What people with eating disorders eat varies dramatically depending on the type of disorder, but nearly all eating disorders involve a distorted relationship with food where certain items become “safe” and others become “forbidden.” In restrictive disorders, a person might survive on a narrow list of low-calorie foods eaten in tiny, carefully measured portions. In binge-related disorders, thousands of calories of highly palatable food can be consumed in a single sitting. The specifics look different from person to person, but the patterns are remarkably consistent within each diagnosis.
Restrictive Eating in Anorexia
People with anorexia nervosa typically eat small amounts of low-calorie foods they consider “safe.” These safe foods tend to share a few traits: they’re low in fat, low in sugar, and easy to count or measure. Common examples include plain vegetables, rice cakes, specific fruits, egg whites, and diet or sugar-free products. The list is personal and often shrinks over time as more foods get reclassified as dangerous.
The restriction goes beyond just choosing certain foods. People with anorexia often develop elaborate rituals around eating: cutting food into very small pieces, counting the exact number of bites per meal, arranging food on a plate in specific patterns, or eating items in a fixed order. Some count mouthfuls according to a number that feels “correct” or “just right.” Others weigh every portion on a kitchen scale. These rituals serve as a way to limit intake while also managing the anxiety that eating produces.
Over time, chronic undereating forces the body to adapt. The resting metabolic rate drops significantly. In one study of severely underweight patients with anorexia (average BMI of 14.5, compared to a healthy range of 18.5 to 24.9), resting energy expenditure averaged only about 920 calories per day. The body slows down its calorie burning by losing muscle mass and shifting hormone levels, including changes in thyroid function and stress hormones. This metabolic slowdown is a survival mechanism, but it also means the body becomes less and less efficient at processing nutrients even when food is available again.
What Happens During a Binge
Binge eating looks nothing like restrictive eating. A clinical binge is defined as eating an amount of food that is clearly larger than most people would eat in a similar timeframe, typically within about two hours, while feeling unable to stop. The key feature is that sense of lost control.
In binge eating disorder, a single episode ranges from roughly 1,500 to nearly 3,000 calories on average, though individual episodes can reach nearly 5,000 calories. In bulimia nervosa, where binges are followed by purging, the calorie range tends to be even higher: 3,000 to 4,500 calories per episode in laboratory studies. For comparison, a typical meal for someone without an eating disorder contains around 470 to 850 calories.
The foods chosen during binges are strikingly consistent. Research identifies the most representative binge foods as potato chips, pizza, pasta, macaroni and cheese, hamburgers, mashed potatoes, cookies, ice cream, chocolate bars, and cake. These are calorie-dense, highly palatable, and often soft-textured or easy to eat quickly. Speed matters during a binge because the episode is driven by compulsion, not hunger. People often describe eating so fast they barely taste the food.
How Bulimia Splits Food Into Categories
People with bulimia nervosa tend to mentally divide all food into two rigid categories: safe foods and forbidden foods. Safe foods are those perceived as healthy or low-calorie, like fruits, vegetables, and plain grains. Forbidden foods are typically snack foods and desserts. This binary classification drives the binge-purge cycle. During periods of control, only safe foods are allowed. When a forbidden food is eaten, even in a small amount, the person may define it as a binge regardless of how many calories were actually consumed.
This means a binge in someone’s mind doesn’t always match the clinical definition. A person with bulimia could eat a single cookie from their forbidden list and experience the same guilt and urge to purge as if they’d consumed an entire box. The emotional weight of the food matters more than the caloric content. Conversely, eating a large volume of “safe” foods like fruits and vegetables might not register as a binge at all, even if the calories are equivalent to a candy bar.
Orthorexia and the Obsession With “Pure” Food
Orthorexia involves an extreme fixation on eating only foods considered pure, clean, or healthy. Unlike anorexia, the primary concern isn’t calories or weight but the perceived quality of what’s being consumed. People with orthorexia develop rigid rules about sourcing, preparation, and nutritional content. They may eliminate entire food groups based on self-imposed standards for purity.
Common restrictions include avoiding anything processed, anything containing preservatives or artificial ingredients, foods that aren’t organic, or foods that have been cooked rather than eaten raw. Some individuals become fixated on consuming only raw or unprocessed foods, which can paradoxically increase the risk of foodborne illness. The diet narrows progressively. What starts as a reasonable interest in healthy eating becomes so restrictive that it interferes with daily life, social relationships, and eventually nutritional adequacy. Meals with friends or family become sources of intense anxiety because the food can’t be fully controlled.
Avoidance of Food in Social Settings
Across nearly all eating disorders, social situations involving food become a source of stress. People with restrictive disorders may avoid gatherings entirely or develop strategies to appear to eat without actually doing so: pushing food around a plate, claiming they already ate, citing food allergies or stomach problems, or serving others while skipping their own meal. Mealtimes at home often become tense for families, as the rituals and avoidance become harder to hide over time.
For those with binge eating disorder, the avoidance works differently. Bingeing typically happens alone, in secret, because of the shame involved. Social meals may be eaten normally or even sparingly, with the disordered eating happening later in private. This secrecy is part of why binge eating disorder often goes undiagnosed for years.
Nutritional Consequences of These Patterns
Regardless of which foods are chosen, eating disorder patterns create significant nutritional gaps. A study of 374 severely malnourished anorexia patients found that 64% were deficient in zinc, 54% were deficient in vitamin D, 37% were low in copper, and 21% lacked adequate selenium. About 15% were deficient in vitamin B1, a nutrient critical for nerve and heart function. These deficiencies are the direct result of restricting both the amount and variety of food consumed.
Binge eating creates its own nutritional problems, though they’re less obvious. A diet heavy in the calorie-dense, nutrient-poor foods typical of binges can lead to excess calories paired with inadequate vitamins and minerals. In bulimia, purging compounds the issue by preventing the body from absorbing nutrients from whatever food was consumed, while also depleting electrolytes that are essential for heart rhythm and muscle function.
The physical toll accumulates regardless of which eating disorder is involved. What a person with an eating disorder eats, or doesn’t eat, reflects patterns of control, fear, and compulsion rather than hunger or preference. The specific foods vary, but the underlying disruption in the relationship between food and the body is consistent across diagnoses.