The warning signs of an eating disorder usually show up first in behaviour and mood, such as growing preoccupation with food or body shape, changes in eating patterns, withdrawal, secrecy, and self-worth becoming tied to appearance. Physical signs can follow. Because appearance is not a reliable guide, the behavioural and emotional changes are often what loved ones notice first, and they are reason enough to seek help.
Read this first: an eating disorder is a serious medical and psychiatric illness. You do not need to be certain, and a person does not need to look unwell, before concern is justified. If you recognise a pattern of these signs in yourself or someone else, that is a reason to talk to a doctor. If there are signs of physical danger, such as fainting, chest pain, severe weakness, or any thoughts of self-harm, treat it as urgent and seek emergency medical help now.
Eating disorders vary between people and between the different types, so no one will show every sign, and the presence of a few signs does not confirm a diagnosis, which only a professional can make. What follows groups the common warning signs into three areas. The signs are described in general, non-specific terms on purpose: the aim is recognition, never instruction.
One point is worth stressing before the signs themselves, because it changes how they should be read: you cannot tell whether someone has an eating disorder by looking at them. Many people who are seriously unwell are not underweight and appear physically well, and someone's size or shape says nothing about how much they are struggling or how much medical risk they carry. This is exactly why the behavioural and emotional signs below matter so much. They are usually the first and clearest indication that something is wrong, and they deserve to be taken seriously long before, and regardless of whether, any physical change becomes visible.
Behavioural signs
Changes in what a person does around food and eating are frequently the earliest and most visible warning signs, and are often noticed by others before anything else.
Changed eating patterns
Noticeable changes in how, what, or when someone eats: skipping meals, eating in a rigid or ritualised way, cutting out whole groups of food, or eating patterns that swing between extremes. New or intense rules around food are a common thread.
Secrecy and avoidance
Avoiding meals with others, making excuses not to eat in company, eating alone or in secret, or becoming evasive when food comes up. Social withdrawal, especially from occasions involving food, is common.
Preoccupation and control
A great deal of time and mental energy spent on food, eating, weight, or body shape: frequent checking of the body, intense focus on food, or distress when routines around eating are disrupted.
Compensating behaviours
Repeated attempts to counteract or undo eating, or to change the body through extreme means. These behaviours are often hidden and are a serious warning sign that professional help is needed, whatever form they take.
Emotional and psychological signs
Beneath the behaviours there is almost always emotional distress. These inner signs can be harder to see from the outside but are central to what an eating disorder is.
Self-worth tied to weight or shape
A sense that one's value as a person depends heavily on weight, body shape, or eating. How the day feels can hinge on these things, and criticism of the body can feel like criticism of the whole self.
Anxiety, guilt, and shame
Intense anxiety around eating, and strong guilt or shame connected to food or the body. Mealtimes may become fraught, and there can be great secrecy driven by shame.
Low mood and withdrawal
Persistent low mood, irritability, loss of interest, and pulling away from friends and activities. Anxiety and depression often accompany eating disorders and can deepen over time.
Distorted body experience
A view of one's own body that does not match reality, or a preoccupation with perceived flaws. The way the body is experienced can be a source of constant, painful distress.
Physical signs
Physical effects can appear at any stage and can be serious, but they often come later than the behavioural and emotional changes, which is exactly why waiting for physical signs is risky. These are described only in general terms.
Tiredness and weakness
Persistent fatigue, low energy, dizziness, fainting, or feeling weak. The body may struggle to keep up with everyday demands.
Feeling cold and other bodily changes
Feeling cold much of the time, changes to skin, hair, or nails, digestive discomfort, or other bodily changes. These reflect a body under strain.
Disrupted body functions
Disruption to normal bodily cycles and functions, including changes that a doctor would take seriously. The body's rhythms can be affected in ways that need medical attention.
Warning signs of medical risk
Fainting, chest pain, an irregular or racing heartbeat, severe weakness, or confusion are signs of potential medical danger and mean urgent help is needed straight away.
Signs worth taking seriously
Concern does not have to wait for certainty. If several of the following ring true, for you or for someone you care about, it is worth talking to a doctor. You are not overreacting by seeking help early.
- A growing amount of time and worry is going into food, eating, weight, or body shape.
- Eating patterns have changed noticeably, or there are new and rigid rules around food.
- There is withdrawal from meals, from social situations involving food, or from people generally.
- Self-worth or mood seems to rise and fall with weight, shape, or eating.
- There is secrecy, guilt, or shame around food, or distress when eating routines are disrupted.
- There are physical effects such as tiredness, dizziness, feeling cold, or other bodily changes.
- Any of it is interfering with health, relationships, work, study, or everyday life.
If in doubt, reach out. None of these signs alone proves an eating disorder, and only a professional can assess and diagnose one. But you do not need a diagnosis to deserve support. Speaking to a doctor early is one of the most helpful things you can do, and it is always better to raise a concern that turns out to be nothing than to wait too long.
Where to go next
Sources
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR). 2022.
- Beat. Eating disorder symptoms and warning signs. Accessed 2026.
- National Institute for Health and Care Excellence. Eating disorders: recognition and treatment (NG69). 2017.
This page is educational and is not medical advice. It does not diagnose any condition, and the signs described are general rather than a checklist for self-diagnosis. Only a qualified healthcare professional can assess and diagnose an eating disorder. If you are worried about yourself or someone else, please speak with a doctor as soon as you can. If there is any sign of physical danger, or if you or someone else is in crisis or having thoughts of self-harm, contact your local emergency services now. For eating disorder support, contact a helpline such as Beat in the UK (call 0808 801 0677) or a national eating disorders or mental health helpline in your country.