Risk Factors:

Many factors contribute to the risk of developing an eating disorder. In the United States, about 7 million females and 1 million males suffer from eating disorders.

Age

Eating disorders occur most often in adolescents and young adults. However, they are becoming increasingly prevalent among young children. Eating disorders are more difficult to identify in young children because they are rarely suspected.

Gender

Studies indicate that eating disorders occur predominantly among girls and women. About 90 - 95% of patients with anorexia nervosa, and about 80% of patients with bulimia nervosa, are female.

Ethnic Factors

Most studies of individuals with eating disorders have been conducted using Caucasian middle-class females. However, eating disorders also affect people of other races.

Socioeconomic Factors

Living in any economically developed nation on any continent appears to pose a risk for eating disorders. Within nations, eating disorders can affect people of all socioeconomic levels.

Personality Disorders

People with eating disorders tend to share similar personality and behavioral traits, including low self-esteem, dependency, and problems with self-direction. Specific psychiatric personality disorders may put people at higher risk for eating disorders.

Avoidant Personalities. Some studies indicate that many patients with anorexia nervosa have avoidant personalities. This personality disorder is characterized by:

• Being a perfectionist
• Being emotionally and sexually inhibited
• Having less of a fantasy life than people with bulimia or those without an eating disorder
• Being perceived as always being "good," not being rebellious
• Being terrified of being ridiculed or criticized or of feeling humiliated

People with anorexia are extremely sensitive to failure, and any criticism, no matter how slight, reinforces their own belief that they are "no good".

Obsessive-Compulsive Personality. Obsessive-compulsive personality defines certain character traits (being a perfectionist, morally rigid, or preoccupied with rules and order). This personality disorder has been strongly associated with a higher risk for anorexia. These traits should not be confused with the anxiety disorder called obsessive-compulsive disorder (OCD), although they may increase the risk for this disorder.

Borderline Personalities. Borderline Personality Disorder (BPD) is associated with self-destructive and impulsive behaviors. People with BPD tend to have other co-existing mental health problems, including eating disorders.

Narcissistic Personalities. Studies have also found that people with bulimia or anorexia are often highly narcissistic and tend to:

• Have an inability to soothe oneself
• Have an inability to empathize with others
• Have a need for admiration
• Be hypersensitive to criticism or defeat

Accompanying Emotional Disorders

Many patients with eating disorders experience depression and anxiety disorders. Depression, anxiety, or both is also common in families of patients with eating disorders. It is not clear if emotional disorders, particularly obsessive-compulsive disorder (OCD), cause the eating disorders, increase susceptibility to them, or share common biologic cause.

Obsessive-Compulsive Disorder (OCD). Obsessive-compulsive disorder is an anxiety disorder that occurs in up to two thirds of patients with anorexia and up to one third of patients with bulimia. In fact, some doctors believe that eating disorders are variants of OCD. Obsessions are recurrent or persistent mental images, thoughts, or ideas, which may result in compulsive behaviors (repetitive, rigid, and self-prescribed routines) that are intended to prevent the manifestation of the obsession. Women with anorexia and OCD may become obsessed with exercise, dieting, and food. They often develop compulsive rituals (weighing every bit of food, cutting it into tiny pieces, or putting it into tiny containers). The presence of OCD with either anorexia or bulimia does not, however, appear to have any influence on whether a patient improves or not.

Obsessive-compulsive disorder is an anxiety disorder characterized by an inability to resist or stop continuous, abnormal thoughts or fears combined with ritualistic, repetitive, and involuntary defense behavior.

Other Anxiety Disorders. A number of other anxiety disorders have been associated with both bulimia and anorexia, including:

• Phobias. Phobias often precede the onset of the eating disorder. Social phobias, in which a person is fearful about being humiliated in public, are common in both types of eating disorders.
• Panic Disorder. Panic disorder often follows the onset of an eating disorder. It is characterized by periodic attacks of anxiety or terror (panic attacks).
• Post-Traumatic Stress Disorder. Many women with serious eating disorders report a past traumatic event, and many exhibit symptoms of post-traumatic stress disorder (PTSD) -- an anxiety disorder that occurs in response to life-threatening circumstances.

Depression. Depression is common in people with eating disorders, for both anorexia and bulimia. Major depression is unlikely to be a cause of eating disorders, however, because treating and relieving depression rarely cures an eating disorder. In addition, depression often improves after anorexic patients begin to gain weight.

