Eating disorders like anorexia nervosa and bulimia nervosa affect hundreds of thousands of Canadians. These are serious mental and physical health conditions — not lifestyle choices. This article explains what causes eating disorders, how doctors diagnose them, and what warning signs to watch for. Obesity is also covered here, as unhealthy relationships with food and body image can affect people at any weight.
What Causes Eating Disorders?
Eating disorders rarely have a single cause. They usually develop from a combination of factors working together over time.
Common contributing factors include:
Social pressure to be thin or to meet an “ideal” body type
A vulnerable or perfectionistic personality
Distorted body image — seeing yourself differently than others see you
Overestimating the benefits of losing or gaining weight
Strict dieting, especially during critical periods like adolescence
These pressures can lead to deeply rooted eating disorders such as anorexia nervosa and bulimia nervosa. Over time, what starts as calorie restriction can grow into serious problems with self-worth, mood, and relationships.
People with eating disorders often feel an intense, irrational fear of gaining weight. They may also have a distorted view of their own body. These thought patterns separate eating disorders from other medical conditions that cause weight changes.
How Common Are Eating Disorders in Canada?
Reported cases of anorexia and bulimia have been rising across Canada, the United States, and Europe over recent decades. This reflects both a true increase in cases and better diagnosis.
Here is what the data shows:
About 0.5–1% of Canadian women meet the full criteria for anorexia nervosa
Between 2–4% of female university students meet the criteria for bulimia nervosa
About 5% of female students show partial symptoms of one or both conditions
Women are affected approximately six times more often than men
However, men and boys are increasingly affected too. Since the 1950s, both men and women have become more focused on physical appearance and body size. Research shows that about 75% of women feel overweight, while only about 25% actually are.
For a broader look at how eating disorders affect Canadians, visit the Health Canada nutrition and healthy eating resources.
Recognising the Signs of Eating Disorders
Early diagnosis gives people a much better chance of full recovery. Unfortunately, the first signs of anorexia or bulimia are often subtle and easy to miss.
Physical Warning Signs
Watch for these physical symptoms:
Significant weight loss from starvation or excessive exercise
Loss of menstrual periods (amenorrhea)
Stomach pain or bloating
Severe weight loss leading to malnutrition
Tooth enamel erosion from repeated vomiting
Inflammation of the esophagus (esophagitis)
Thinning hair, sometimes resembling fine infant hair
Bone fractures from minor injuries due to reduced bone density
Regular use of laxatives or diuretics
Decreased sex drive
Laboratory and Medical Warning Signs
A doctor may find these results during testing:
Metabolic alkalosis — reduced normal acidity, often from repeated vomiting
Low potassium levels (hypokalaemia) from vomiting or laxative misuse
Anaemia — low haemoglobin in the blood
Low levels of estrogen or testosterone
Elevated prolactin levels, which can lead to infertility
Osteopenia — lower than normal bone density
These findings, combined with the emotional and behavioural signs, help doctors distinguish eating disorders from other conditions. For example, thyroid problems, diabetes, malabsorption disorders, and some cancers can also cause weight loss. However, the intense fear of weight gain seen in anorexia nervosa sets it apart from purely physical illnesses.
Anorexia Nervosa: What You Need to Know
Anorexia nervosa is a condition where a person severely restricts food intake because of an intense fear of gaining weight. Despite being underweight, people with anorexia often see themselves as overweight.
There are two main patterns of behaviour in anorexia nervosa:
Restrictive type: The person limits food intake through strict dieting or fasting
Binge-purge type: The person restricts food but also has episodes of binge eating followed by purging
Anorexia is one of the most medically dangerous of all psychiatric conditions. Severe malnutrition can affect the heart, bones, kidneys, and hormonal systems. In the most serious cases, it can be fatal.
Furthermore, people with anorexia who also experience depression face a heightened risk of suicide. This is why early treatment and mental health support are so important.
Bulimia Nervosa: What You Need to Know
Bulimia nervosa involves cycles of binge eating followed by purging. Purging can include vomiting, using laxatives, or excessive exercise. Unlike anorexia, people with bulimia are often at a normal or near-normal weight — which can make the condition harder to spot.
The physical damage from bulimia is still very real. Repeated vomiting erodes tooth enamel and can inflame the esophagus. Electrolyte imbalances — especially low potassium — can affect the heart.
Emotionally, bulimia is often connected to feelings of shame, loss of control, and low self-esteem. The binge-purge cycle can feel impossible to break without professional support.
Learn more about the differences between these conditions at the Mayo Clinic’s eating disorders overview.
Understanding Obesity as an Eating and Weight Disorder
Obesity is usually caused by multiple factors at once — not simply a lack of willpower. In Canada, it is recognized as a complex, chronic health condition.
