Yes, many people with anorexia nervosa do binge eat. Roughly one in four people diagnosed with anorexia falls into the binge-eating/purging subtype, and over half of those initially diagnosed with the purely restrictive form eventually develop binge-eating behavior over time. Bingeing and starving are not opposite problems. They are deeply connected, and understanding why helps make sense of a condition that can look contradictory from the outside.
The Two Subtypes of Anorexia
Anorexia nervosa has two recognized forms. The restricting type involves weight loss through severe calorie restriction, fasting, or excessive exercise without regular binge-eating or purging episodes. The binge-eating/purging type involves the same dangerously low body weight and fear of gaining weight, but the person also regularly binges, purges (through self-induced vomiting or misuse of laxatives), or both within the past three months.
In clinical samples, the ratio between the two subtypes is approximately 3 to 1, with the restricting type being more common at the point of diagnosis. But that snapshot is misleading, because many people move between subtypes over the course of their illness.
Why Restriction Leads to Bingeing
Binge eating after prolonged restriction is not a failure of willpower. It is a predictable biological response to starvation. Animal research has consistently shown that food deprivation reliably increases subsequent food intake. When animals lose enough weight to reach 75 to 80 percent of their normal body weight, they begin showing binge-like eating even when they are not hungry. The body interprets severe calorie restriction as a survival threat and responds by ramping up the drive to eat.
This goes beyond simple hunger. Restriction changes how the brain’s reward system responds to food. Eating palatable foods activates dopamine-releasing neurons in the brain’s reward centers. After repeated cycles of restriction and refeeding, this system becomes sensitized. The pleasure signal from food gets amplified, making highly palatable foods feel almost irresistible. Rats trained to binge on sugar and then deprived of it show significantly decreased dopamine activity, a withdrawal-like pattern similar to what happens with addictive substances.
Stress compounds the problem. Research shows that animals exposed to cycles of restriction and refeeding, followed by even mild stress, dramatically increase their calorie intake. The extra calories come selectively from palatable foods, suggesting that stress-triggered binges are driven more by the brain seeking reward and relief than by metabolic need. The brain’s natural opioid system plays a role here too. Blocking opioid receptors in animal studies completely eliminated binge eating triggered by restriction plus stress.
For someone with anorexia, this creates a vicious cycle: restriction triggers powerful biological urges to binge, the binge triggers guilt and intensified restriction, and the renewed restriction sets the stage for the next binge.
What a Binge Looks Like in Anorexia
The clinical definition of a binge requires two things: eating an objectively large amount of food in a short period, and feeling a loss of control during the episode. But many people with anorexia experience what clinicians call subjective binges, episodes where they feel completely out of control but the actual amount of food consumed would not be considered large by most standards. Someone who has been eating 400 calories a day might feel they have binged after eating a normal-sized meal.
Both types of episodes cause significant distress. The subjective binge is particularly common in underweight individuals because their internal gauge for “too much food” has been recalibrated by months or years of restriction. Formally, only objectively large binges count toward a clinical diagnosis, but the psychological experience of losing control over eating is central to both.
How Often People Switch Between Subtypes
A seven-year follow-up study published in the American Journal of Psychiatry found that nearly 73 percent of people with anorexia experienced a shift in their diagnosis over time. Among those who started with the restricting type, 55 percent crossed over to the binge-eating/purging type, and 10 percent eventually met criteria for bulimia nervosa. These transitions were not one-time events. People moved back and forth between subtypes repeatedly throughout the follow-up period.
This pattern suggests that restricting anorexia and binge-eating/purging anorexia are not two separate conditions so much as two phases of the same illness. The longer someone lives with anorexia, the more likely they are to develop binge-eating behavior at some point.
How This Differs From Bulimia
The binge-eating/purging subtype of anorexia can look a lot like bulimia nervosa on the surface, since both involve cycles of bingeing and purging. The key distinction is weight. Anorexia nervosa involves significant weight loss, typically 15 percent or more below what would be expected. Bulimia nervosa, by definition, occurs in people at normal weight or above. When someone who is significantly underweight binges and purges, the diagnosis of anorexia takes precedence.
This matters because the combination of very low body weight and purging creates a particularly dangerous medical situation. The starvation-related complications of anorexia, like heart rhythm abnormalities and bone loss, get layered on top of the purging-specific risks.
Personality and Psychological Differences
Research comparing the two subtypes has found consistent psychological differences. People with the binge-eating/purging subtype tend to score higher on measures of impulsivity, emotional eating, and novelty seeking. They are more likely to eat in response to emotions and external cues rather than internal hunger signals. They also tend to score lower on self-directedness, a trait related to feeling in control of one’s own behavior and choices.
Interestingly, the personality profile of people with the binge-purge subtype of anorexia more closely resembles that of people with bulimia nervosa than it does the restricting subtype. This adds to the picture of eating disorders existing on a spectrum rather than in neat, fixed categories.
Health Risks of the Binge-Purge Subtype
People with the binge-eating/purging subtype face a combination of risks. The starvation itself causes problems across nearly every organ system: slowed heart rate, weakened bones, muscle wasting, hormonal disruption, and impaired immune function. Purging behaviors add a separate layer of complications. Repeated vomiting disrupts the body’s electrolyte balance, particularly potassium and sodium levels, which can cause dangerous heart rhythm disturbances. It also damages tooth enamel, irritates or tears the esophagus, and can cause swelling of the salivary glands along the jaw.
Laxative misuse leads to its own set of problems, including chronic dehydration and, over time, the colon becoming dependent on laxatives to function. The overlap of starvation and purging makes this subtype medically precarious, because the body has fewer reserves to buffer the electrolyte shifts that purging causes.