Bulimia nervosa is an eating disorder defined by repeated episodes of eating large amounts of food in a short period (bingeing), followed by attempts to prevent weight gain through vomiting, excessive exercise, fasting, or misuse of laxatives (compensatory behaviors). It affects roughly 12.4 million people worldwide, with the highest rates of new cases appearing in people aged 15 to 19. The median age of onset is 18, and while it’s more common in women, the rate among men is growing faster.
The Binge-Purge Cycle
A binge episode feels distinctly different from ordinary overeating. During a binge, you consume a large quantity of food rapidly, often feeling unable to stop even when you want to. The foods chosen tend to be those you might otherwise restrict or consider “forbidden.” The episode typically happens in private and is followed by intense shame, guilt, or disgust.
What comes next is the compensatory behavior, the body’s “undoing” attempt. Self-induced vomiting is the most widely recognized form, but it’s far from the only one. Bulimia is classified into two subtypes. The purging type involves vomiting or misuse of laxatives, diuretics, or enemas. The non-purging type relies on excessive exercise or prolonged fasting to compensate. Both subtypes carry serious health risks, and many people cycle between different compensatory methods over time.
The cycle tends to be self-reinforcing. The brain’s reward system becomes wired to anticipate the relief that follows a binge or purge rather than responding normally to food itself. Over repeated episodes, the chemical signals involved in reward shift from the act of eating to the anticipation of the entire cycle, making the pattern harder to interrupt with willpower alone.
Who It Affects
Bulimia occurs across every demographic, but the numbers aren’t evenly distributed. Women are affected at roughly five times the rate of men, though that gap is narrowing. By 2030, projections estimate the prevalence in women will reach about 201 per 100,000 people, while in men it’s expected to climb to around 129 per 100,000.
Geographically, the highest rates appear in high-income regions. Australia has the world’s highest prevalence at roughly 882 per 100,000 people, followed by Monaco and Italy. Western Europe and high-income parts of Asia Pacific also rank well above the global average. Between 1990 and 2021, the total number of people living with bulimia increased by 67 percent, rising from about 7.4 million to 12.4 million cases globally.
What It Does to Your Body
The most dangerous physical consequence of bulimia is the disruption of electrolytes, particularly potassium. Repeated vomiting or laxative misuse depletes potassium levels, and the effects escalate quickly. When potassium drops to moderately low levels, the heart’s electrical rhythm begins to change in ways that are detectable on an EKG but may not produce obvious symptoms. Below a certain threshold, these rhythm disturbances can progress to life-threatening arrhythmias. Cardiac or respiratory arrest is the most frequent cause of sudden death in people with eating disorders.
The damage to teeth is often one of the first visible signs. Stomach acid from repeated vomiting erodes enamel, particularly on the inner (palatal) surfaces of the upper front teeth. Over time, the tooth crowns can literally “shell out,” losing their structure from the inside. Dentists often recognize this distinctive pattern before the person has disclosed their eating disorder. People with bulimia also tend to have more acidic saliva than average, which accelerates the erosion even between purging episodes. Other oral problems include gum disease, mouth ulcers, cracking at the corners of the lips, and chronic dry mouth.
Beyond the heart and teeth, bulimia can cause swollen salivary glands (giving the face a puffy appearance), chronic sore throat, acid reflux, and intestinal problems from laxative dependence. Dehydration is common and compounds the electrolyte imbalances.
The Mental Health Picture
Bulimia rarely exists in isolation. The core psychological feature is an intense overvaluation of body shape and weight, meaning your sense of self-worth becomes disproportionately tied to how your body looks. This isn’t garden-variety body dissatisfaction. It’s a persistent, distressing preoccupation that drives the restriction, which triggers the binge, which triggers the compensatory behavior.
Depression and anxiety frequently accompany bulimia. Perfectionism, low self-esteem, and difficulty managing emotions are common underlying traits. Some people also struggle with impulsive behaviors in other areas of life, such as substance use or compulsive spending. These co-occurring conditions don’t just sit alongside the eating disorder. They actively feed into it, making treatment more complex but also more important to address simultaneously.
How Bulimia Is Treated
The most effective treatment is a specialized form of talk therapy called Enhanced Cognitive Behavioral Therapy, or CBT-E. It’s a structured program of about 20 sessions, starting with twice-weekly appointments for the first four weeks, then tapering to weekly and eventually biweekly over roughly 20 weeks. The therapy targets the thought patterns that maintain the disorder, particularly the overvaluation of shape and weight. A “focused” version addresses those core issues directly, while a “broad” version also tackles perfectionism, low self-esteem, or relationship difficulties when they’re getting in the way of progress.
The results are meaningful. In a randomized controlled trial, about 58 percent of people receiving CBT-E met the criteria for recovery by the end of treatment, compared with 36 percent receiving standard care. By 80 weeks, the CBT-E recovery rate was around 61 percent. Sessions can also include significant others, such as a partner or family member, to support the process.
On the medication side, one antidepressant (fluoxetine, a type of SSRI) has been FDA-approved specifically for bulimia since 1994. At the higher dose typically prescribed for this condition, it reduced binge eating episodes by 67 percent and vomiting episodes by 56 percent in clinical trials. Medication is generally most effective when combined with therapy rather than used alone.
Recovery and Relapse
Long-term studies paint an encouraging but realistic picture. In a 7.5-year follow-up study, 74 percent of women with bulimia achieved full recovery, and 99 percent reached at least partial recovery. Those numbers are significantly better than for anorexia nervosa, where only 33 percent fully recovered in the same timeframe.
The harder reality is that about one-third of people who fully recover from bulimia will relapse. Researchers have not been able to identify reliable predictors of who will relapse and who won’t, which means ongoing awareness matters for everyone in recovery. The path is rarely linear. Setbacks don’t erase progress, and many people who relapse go on to recover again. Recovery, for most people, is measured in years rather than months.
Physical Signs That May Be Visible
Because bulimia often occurs at a normal body weight, it can be harder to recognize than other eating disorders. But certain physical clues exist. Swollen cheeks or jawline from enlarged salivary glands, erosion of tooth enamel, frequent sore throats, and bloodshot eyes (from the pressure of vomiting) are among the most common. Calluses or scars on the knuckles can develop from using fingers to induce vomiting, though not everyone who purges does so this way.
Behaviorally, signs include disappearing to the bathroom immediately after meals, evidence of large amounts of food being consumed, empty laxative or diuretic packages, rigid exercise routines that seem driven rather than enjoyable, and withdrawal from social eating situations. Many people with bulimia maintain their weight within a normal range, which is one reason the disorder can go undetected for years.