Eating Disorders and Fasting: Risks, Warning Signs, and Recovery

Fasting is going without food for a set period of time. It’s also become more popular in recent years. One common example is intermittent fasting for weight loss. There are also religious and cultural fasting practices. This is why many people see it as a normal or even healthy behavior.

However, fasting can lead to and reinforce eating disorders. Fasting may start as a structured eating pattern, but can become rigid, compulsive, and harmful. People with a history of disordered eating can have higher risk.

This article explores the connection between eating disorders and fasting. You’ll learn about downsides to fasting, the warning signs to watch for, and how to get help. If you or a loved one is struggling with an eating disorder, speak to a specialist today.

What is Fasting?

Fasting refers to abstaining from food (and sometimes drinks) for a specific period of time. It can take several different forms:

Intermittent Fasting: Cycling between eating and fasting windows (e.g., 16:8 method)
Religious Fasting: Practiced for spiritual reasons (e.g., Ramadan, Lent)
Extended Fasting: Going 24 hours or longer without food

Fasting is often framed as a health or lifestyle choice. It’s often promoted for weight loss, metabolic health, or mental clarity.

However, the intention behind fasting matters. For some, fasting is flexible and balanced. For others, it can become rigid, anxiety-driven, and tied to self-worth.

When Does Fasting Become Disordered?

Fasting can become disordered when it shifts from a choice to a compulsion. Healthy behaviors often allow for flexibility. Disordered fasting, on the other hand, often involves:

Rigid Rules: Feeling unable to break a fasting window, even when hungry
Emotional Distress: Anxiety, guilt, or panic when eating outside of planned times
Fear-Based Motivation: Fasting driven by fear of weight gain or loss of control
Loss of Body Awareness: Ignoring hunger, fatigue, or physical needs

A key distinction is why the fasting is happening. If it’s about controlling weight, avoiding food-related guilt, or compensating for eating, it may be part of a larger pattern of disordered eating.

How Fasting Relates to Eating Disorders

Fasting is linked to several eating disorder behaviors and patterns.

Fasting as Restriction

At its core, fasting is a form of restriction. It’s limiting food intake. And in eating disorders, restriction often plays a central role, whether it’s consistent or cyclical.

Fasting as a Compensatory Behavior

Some people use fasting after eating to “make up for” eating calories. This is common after binge eating or perceived overeating. This pattern mirrors other compensatory behaviors like purging or excessive exercise.

Fasting as a Trigger for Binge Eating

Biologically, restriction can increase hunger. When the body is deprived of energy:

Hunger hormones rise
Cravings intensify
The brain becomes more focused on food

This can lead to episodes of binge eating, followed by renewed fasting. This can create a repeating cycle.

Eating Disorders Commonly Linked to Fasting

Fasting can appear in multiple eating disorders. Although, it may look a little different in each. For a deeper dive into each disorder, click on the links below.

Anorexia Nervosa

People with anorexia often engage in severe restriction. This can include prolonged fasting. It’s often driven by an intense fear of weight gain and a strong need for control.

Bulimia Nervosa

In bulimia, fasting often occurs between binge episodes. Someone may restrict food intake during the day, and then binge later. They then return to fasting or other compensatory behaviors.

Binge Eating Disorder

BED doesn’t involve regular compensatory behaviors like purging. However, many people attempt to fast after a binge to “balance things out.” Unfortunately, this often increases the likelihood of future binges.

Other Specified Feeding or Eating Disorders (OSFED)

Some people don’t fit neatly into a single diagnosis. However, they can still have harmful patterns involving fasting, restriction, and bingeing.

To learn more, here’s an article that covers more eating disorders and therapies.

The Fasting–Binge Cycle Explained

Many people struggling with fasting and eating disorders are stuck in a loop:

Fasting or Restriction: Food intake is limited, often strictly
Increased Hunger and Cravings: The body responds to deprivation
Binge Eating: A loss of control leads to eating large amounts
Guilt and Shame: Emotional distress follows
Return to Fasting: The cycle begins again

This cycle isn’t a failure of willpower. Instead, it’s a predictable biological and psychological response to restriction.

