energy x-ray absorptiometry is recommended, particularly in patients who have had amenorrhea for longer than six months.2 The primary treatment for eating-disorder–related osteoporosis is weight gain. The effectiveness of calcium and vitamin D supplementation, estrogen therapy, and growth factors (insulin-like growth factor I) has been mixed.16 Bisphosphonates are currently not recommended because of concerns about effectiveness and long-term safety.2

Irreversible dental erosions from recurrent regurgitation of gastric acid may occur in those who purge using self-induced vomiting. In addition to routine dental care, patients should be instructed to use a baking soda mouth rinse and to brush their teeth after vomiting.17 Desensitizing toothpastes and fluoride applications may decrease tooth sensitivity.

Behavioral Interventions

Behavioral interventions for treating eating disorders help patients change their undesirable behaviors (e.g., bingeing, purging, restricting food consumption) and thoughts (e.g., negative body image, negative self-evaluation, perfectionistic thinking). An early step in treatment is to assess a patient's motivation to change. Patients with eating disorders are often ambivalent about changing, but physicians may be able to enhance their motivation.13 Unless there are compelling concerns about the health of an unmotivated patient, physicians should provide feedback about their concerns and offer their assistance if the patient decides to change.

BINGE-EATING DISORDER

Cognitive behavior therapy (CBT) is the behavioral intervention of choice for binge-eating disorder.2,3,10 In a systematic review of randomized controlled trials, patients treated with CBT reported fewer bingeing episodes and improved ratings of restraint, hunger, and disinhibition than waiting-list control patients.18 Limited evidence also demonstrates effectiveness of treatment using pure or guided self-help programs.3,18,19

Guided self-help programs often include the components listed in Table 7.20 The treatment is designed to help patients understand the functions of disordered eating; increase healthy eating habits and decrease unhealthy dieting; identify alternatives to the urge to binge; cope with distress; and establish a relapse-prevention plan. Self-help programs may be used by the patient alone (pure self-help) or with the assistance of a nonspecialized medical therapist (guided self-help), making them well-suited for the primary care setting.21 Because patients meeting the criteria for binge-eating disorder are typically overweight or obese, therapy to reduce binge eating may need to be coupled with strategies to lose weight.

ComponentsPurpose and strategies
Initiate self-monitoring of food consumptionTrack time, location, situation, and content of eating behaviors
Establish environmental, cognitive, and emotional precipitants and responses to bingeing and purging
Increase awareness of eating habits
Educate about relationship between eating and weight, and establish standard eating scheduleInform about healthy weight range and physical consequences of eating-disordered behaviors and ineffectiveness of purging behaviors for weight management
Eat three meals and two to three snacks per day; skipping meals contributes to bingeing and purging
Avoid vomiting after meals
Develop alternatives to bingeing and purgingDo pleasurable activities that help to delay and distract from urge to binge and purge (e.g., walking, e-mailing, telephoning someone, watching television, engaging in a hobby, taking a shower)
Reinforce that the urge to binge and purge will dissipate with time
Develop problem-solving strategiesLearn to identify problems early
Develop strategies for coping with distress (e.g., relaxation techniques)
Reduce strict dietingEncourage balanced healthy eating and avoidance of unhealthy dieting strategies, such as not eating for long periods of time, setting unrealistic calorie goals, and avoiding specific foods or food groups
Develop relapse-prevention strategiesPlan for slips in bingeing and purging behaviors and possible responses (e.g., reinitiating self-monitoring, scheduling appointment with physician)

BULIMIA NERVOSA

CBT and other psychotherapies, particularly interpersonal therapy, are effective in the treatment of patients with bulimia nervosa.2,3,10 A systematic review of randomized controlled trials demonstrated that patients treated with behavioral interventions, particularly CBT, have greater decreases in binge and purge frequency and psychological features of the eating disorder than waiting-list control patients.22 The effectiveness of guided self-help treatments for bulimia nervosa is less clear than it is for binge-eating disorder.2224

Persons with bulimia nervosa often demonstrate unhealthy thinking styles similar to those with anorexia nervosa. There is often a negative self-evaluation based almost exclusively on body image and weight, and a severe drive toward thinness.25 As a result, patients with bulimia nervosa often omit mentioning purging or other compensatory behaviors (e.g., use of laxatives, diuretics, and diet pills; vomiting; excessive exercise) unless they are specifically asked about them. A physician may adapt strategies used in CBT to address these issues. Asking “Socratic style” questions to challenge their thoughts (Table 826 ) may help patients modify their dysfunctional thinking habits, as well as their unhealthy eating and compensatory behaviors.13

GoalQuestions/statements
Start a conversation about eating habitsWould it be okay if we discussed your eating habits?
I'm concerned about your eating. May we discuss how you typically eat?
Assess motivation to change eating habitsOn a scale of 0 to 10, how important is it for you to change your eating? What would make it more important?
On a scale of 0 to 10, how confident are you that you could change the way you eat? What would make you more confident?
What do you like about the way you eat? What do you dislike?
What would be the benefits of changing the way you eat?
What would be the downside of changing the way you eat?
How would your life be different if you didn't need to spend so much time thinking about your eating?
It sounds like your eating habits are really important for helping you get through the day.
Determine the antecedents and consequences of disordered eating patternsDo you ever feel that you lose control over the way you eat? How often does that happen?
When are you most likely to binge?
Sometimes people binge and purge when they are overwhelmed, stressed, sad, or anxious; do any of those situations apply to you?
How do you feel before you binge? After you binge? Before you purge? After you purge? What happens after you purge?
How does eating impact your ability to function during the day? Do you feel tired? Is it difficult to concentrate?
Sometimes people think about how they are eating all day to the point that it is difficult to concentrate on anything else. Does that happen to you?
Develop alternatives to bingeingWhen you feel an urge to binge, what could you do instead of bingeing? Consider activities that you could do in the situations when you are most likely to binge.
Change negative thinkingWho demands that you must be perfect?
Who determines how you think about yourself?
What can you control?

