Anorexia nervosa affects roughly 1 in 100 people over the course of a lifetime when measured using current diagnostic criteria. That overall figure of about 0.9% masks wide variation by sex, region, and how researchers define the condition. The numbers also look very different depending on whether you’re asking how many people have it right now versus how many will experience it at some point in their lives.
Lifetime Prevalence by Sex
Anorexia is far more common in women than in men. Lifetime prevalence in females ranges from about 0.1% to as high as 3.6% depending on the country and study design, while in males the range is 0% to 0.3%. In the United States specifically, about 1.4% of women and 0.1% of men will meet diagnostic criteria at some point. The UK reports higher numbers for women, around 3.6%, and a Finnish study found rates as high as 6.2% in women and 0.3% in men.
The roughly 10-to-1 female-to-male ratio has held fairly steady across decades of research. That said, many experts believe anorexia in men is underdiagnosed because screening tools and cultural awareness have historically focused on women and girls. The true male prevalence is likely higher than these numbers suggest.
How Many People Have It Right Now
The 12-month prevalence, meaning the percentage of people who meet criteria for anorexia in any given year, is much smaller than the lifetime figure. In the U.S., about 0.08% of women and 0.01% of men have active anorexia nervosa at any point within a 12-month window. Finland again reports higher numbers: 2.4% of women and 0.2% of men in a given year. These differences likely reflect both genuine regional variation and differences in how thoroughly each country screens its population.
Why the Numbers Vary So Much
One major reason prevalence estimates differ is the diagnostic standard researchers use. When the American Psychiatric Association updated its criteria in 2013, it loosened two key requirements. Women no longer needed to have lost their menstrual period to qualify, and the weight threshold became less rigid. This change alone increased anorexia diagnoses by about 12% in clinical samples. In one study, the share of eating disorder patients diagnosed with anorexia jumped from 35% under the old criteria to 47% under the new ones. Many people previously categorized as having an unspecified eating disorder are now formally diagnosed with anorexia.
Study design matters too. Research that uses a two-stage approach, first screening a large population with questionnaires and then interviewing flagged individuals, consistently finds higher rates (1.7% to 3.6% in women) than studies relying on clinical interviews alone (0.8% to 1.9%). The two-stage method catches people who might never seek treatment or receive a formal diagnosis.
Who Is Most at Risk
The median age of onset is 18. Most cases begin during adolescence or early adulthood, though the condition can develop at any age, including in children under 12 and in adults over 40. About 72% of people diagnosed with anorexia have the restricting subtype, where weight loss comes primarily from limiting food intake. The remaining 28% have the binge-purge subtype, involving cycles of eating followed by compensatory behaviors like vomiting or laxative use.
Psychiatric conditions overlap heavily with anorexia. More than 70% of people with eating disorders have at least one co-occurring psychiatric diagnosis. Anxiety disorders appear in over half of cases, mood disorders like depression in over 40%, and personality disorders in more than 53%. These conditions can precede the eating disorder, develop alongside it, or persist after recovery.
Rates Are Climbing in Some Regions
In China, the incidence of anorexia among people under 45 has risen steadily over the past three decades, increasing by an average of 1.29% per year from 1992 to 2021. The trend held for both sexes, though annual increases were slightly steeper for women (1.37%) than men (1.25%). This upward trend persisted even after accounting for shifts in the age makeup of the population, suggesting it reflects a genuine increase rather than a statistical artifact. Similar patterns have been observed in other countries undergoing rapid economic development and cultural shifts around body image.
Recovery and Long-Term Outcomes
Anorexia has a slow recovery trajectory compared to other eating disorders. At a 9-year follow-up, only about 31% of people with anorexia had fully recovered. By 22 years, that figure rose to roughly 63%. For comparison, about 68% of people with bulimia nervosa had recovered by the 9-year mark, and that number held steady at 22 years. The remaining 37% of anorexia patients who hadn’t recovered after two decades included people with lingering symptoms as well as those who still met full diagnostic criteria.
Anorexia carries the highest mortality rate of any psychiatric disorder. The long timeline to recovery, combined with serious medical complications affecting the heart, bones, and organs, as well as elevated suicide risk, contributes to this. Early intervention significantly improves the odds of full recovery, particularly when treatment begins within the first few years of illness.
Why Reported Numbers Likely Undercount True Cases
Every prevalence figure for anorexia comes with an important caveat: these numbers reflect only people who were identified through surveys or clinical records. Many people with anorexia never seek treatment. In low- and middle-income countries, where mental health infrastructure is limited, reported rates are predictably lower. Iran reports a lifetime prevalence of just 0.1% in women, and Taiwan reports 0.2% overall, numbers that almost certainly reflect limited screening rather than a near-absence of the condition.
Even in wealthy countries with robust healthcare systems, shame and secrecy keep many cases hidden. Men, older adults, people of color, and individuals in larger bodies are particularly likely to go undiagnosed because they don’t match the stereotypical image of someone with anorexia. The true global burden of the condition is almost certainly higher than any published statistic suggests.