Breaking the cycle can require professional support. Eating disorder experts can help address both the physical and emotional sides. To learn more, speak with a specialist today.

Signs Fasting May Be Part of an Eating Disorder

It’s not always obvious when fasting has become unhealthy. Here are some signs to watch for:

Behavioral Signs

Frequently skipping meals beyond structured fasting plans
Avoiding social situations that involve food
Increasing fasting periods over time
Feeling compelled to fast after eating

Emotional Signs

Anxiety about breaking a fast
Guilt or shame after eating
Feeling “in control” only when fasting
Preoccupation with food, weight, or timing meals

Physical Signs

Fatigue or low energy
Dizziness or lightheadedness
Digestive issues
Hormonal disruptions (e.g., missed periods)

If fasting is affecting your mental or physical well-being, it’s worth taking seriously.

Health Risks of Fasting in Eating Disorders

When combined with disordered eating, fasting can lead to health issues.

There can be many short-term effects. This can include: blood sugar instability, irritability and mood swings, difficulty concentrating, and weakness or fatigue.

For long-term issues, there can be slowed metabolism and hormonal imbalance. It can also lead to heart complications, bone density loss, and increased anxiety and depression.

The longer disordered fasting continues, the more these risks can compound.

Is Intermittent Fasting Safe for People with Eating Disorders?

For people with a current or past eating disorder, intermittent fasting is generally not recommended. Even when presented as a health strategy, intermittent fasting can:

Reinforce restrictive thinking
Trigger obsessive behaviors around food
Increase the risk of relapse

Recovery from an eating disorder can take many paths. It often involves rebuilding trust with the body, including responding to hunger cues. Fasting can interfere with recovery.

Why Fasting Can Feel Hard to Stop

Repeated fasting can be difficult to stop. It can become tied to emotional or psychological needs. Some reasons include:

A Sense of Control: Fasting can create structure in an otherwise chaotic emotional experience
Emotional Numbing: Hunger can dull certain feelings
Reinforcement Loops: Temporary relief from guilt can strengthen the behavior
Social Validation: Diet culture often praises restriction and discipline

These factors can make fasting feel rewarding. That’s even when it’s harmful in the long term.

How to Stop Disordered Fasting

Letting go of disordered fasting takes time and support. Here are some common starting points:

1. Reintroduce Regular Eating

Aim for consistent meals and snacks throughout the day. This can help stabilize blood sugar and reduce the urge to binge.

2. Break Rigid Rules

Challenge strict fasting windows. Even small shifts, like eating earlier than planned, can help rebuild flexibility.

3. Reconnect With Hunger Cues

Practice noticing hunger and fullness signals without judgment. This can take time, especially after prolonged restriction.

4. Address Underlying Thoughts

Explore beliefs around food, weight, and control. These often drive the behavior more than the food itself.

5. Seek Support

You don’t have to do this alone. Professional guidance can make a big difference. To learn more, speak with a specialist today.

Eating Disorder Treatment and Recovery Options

There are different ways to recover from eating disorders involving fasting. Treatment often includes a combination of approaches:

Therapy

Cognitive Behavioral Therapy can help address thought patterns and behaviors
Dialectical Behavior Therapy supports emotional regulation

Nutrition Counseling

Working with a registered dietitian can help you:

Rebuild a balanced relationship with food
Establish consistent eating patterns
Reduce fear around eating

Medical Support

Monitoring physical health is important. Fasting can negatively impact energy levels, heart health, or hormones.

Support Systems

Friends, family, and support groups can help. They can provide encouragement and accountability during recovery.

When to Seek Help

Is fasting difficult to control or impacting your health? If so, it may be time to seek help. Consider reaching out if:

You feel trapped in a fasting–binge cycle
Food and eating patterns are taking over your thoughts
You’re experiencing physical symptoms like dizziness or fatigue

Early support can make recovery more manageable and effective.

Supporting Someone Who is Fasting Excessively

If someone you care about is struggling, your approach matters. You might be able to help by:

Expressing concern without judgment
Avoiding comments about weight or appearance
Encouraging them to seek professional support

Focus on their overall well-being. That’s rather than trying to control their behavior.