Understanding Anorexia Nervosa

Anorexia (an-o-REK-see-uh) nervosa — often simply called anorexia — is an eating disorder characterized by an abnormally low body weight, an intense fear of gaining weight and a distorted perception of weight. People with anorexia place a high value on controlling their weight and shape, using extreme efforts that tend to significantly interfere with their lives. To prevent weight gain or to continue losing weight, people with anorexia usually severely restrict the amount of food they eat. They may control calorie intake by vomiting after eating or by misusing laxatives, diet aids, diuretics or enemas. They may also try to lose weight by exercising excessively. No matter how much weight is lost, the person continues to fear weight gain. Anorexia isn't really about food. It's an extremely unhealthy and sometimes life-threatening way to try to cope with emotional problems. When you have anorexia, you often equate thinness with self-worth. Anorexia, like other eating disorders, can take over your life and can be very difficult to overcome. But with treatment, you can gain a better sense of who you are, return to healthier eating habits and reverse some of anorexia's serious complications.

Symptoms

The physical signs and symptoms of anorexia nervosa are related to starvation. Anorexia also includes emotional and behavioral issues involving an unrealistic perception of body weight and an extremely strong fear of gaining weight or becoming fat.

It may be difficult to notice signs and symptoms because what is considered a low body weight is different for each person, and some individuals may not appear extremely thin. Also, people with anorexia often disguise their thinness, eating habits, or physical problems.

Physical symptoms

Physical signs and symptoms of anorexia may include:

Extreme weight loss or not making expected developmental weight gains
Thin appearance
Abnormal blood counts
Fatigue
Insomnia
Dizziness or fainting
Bluish discoloration of the fingers
Hair that thins, breaks, or falls out
Soft, downy hair covering the body
Absence of menstruation
Constipation and abdominal pain
Dry or yellowish skin
Intolerance of cold
Irregular heart rhythms
Low blood pressure
Dehydration
Swelling of arms or legs
Eroded teeth and calluses on the knuckles from induced vomiting

Some people who have anorexia binge and purge, similar to individuals who have bulimia. But people with anorexia generally struggle with an abnormally low body weight, while individuals with bulimia typically are normal to above normal weight.

Emotional and behavioral symptoms

Behavioral symptoms of anorexia may include attempts to lose weight by:

Severely restricting food intake through dieting or fasting
Exercising excessively
Bingeing and self-induced vomiting to get rid of food, which may include the use of laxatives, enemas, diet aids, or herbal products

Emotional and behavioral signs and symptoms may include:

Preoccupation with food, which sometimes includes cooking elaborate meals for others but not eating them
Frequently skipping meals or refusing to eat
Denial of hunger or making excuses for not eating
Eating only a few certain "safe" foods, usually those low in fat and calories
Adopting rigid meal or eating rituals, such as spitting food out after chewing
Not wanting to eat in public
Lying about how much food has been eaten
Fear of gaining weight that may include repeated weighing or measuring the body
Frequent checking in the mirror for perceived flaws
Complaining about being fat or having parts of the body that are fat
Covering up in layers of clothing
Flat mood (lack of emotion)
Social withdrawal
Irritability
Insomnia
Reduced interest in sex

When to see a doctor

Unfortunately, many people with anorexia don't want treatment, at least initially. Their desire to remain thin overrides concerns about their health. If you have a loved one you're worried about, urge her or him to talk to a doctor.

If you're experiencing any of the problems listed above, or if you think you may have an eating disorder, get help. If you're hiding your anorexia from loved ones, try to find a person you trust to talk to about what's going on.

Causes

The exact cause of anorexia is unknown. As with many diseases, it's probably a combination of biological, psychological and environmental factors.

Biological: Although it's not yet clear which genes are involved, there may be genetic changes that make some people at higher risk of developing anorexia. Some people may have a genetic tendency toward perfectionism, sensitivity and perseverance — all traits associated with anorexia.
Psychological: Some people with anorexia may have obsessive-compulsive personality traits that make it easier to stick to strict diets and forgo food despite being hungry. They may have an extreme drive for perfectionism, which causes them to think they're never thin enough. And they may have high levels of anxiety and engage in restrictive eating to reduce it.
Environmental: Modern Western culture emphasizes thinness. Success and worth are often equated with being thin. Peer pressure may help fuel the desire to be thin, particularly among young girls.

Risk factors

Anorexia is more common in girls and women. However, boys and men have increasingly developed eating disorders, possibly related to growing social pressures.

Anorexia is also more common among teenagers. Still, people of any age can develop this eating disorder, though it's rare in those over 40. Teens may be more at risk because of all the changes their bodies go through during puberty. They may also face increased peer pressure and be more sensitive to criticism or even casual comments about weight or body shape.

Genetics: Changes in specific genes may put certain people at higher risk of anorexia. Those with a first-degree relative — a parent, sibling or child — who had the disorder have a much higher risk of anorexia.
Dieting and starvation: Dieting is a risk factor for developing an eating disorder. There is strong evidence that many of the symptoms of anorexia are actually symptoms of starvation. Starvation affects the brain and influences mood changes, rigidity in thinking, anxiety and reduction in appetite. Starvation and weight loss may change the way the brain works in vulnerable individuals, which may perpetuate restrictive eating behaviors and make it difficult to return to normal eating habits.
Transitions: Whether it's a new school, home or job; a relationship breakup; or the death or illness of a loved one, change can bring emotional stress and increase the risk of anorexia.

Complications

Anorexia can have numerous complications. At its most severe, it can be fatal. Death may occur suddenly — even when someone is not severely underweight. This may result from abnormal heart rhythms (arrhythmias) or an imbalance of electrolytes — minerals such as sodium, potassium and calcium that maintain the balance of fluids in your body.

Other complications of anorexia include:

Anemia
Heart problems, such as mitral valve prolapse, abnormal heart rhythms or heart failure
Bone loss (osteoporosis), increasing the risk of fractures
Loss of muscle
In females, absence of a period
In males, decreased testosterone
Gastrointestinal problems, such as constipation, bloating or nausea
Electrolyte abnormalities, such as low blood potassium, sodium and chloride
Kidney problems

If a person with anorexia becomes severely malnourished, every organ in the body can be damaged, including the brain, heart and kidneys. This damage may not be fully reversible, even when the anorexia is under control.

In addition to the host of physical complications, people with anorexia also commonly have other mental health disorders as well. They may include:

Depression, anxiety and other mood disorders
Personality disorders
Obsessive-compulsive disorders
Alcohol and substance misuse
Self-injury, suicidal thoughts or suicide attempts

Prevention

There's no guaranteed way to prevent anorexia nervosa. Primary care physicians (pediatricians, family physicians and internists) may be in a good position to identify early indicators of anorexia and prevent the development of full-blown illness. For instance, they can ask questions about eating habits and satisfaction with appearance during routine medical appointments.

If you notice that a family member or friend has low self-esteem, severe dieting habits and dissatisfaction with appearance, consider talking to him or her about these issues. Although you may not be able to prevent an eating disorder from developing, you can talk about healthier behavior or treatment options.