Anorexia vs. Bulimia: Knowing These 4 Key Differences Can Improve Your Recovery

Bulimia Nervosa: Key Characteristics

Bulimia involves cycles of eating huge amounts of food (binging) and then trying to prevent weight gain through behaviors like throwing up. During binges, someone eats an excessive amount of food in a short window and feels like they can’t stop or control their eating.

After binging, people with bulimia try to “undo” the calories they ate by making themselves throw up, taking laxatives or diuretics, fasting, or exercising too much. Unlike people with anorexia, those with bulimia usually stay at a normal weight or slightly above, which makes the condition a lot harder for others to notice.

Physical signs of bulimia⁴ might include:

• Puffy cheeks
• Dental problems from stomach acid
• Calluses on knuckles from self-induced vomiting
• Weight that fluctuates up and down
• Stomach problems
• Imbalanced electrolytes
• Acid reflux
• Chronic sore throats
• Heartburn

The binge-purge cycle often happens in secret and makes people feel disgusted, guilty, or ashamed. Despite these negative feelings, the cycle is hard to break because both binging and purging can temporarily make emotional pain feel better. Like anorexia, bulimia involves intense worry about body shape and weight, but the approach to food is very different.

Major Differences Between Anorexia and Bulimia

Physical Appearance

The most obvious difference is how people with these disorders typically look. Those with anorexia are usually very underweight, while people with bulimia may maintain their normal weight or be slightly overweight. This means you can often see anorexia, while bulimia can stay hidden for years.

Eating Patterns

The eating patterns are also quite different. People with anorexia mainly restrict their food intake,⁵ eating very little or avoiding certain foods completely. People with bulimia swing between episodes of binge eating (eating large amounts of food at a time) and compensatory behaviors to try to get rid of those calories.

Relationship to Food

These conditions cause different feelings about food, too. People with anorexia tend to create strict rules about food and may feel anxious about eating. Those with bulimia typically feel out of control during binges, often eating foods they normally avoid, then desperately trying to counteract what they’ve eaten.

Emotional Experience

The emotional experience is different as well. Anorexia often brings a sense of accomplishment from restricting food and losing weight, while bulimia usually involves intense shame around binging and purging. 

Binge eating disorder (BED) and orthorexia survivor Elisa Aas describes how shame fueled the cycles of her disordered eating:⁶ 

You feel you abused food and your body so much you don’t deserve to enjoy food again.

Both of these conditions make people feel unhappy with their bodies, but how that shows up in behaviors is quite different.

Finding and diagnosing these disorders also follows different paths. Anorexia tends to be diagnosed earlier on⁷ because of visible weight loss, while bulimia’s secretive nature and normal-looking weight make it harder to notice from the outside. This difference can affect how quickly someone gets help, and what kind of help they need.

Key Similarities Between Anorexia and Bulimia

Though they may look different, anorexia and bulimia have important similarities. Both involve judging your self-worth largely based on your weight and body type. People with either condition often measure their value as a person by how they look⁸ or how well they can control their eating.

Risk Factors

Both anorexia and bulimia can come from similar risk factors,⁹ including genetics, personality traits like perfectionism, history of dieting, and cultural pressures around thinness. Traumatic experiences, family dynamics, and other mental health issues like anxiety or depression can contribute to both disorders.

Behaviors

Coping Mechanisms

There’s significant overlap between eating disorders,¹⁰ especially among people with anorexia. One study found that of the participants with anorexia, over half switched between the restricting and binge-eating/purging, and one-third developed bulimia. But interestingly, people initially diagnosed with bulimia nervosa rarely developed anorexia. So while diagnostic crossover is common in eating disorders, it tends to follow specific patterns. 

Both of these sets of behaviors serve as strategies for coping with difficult emotions and life stress. Behaviors like restricting food or binge-purge cycles temporarily relieve anxiety, distress, or emptiness. That emotional relief and sense of control¹¹ make both conditions very hard to overcome without addressing the underlying psychological needs they’re meeting.

Impacts on People’s Lives

Finally, both of these common eating disorders seriously impact people’s quality of life, causing distress and making it hard to function at work or in social settings. They isolate people from their support networks at a time when they need connection the most.

Health Risks and Complications

Anorexia and bulimia both cause serious health problems, but in different ways. 

Health Risks of Anorexia

Anorexia has the highest death rate¹² of any mental illness, with risks coming mainly from malnutrition that affects every system in the body. Severe malnutrition can cause: 

• Heart problems
• Bone loss
• Muscle wasting
• Hormone imbalances
• In the worst cases, organ failure

Health Risks of Bulimia

Bulimia’s health risks¹³ come mainly from purging behaviors. Frequent vomiting can cause:

• Irregular heartbeat from electrolyte imbalance
• Cardiac arrest in severe cases
• Damage to the digestive system
• Tooth erosion
• Swollen salivary glands

Overusing laxatives or diet pills can lead to:

• Laxative dependence
• Chronic digestive problems

Hormonal Imbalance

Both disorders can affect fertility and hormones. In anorexia, periods often stop¹⁴ due to low body weight and fat percentage. While people with bulimia may continue having periods, hormone disruptions can still happen, which can affect their fertility and bone health.