Being Overweight

Extreme eating disorder behaviors, including use of diet pills, laxatives, diuretics, and vomiting, are reported more often in overweight than normal weight teenagers.

Body Image Disorders

Body Dysmorphic Disorder. Body dysmorphic disorder (BDD) involves a distorted view of one's body that is caused by social, psychologic, or possibly biologic factors. It is often associated with anorexia or bulimia, but it can also occur without any eating disorder. People with this disorder commonly suffer from emotional disorders, including obsessive-compulsive disorder and depression. As part of obsessive thinking, some people with BDD may obsess about a perceived deformity in one area of their body, and may repeatedly seek cosmetic surgery to "correct" it. People with BDD are also at higher risk for suicidal thinking and attempts.

Muscle Dysmorphia. Muscle dysmorphia is a form of body dysmorphic disorder in which the obsession involves musculature and muscle mass. It tends to occur in men who perceive themselves as being underdeveloped or "puny," which results in excessive body building, preoccupation with diet, and social problems. Such individuals are prone to eating disorders and other unhealthy behaviors, including the use of anabolic steroids.

Excessive Physical Activity

Highly competitive athletes are often perfectionists, a trait common among people with eating disorders.

Female Athletes. Excessive exercise is associated with many cases of anorexia (and, to a lesser degree, bulimia). In young female athletes, anorexia postpones puberty, allowing them to retain a muscular boyish shape without the normal accumulation of fatty tissues in breasts and hips that may blunt their competitive edge. Many coaches and teachers compound the problem by overstressing calorie counting and loss of body fat.

In response, people who are vulnerable to such criticism may lose excessive weight, which has been known to be deadly even for famous athletes. The term "female athlete triad" is a common and serious disorder that affects young female athletes and dancers. It includes:

• Eating disorders, including anorexia
• Amenorrhea (absent or irregular menstruation)
• Osteoporosis (bone loss, which is related to low weight)

Male Athletes. Male wrestlers and lightweight rowers are also at risk for excessive dieting. Many high school wrestlers use a method called weight-cutting for rapid weight loss. This process involves food restriction and fluid depletion by using steam rooms, saunas, laxatives, and diuretics. Although male athletes are more apt to resume normal eating patterns once competition ends, studies show that the body fat levels of many wrestlers are still well below their peers during off-season and are often as low as 3% during wrestling season.

Men and Women in the Military. Studies also show a higher-than-average risk for eating disorders in men and women in the military. A study of eating behavior on one Army base reported that 8% of the women had an eating disorder, compared to 1 - 3% in the civilian female population.

Vegetarianism

In general, vegetarianism, with careful planning, is a healthy practice for both adults and adolescents. Studies report, however, that vegetarianism in adolescence may be a risk factor for eating disorders in both males and females. Vegetarian teens have been found to be twice as likely to diet frequently, four times as likely to intensively diet, and eight times as likely to use laxatives as their non-vegetarian peers.

These studies do not mean that being a vegetarian equates with having an eating disorder. They do suggest, however, that parents with children who suddenly become vegetarians should be sure that their children are eating a balanced meal with sufficient protein, calories, and important minerals, such as calcium. Parents also might suspect anorexic behavior in their child under certain conditions:

• If the child has stopped eating meat only to avoid fat rather than from other motives, such as love of animals or to improve health.
• If the vegetarian diet coincides with rapid weight loss.
• If the child avoids important vegetable products because of calories (such as whole grains) or because of fats and oils (such as tofu, nuts, and dairy products).

Diabetes or Other Chronic Diseases

Eating disorders may be more common in teenagers with chronic illness, such as diabetes or asthma. Some recent research suggests an endocrinological link between obesity, diabetes, and eating disorders.

Diabetes. Eating disorders are particularly serious problems for people with either type 1 or type 2 diabetes.

• Binge eating (without purging) is most common in type 2 diabetes and, in fact, the obesity it causes may even trigger this diabetes in some people.
• Both bulimia and anorexia are common among young people with type 1 diabetes. The combination of diabetes and an eating disorder can have serious health consequences. Some women with diabetes often omit or underuse insulin in order to control weight. If such patients develop anorexia, their extremely low weight may appear to control the diabetes for a while. Eventually, however, if they fail to take insulin and continue to lose weight, these patients develop life-threatening complications.

Early Puberty

There is a greater risk for eating disorders and other emotional problems for girls who undergo early menarche and puberty, when the pressures experienced by all adolescents are intensified by experiencing these early physical changes, including normal increased body fat.