ANOREXIA NERVOSA

Patients with anorexia nervosa typically require specialized, outpatient tertiary care treatment, although hospitalization may be indicated in severe anorexia (Table 52 ). Multiple behavioral interventions (e.g., individual psychotherapy, CBT, family therapy) are commonly used for the treatment of anorexia nervosa. However, the long-term effectiveness of these therapies remains unclear.2,3 A systematic review of 32 randomized controlled trials assessed the overall evidence for treatment effectiveness as weak, with the exception of psychotherapy for adolescents, which was rated moderately strong.27 Self-help strategies are not appropriate for patients with anorexia nervosa.2,3

Because patients with anorexia nervosa rarely self-identify, physicians need to help them recognize their eating problems, increase their motivations for treatment, and assist with care coordination.3 Once this has been accomplished, an early treatment intervention is nutritional rehabilitation, which involves a stepwise and structured reintroduction of meals and snacks, with a short-term goal of 1.1 to 2.2 lb (0.5 to 1 kg) weight gain per week and a long-term goal of an age- and gender-appropriate weight.24 For women with anorexia nervosa, the weight goal is that at which menstruation and ovulation resume. Individual psychotherapy may be ineffective in the starving patient.2 Patients with rapid or severe weight loss (i.e., those who weigh less than 70 percent of their healthy body weight) must be monitored closely for refeeding syndrome during the first two to three weeks of nutritional rehabilitation. Along with weight gain, treatment efforts focus on modifying thoughts and beliefs about food, weight, self-concept, and control, as well as developing relapse-prevention strategies.

Pharmacotherapy

BINGE-EATING DISORDER

Several medications have shown benefit in the short-term treatment of binge-eating disorder.2,28,29 A systematic review of randomized controlled trials studying the use of a variety of selective serotonin reuptake inhibitors (SSRIs; e.g., fluoxetine [Prozac], sertraline [Zoloft], citalopram [Celexa]); tricyclic antidepressants (e.g., imipramine [Tofranil]); antiepileptics (topiramate [Topamax]); and appetite suppressants (sibutramine [Meridia]) demonstrated moderate evidence of the effectiveness of medication. Use of these agents resulted in a significant decrease in binge frequency and illness severity when compared with placebo.18 Other symptoms of binge-eating disorder, such as depressed mood and eating-related obsessions and compulsions, as well as impact on body weight, were variably affected, depending on the agent studied.18 Treatment dosages in most studies using SSRIs were at or near the high end of the recommended dosage range.

The addition of antidepressant medication (e.g., fluoxetine) to CBT does not appear to add to the effectiveness of CBT in reducing binge-eating episodes.29 However, in a randomized controlled trial comparing CBT plus placebo with CBT plus orlistat (Xenical), persons treated with CBT plus orlistat achieved greater remission rates (i.e., zero binges for 28 days) at the end of treatment, as well as greater initial weight loss (−3.5 lb [−1.6 kg] versus −7.7 lb [−3.5 kg]).30

BULIMIA NERVOSA

The effectiveness of antidepressant agents in treating the symptoms of bulimia nervosa has been systematically studied. When compared with placebo, treatment resulted in improved remission rates, but was associated with higher drop-out rates.22 The combination of CBT plus medication has been shown to have added benefit over medication or therapy alone.8,22 Although most patients are first offered a trial of a behavioral therapy, antidepressant medication may be considered as an alternative or additional first step.3 Various classes of antidepressant medications decrease binge eating and vomiting in patients with bulimia nervosa.2,22,29 SSRIs are recommended as first-line agents because of their effectiveness and safety profile.2 Fluoxetine, in a dosage of 60 mg per day, is the only agent approved by the U.S. Food and Drug Administration for the treatment of eating disorders, specifically for bulimia nervosa. As with binge-eating disorder, higher doses of SSRIs may be more effective in treating bulimic symptoms. Despite its proven effectiveness, bupropion (Wellbutrin) is contraindicated because of the association of its use with seizures in patients who purge.2 Additional agents that appear promising include topiramate and ondansetron (Zofran).2,3133

ANOREXIA NERVOSA

Antidepressant medications for the treatment of anorexia nervosa have limited effectiveness and should not be the sole treatment modality.2,3,27 Preliminary studies using the atypical antipsychotic olanzapine (Zyprexa) have demonstrated positive results.3436 Psychotropic medications may be effective as an adjunctive therapy when treating comorbid disorders, such as depression and anxiety.

Patient Education

It is helpful to provide patients and their families with education on the nature, course, and treatment of eating disorders. When treating children and adolescents, caregivers and family members should be included in the treatment process to share information, provide guidance on behavioral management (i.e., meal planning, limit-setting), and facilitate communication.3,4 Family member participation in support groups should also be encouraged.3

Prognosis

Approximately 70 percent of persons with bulimia nervosa and 27 to 50 percent of persons with anorexia nervosa will not show evidence of a clinical eating disorder within 10 years of follow-up after receiving treatment in a tertiary care setting.3739 The remaining persons will not improve, maintain a subclinical eating disorder, or meet criteria for another eating disorder. Standardized mortality ratios (SMRs) are elevated for patients with anorexia nervosa, ranging from 1.36 for females 20 years following treatment to 30.5 for females less than one year following treatment.39 SMRs for patients with bulimia nervosa are not significantly different from the rate expected in the population matched by age and sex.39 The long-term prognosis for binge-eating disorder remains unclear.2,39

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