Long-Term Problems

Long-term problems differ somewhat between these 2 conditions. With anorexia, long-term malnutrition¹⁵ can lead to: 

• Permanent bone density loss and an increased risk of fractures
• Heart complications (bradycardia, arrhythmias, hypotension)
• Brain changes and cognitive impairment
• Reproductive issues 
• Pregnancy complications 
• Gastrointestinal problems
• Weakened immune function
• Electrolyte imbalances that affect multiple organ systems
• Increased overall mortality risk if left untreated

Bulimia’s long-term effects¹⁶ include: 

• Chronic digestive problems
• Dental complications (tooth decay, gum disease)
• Higher risk of esophageal cancer from repeated exposure to stomach acid
• Osteoporosis due to nutritional deficiencies
• Menstrual irregularities and reproductive problems
• High cholesterol 
• Increased risk of diabetes
• Heart irregularities and arrhythmias
• Severe dehydration and electrolyte imbalances
• Anemia

While some health issues like amenorrhea, acute dehydration, and certain heart problems may go away after recovery, others like osteoporosis, reproductive issues, diabetes risk, and cholesterol problems may need ongoing medical monitoring.

Medical Emergencies

If you experience fainting, chest pain, difficulty breathing, seizures, or blood in vomit, please seek emergency medical care immediately—these are not symptoms to ignore or push through. These signs indicate your body is in serious distress and requires urgent professional attention. We know reaching out to someone about an eating disorder can feel overwhelming, but regular medical supervision is absolutely essential to monitor and address these potentially life-threatening complications.

Treatment Approaches

There’s real hope for recovery from eating disorders—both anorexia and bulimia respond well to proper treatment,¹⁷ and many people go on to live healthy, fulfilling lives free from these struggles. While the journey has its challenges, effective treatments exist and are continually improving.

Treatment approaches for anorexia and bulimia share some similarities, but also have important differences tailored to each condition. For someone with anorexia, especially when their weight has become dangerously low, the first priority is ensuring medical stability and safety. This compassionate healthcare might include time in a hospital or inpatient treatment center where a team of medical professionals can help restore weight in a gentle, supportive way.

With bulimia, treatment typically focuses on breaking the cycles of binging and purging and rebuilding a healthier relationship with food. Outpatient therapy is often the starting point, but some people might need additional medical support to address health complications. 

People can and do recover, and build lifelong healthy relationships with food.⁶ As Aas says,

You deserve to eat, you deserve to recover from an eating disorder, you are worthy of love, you are worthy of acceptance—mainly from yourself.

Learn more about evidence-based approaches that can transform your journey to recovery in our guide to finding treatment for eating disorders.

Therapy

Both conditions benefit from psychotherapy, but the approaches might differ. For people with anorexia, family-based treatment (FBT)¹⁸ shows strong results, especially for adolescents. This approach empowers their family members to take an active role in their recovery.

For bulimia, cognitive behavioral therapy (CBT) is often the go-to treatment. It helps people identify unhelpful thought patterns, develop regular eating habits, and learn healthier ways to cope with their feelings. 

Both conditions can also benefit from dialectical behavior therapy (DBT),¹⁹ which teaches skills for managing emotions and relationships.

Nutritional Counseling

Nutritional counseling plays a major role in treating both disorders, though the goals differ. For anorexia, the focus is on gradually increasing food intake and expanding variety. For bulimia, establishing regular eating patterns and challenging food rules is key to breaking the binge-purge cycle.

Medication

Medication has a more established role in bulimia treatment, with certain antidepressants showing effectiveness in reducing binge-purge behaviors.²⁰ For anorexia, medication is less commonly the primary treatment but may help with co-occurring conditions like anxiety or depression.

Compassionate, Comprehensive Recovery and Support for Eating Disorders

Healing from an eating disorder takes both professional guidance and loving support. The journey looks different for everyone—people with anorexia may start with rebuilding their physical health, while people with bulimia may focus on establishing gentle routines.

When friends and family create spaces free of food judgment, recovery flourishes. And with compassionate professionals by your side, even setbacks become stepping stones.

Many people with these conditions find their way to complete recovery. Your struggle isn’t a personal failure—it’s a health condition that responds to care. If you’re suffering, find an eating disorder treatment program that meets your needs and reach out to a specialist today. 

You deserve support, and healing is within reach.

FAQs

Q: What causes anorexia and bulimia? 

A: These eating disorders develop from a mix of genetics, personality traits, family dynamics, and social pressures. Things like perfectionism, stress, and cultural beauty standards also play a huge role. They’re not choices or personality flaws—they’re serious health conditions that need supportive care.

Q: How do you know if someone has bulimia? 

A: Signs of bulimia include sneaking off to the bathroom after meals, swollen cheeks, calluses on knuckles, excessive exercise, dental issues, and missing food. People with bulimia often succeed in keeping it hidden because their weight might not change much, but they struggle in secret.

Q: Will I ever accept being at a normal body mass index (BMI)? 

A: Healing takes time, but yes, many people learn to feel comfortable in their bodies with the right support. Therapy helps challenge negative thoughts, and focusing on what your body can do instead of just how it looks can make a big difference.

Q: What are the first steps in getting help? 

A: Start by talking to your therapist, doctor, or someone you trust. You can also use an independent, non-biased treatment finder or call the National Eating Disorders Association helpline (1-800-931-2237). A specialist can help figure out the best plan for you.