Understanding the 'Chew and Spit' Eating Disorder

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Among the lesser-known and less-studied eating disorder behaviors is known as chewing and spitting. This activity consists of chewing food, usually food that is highly enjoyable and energy-dense, and spitting it out before swallowing. The intent of the behavior is to enjoy food’s taste while preventing the ingestion of calories. Chewing and spitting has some similarities to bingeing in that it involves consuming larger amounts of high-calorie foods than intended, but is also similar to restrictive eating in that the food is not actually ingested.

Chewing and Spitting in the DSM-5

Initially, spitting was thought to be just an alternative to vomiting, so was studied primarily in women with bulimia nervosa. In the prior version of the Diagnostic and Statistical Manual (DSM-IV), chewing and spitting was listed as a potential symptom of eating disorder not otherwise specified (EDNOS), which in the DSM-5 has been replaced with the category of other specified feeding and eating disorder (OSFED).

However, the DSM-5 does not list chewing and spitting under any single disorder because it is now recognized that the behavior can occur across all eating disorder diagnoses.

Chewing and spitting may be exhibited by patients diagnosed with anorexia nervosa, bulimia nervosa, or other specified eating disorder. It has further been noted to occur in elevated rates amongst individuals who have undergone bariatric surgery, a growing population.

Research on Chewing and Spitting

One of the first published case reports (De Zwaan, 1997) of the behavior described a 19-year-old woman with anorexia accompanied by chewing and spitting.

She either spent hours in the bathroom or spit the food into carrier bags, both at home and while walking on the streets. The chewing and spitting out took up to 6 hours every day, preventing her from studying and from social contacts. Her mother insisted on family meals every day. As in her anorectic days, she was successful in hiding the food from her plate in her pockets and under the table without her parents noticing it. She was very much ashamed of her behavior and at first refused even to talk about it, either in individual or in group therapy.

Research on chewing and spitting is sparse. Chewing and spitting is more commonly associated with other restrictive eating disorder behaviors (such as diet pill abuse, dietary restriction, and excessive exercise) than with binge/purge behaviors. The behavior may be frequent and it may be associated with greater psychopathology.

Chewing and spitting is also associated with more severe eating disorder symptoms and suicidal ideation. Individuals who chew and spit, relative to other patients with eating disorders who do not chew and spit, have higher scores on measures of body image concerns, preoccupation with shape and weight, depression, anxiety, and obsessive-compulsive behavior.

If you are having suicidal thoughts, contact the National Suicide Prevention Lifeline at 1-800-273-8255 for support and assistance from a trained counselor. If you or a loved one are in immediate danger, call 911.

For more mental health resources, see our National Helpline Database.

Among eating disorder patients admitted to a behavioral, inpatient, and partial hospitalization program for eating disorders that consented to participate in a study by Guarda and colleagues, 34% admitted to at least one episode of chewing and spitting in the month prior to admission, and 19% reported being regular chewers/spitters who engaged in the behavior several times a week.

In their paper, Guarda and colleagues report "The behavior is described as driven and compelling and is sometimes associated with feelings of loss of control. As with most eating disorder behaviors, its escalation can lead to social exclusion, severe food obsession, self-loathing, guilt, and remorse. For individuals who chew and spit large amounts of food daily, financial difficulties can be a further consequence.”

In a study of Korean patients with eating disorders, 25% engaged in chewing and spitting. The prevalence of chewing and spitting out food has been estimated to be about 31% of patients post-bariatric surgery. More recently, a publication from the Cleveland Clinic group found that approximately 4.2% of those in their sample experienced chewing and spitting out food (CHSP) after bariatric surgery. While the condition is relatively rare, they caution that it is "concerning given its relationship to other psychological conditions and ED behaviors."

A Patient's View

A review of studies of chewing and spitting indicates that the behavior is used as a weight-control method and “was often associated with negative emotions such as self-disgust, remorse, and shame, but may have been less distressing than binging and purging."

In online communities, patients who chew and spit report a great deal of shame about the behavior. It is also described as a behavior that becomes driven and compulsive and very hard to stop. There is often great secrecy around the behavior and those who engage in chewing and spitting may become isolative as they try to conceal it.

Medical Consequences

While it may seem like a relatively benign symptom, especially as compared to vomiting, the consequences of chewing and spitting may be quite serious.

Symptoms of chewing and spitting are similar to those found with vomiting in bulimia nervosa and can include:

Addressing these medical symptoms requires stopping the behavior. Warm compresses and tart candies can help provide relief for swollen salivary glands. Patients should see a medical doctor and a dentist to discuss potential treatment options for gastrointestinal, hormonal, and dental issues.

Assessing and Treating Chewing and Spitting

Chewing and spitting is not commonly assessed by professionals, and clients may be reluctant to report it due to shame about the behavior.

Little in the treatment literature specifically address chewing and spitting. Psychotherapy and nutrition therapy for patients with eating disorders who chew and spit should address the normalization of eating behaviors through the adoption of regular meals. Cognitive-behavioral strategies helpful in addressing chewing and spitting include acknowledgment of feelings of shame, challenging of dietary rules, management of emotional distress, and practice of increased flexibility. The CBT strategies are similar to those used with other eating disorders and also include challenging irrational thoughts involving fear of food, fear of weight gain, and body image concerns.

Advice for Family Members

If your family member is displaying signs of an eating disorder, you may want to watch for signs of chewing and spitting. Specific signs of chewing and spitting may include:

  • Traces of chewed but undigested food in their room, in the bathroom, or in the trash
  • Eating in private or out of the house
  • Secretive behavior at meals
  • Shame around eating

If you (or someone you know) is chewing and spitting, it is important to seek help from a professional who is well-versed in eating disorders. 

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