What Contributes to Obesity?
Beyond eating too much, common contributing factors include:
Genetic predisposition — studies on twins and adopted children confirm a hereditary link
Social norms and environmental pressures
Easy availability of high-calorie, low-nutrient foods
Co-existing medical, neurological, or psychiatric conditions
As a general rule, the more severe the obesity and the earlier it appears, the more likely that genetic or medical factors are involved. About 25% of people with obesity also experience episodes of binge eating or uncontrolled food cravings.
Health Risks of Obesity
Carrying excess weight significantly raises the risk of several serious conditions, including:
High blood pressure (hypertension)
High cholesterol (hypercholesterolaemia)
Type 2 diabetes
Endometrial cancer in women
Heart disease and other potentially life-threatening conditions
Morbid obesity — defined as weighing roughly twice the healthy norm — greatly increases the risk of cardiovascular disease and other serious complications.
In addition, research shows a paradox in developed countries: the wide availability of food has, in some ways, made healthy eating harder. Highly processed, calorie-dense foods are easy to access but offer poor nutritional value. The World Health Organization’s fact sheet on obesity and overweight provides helpful global context.
How the Body Normally Regulates Weight
The human body is remarkably good at keeping weight stable — when it is not disrupted by illness, psychological pressure, or sociocultural norms.
People who eat a balanced diet with moderate fat and sugar, exercise regularly, and manage everyday stress well tend to maintain a stable weight naturally. This built-in regulation works at an extremely fine level, adjusting hunger and fullness signals moment to moment.
However, eating disorders and obesity disrupt this natural balance. They interfere with the body’s normal hunger and satiety cues, making it very difficult for people to trust their own signals without professional guidance and support.
When to See a Doctor
If you notice any of the warning signs above — in yourself or someone you care about — it is important to speak with a healthcare provider as soon as possible. The earlier an eating disorder is diagnosed, the better the chances of full recovery.
In Canada, your first step is usually your family doctor. They can assess your symptoms, run appropriate lab tests, and refer you to a specialist or eating disorder programme. If you do not have a family doctor, a walk-in clinic can help with an initial assessment and referral.
Provincial health plans across Canada generally cover assessment and treatment for eating disorders, though wait times and available services vary by province. Ask your doctor what programmes are available in your area.
Do not wait until symptoms become severe. Early intervention saves lives — and a conversation with your doctor is always the right first step.
Frequently Asked Questions About Eating Disorders
What are the most common eating disorders in Canada?
The most common eating disorders in Canada are anorexia nervosa, bulimia nervosa, and binge eating disorder. All three involve an unhealthy relationship with food, body image, and weight. They can affect people of any age, gender, or background.
Can eating disorders be cured?
Yes — with the right treatment, many people recover fully from eating disorders. Recovery is most likely when the condition is caught early and treated with a combination of medical care, nutrition support, and mental health therapy. Your family doctor or a specialist can guide you toward the right programme.
Are eating disorders covered by provincial health insurance in Canada?
Most provincial health plans in Canada cover doctor visits, hospital care, and referrals related to eating disorders. Coverage for outpatient therapy or specialized eating disorder programmes varies by province. Ask your family doctor what services are available and covered in your area.
What is the difference between anorexia and bulimia?
Anorexia nervosa involves severely restricting food intake and an intense fear of gaining weight, often leading to dangerous weight loss. Bulimia nervosa involves cycles of binge eating followed by purging behaviours such as vomiting or laxative use. Both are serious eating disorders that require professional treatment.
Can men and boys have eating disorders?
Absolutely — eating disorders affect men and boys too, though they are diagnosed less often. Men may be less likely to seek help due to stigma, and symptoms can sometimes look different than in women. If you are concerned about your eating behaviours or body image, speak with your doctor regardless of your gender.
Is obesity considered an eating disorder?
Obesity itself is not classified as an eating disorder, but the two can be closely connected. About 25% of people living with obesity also experience binge eating disorder, which is a recognized eating disorder. Treating the underlying eating behaviour is an important part of managing obesity in these cases.
Key Takeaways
Eating disorders like anorexia and bulimia are serious medical and mental health conditions, not personal failures.
They are caused by a mix of social, psychological, and biological factors.
Early diagnosis significantly improves the chance of full recovery.
Physical warning signs include weight loss, hair thinning, dental erosion, and bone density loss.
Obesity is a complex, multi-factor condition linked to significant health risks including heart disease and diabetes.
If you or someone you know shows signs of an eating disorder, speak with a family doctor or visit a walk-in clinic promptly.
Provincial health plans in Canada generally cover assessment and treatment — you do not have to face this alone.
This article is for general information only. Always speak with a qualified healthcare provider for personal medical advice, diagnosis, or treatment.