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Does My Teenager Have an Eating Disorder, or Is It Just a Phase?

Writer: Susan McClanahan, Ph.D. & Angela Derrick, Ph.D.
Susan McClanahan, Ph.D. & Angela Derrick, Ph.D.
5 hours ago
8 min read
A family portrait with teenage daughters, all smiling and holding hands.

If you are beginning to notice changes in your teenager's eating patterns, you might be asking yourself, "Should I be worried?" Maybe your daughter has announced she is going vegetarian. Or your son is suddenly ravenous, clearing the pantry after practice. Maybe your teen has become picky about what they will and will not eat, or they have started working out every day and obsessing over carbs or protein. You might be wondering if all of this is ultimately ordinary; after all, adolescence reshapes how kids eat. Even so, you worry, "Could this be an early sign of disordered eating?"


The hard part is that the two can resemble each other from the outside, which is exactly why eating disorders in teenagers are so easy to miss, and likewise so easy to explain away. A parent's instinct to think "it's probably just a phase" is right much of the time. The concern is the handful of times it isn't.


This piece will help you tell the difference: what normal teenage eating actually looks like, where it crosses into disordered eating, and what to do if your gut is telling you something is off.


What Eating Patterns are Normal for a Teenager?


Normal adolescent eating is flexible and mostly untroubled. Teenagers grow fast, so their appetite can be enormous and vary from day to day. They might go through food phases and can develop strong opinions around eating. For instance, they may love something for a month and then abandon it completely, try on vegetarianism or a new way of eating they've read about, and eat differently with friends than they do at home.


A certain amount of self-consciousness about appearance is also typical in these years. Most teenagers have moments when they dislike something about their looks. What makes all of this ordinary is that it comes and goes, doesn't take over their life, and doesn't cause real or prolonged distress. They can skip the workout, eat the birthday cake, change their mind about the diet they started, and move on.


In other words, normal teenage eating is naturally adaptable. Concern is warranted when their eating behaviors become more inflexible.



When Does Normal Teen Eating Become Disordered?


Eating passes from normal to disordered when natural and flexible attitudes turn into rigid and controlling ones characterized by secrecy and distress. It is less about any single food habit and more about the grip of the behavior, whether your teen is running their eating or their eating is running them.


A few dividing lines tend to separate a phase from a problem:


  • Rigidity. Rules, rituals, and fear replace preference. The list of "safe" foods shrinks, flexibility becomes impossible, and a disrupted routine causes real anxiety rather than an easy shrug.

  • Distress. Food and body become a source of guilt, shame, or dread, not just passing self-consciousness.

  • Preoccupation. Thoughts about eating, weight, or exercise start crowding out healthy pursuits such as spending time with friends, excelling in school, taking part in personal interests, the very things that used to inspire them.

  • Secrecy. Eating happens alone, or is hidden, minimized, or lied about. "I already ate" might become a common refrain.

  • Impairment. Your teen's behavior around food starts to take a toll, pulling them out of meals, social life, and the developmentally normal business of being a teenager.


One of these items on its own may mean little. Several together, or any one intensifying over time, is a reason to pay closer attention.


Normal Teen Eating vs. Eating Disorder Warning Signs



Usually Part of Normal Adolescent Eating

Signs of an Eating Disorder

Appetite

Eats a lot, especially in growth spurts; appetite varies day to day

Regularly skips meals, eats very little, or insists they "already ate"

Food Choices

Goes through phases, tries vegetarianism, has foods they love and reject

Cuts out whole food groups, follows strict rules, and the menu keeps shrinking

Dieting

Curious about nutrition; a passing interest in eating well

Actively dieting to lose weight, counting calories, measuring, or tracking food

Exercise

Enjoys sports and movement; can miss a day without it being a big deal

Exercises compulsively, with guilt or anxiety when they can't, or to "make up for" eating

Eating With Others

Eats with family and friends, enjoys food socially

Avoids eating in front of people, pulls away from meals and food-centered events

Feelings About Body

Some self-consciousness that comes and goes

Preoccupied with weight or shape; frequent weighing or mirror-checking; mood depends on the number


You may also notice physical changes and complaints such as feeling cold or tired, dizziness, stomach problems, hair and skin abnormalities, and irregular or absent periods. These are reasons to check in with a doctor and an eating disorder specialist. By the time these symptoms appear, the behavior has often been underway for a while.


Is Dieting a Red Flag in a Teenager?


Often, yes, because dieting is one of the strongest predictors for developing an eating disorder. In a well-known Australian study that followed nearly 2,000 adolescents for three years, those whose dieting was severe were eighteen times more likely to develop an eating disorder than those who did not diet, and even moderate dieters had about a fivefold higher risk.


We are not saying that every teenager who wants to eat healthily is at risk. But we also want to emphasize that dieting to lose weight is not the harmless, health-conscious habit it can seem at this age. For a young person whose body is still growing, there is rarely a medical reason to diet at all, and dieting is often where an eating disorder begins. So when a teenager starts one, it is a good moment to explore what is driving it.


Does an Adolescent Have to Be Underweight to Have an Eating Disorder?


No. And this is one of the most common and costly misunderstandings for parents. You cannot tell whether a young person has an eating disorder just by looking at them. The current diagnostic criteria no longer require someone to be severely underweight. By one estimate from the National Association of Anorexia Nervosa and Associated Disorders, only about 6 percent of people with eating disorders are medically underweight.


A teenager can be at an average or higher weight, or can even be praised for "eating so healthy" and "having so much discipline," all the while a serious restrictive disorder may be taking root underneath. If you have been reassuring yourself that your child can't have an eating disorder because they don't look the part, that reassurance is not reliable. We write more about this trap in our piece on what to do when an already-thin daughter wants Ozempic.


Can Adolescent Boys Have Eating Disorders?


Eating disorders in boys are common, serious, and critically underdiagnosed. Reasons include that the signs can present differently in boys and that too few people pay attention to this possibility. The American Academy of Pediatrics notes a real delay in identifying boys and young men with eating disorders, driven by the old assumption that this is a "girl problem."


In boys, the focus is often on leanness and muscularity rather than thinness. Instead of cutting calories to get smaller, a boy may eat in rigid "clean" ways to get lean, train compulsively, and use protein powders or muscle-building supplements. Because that can pass for dedication and healthy ambition, people tend to applaud it rather than question it. If your son's eating and exercise have become rigid, guilt-driven, and all-consuming, he deserves the same attention you would give to a daughter.


What Can Parents Do if They Suspect Disordered Eating in Their Teen?


If your instinct is telling you something is wrong, the most useful first step is to get curious rather than alarmed, and to resist making it about the food or the weight. Here is what tends to help.


  • Don't comment on weight, bodies, or "good" and "bad" foods, your teenager's or anyone else's. Even remarks that are well-meaning can cause harm.

  • Look at the whole picture, not one meal. A single skipped dinner means little. An intensifying pattern across weeks means more.

  • Open the conversation gently. Lead with what you have noticed and curiosity about how your teen is feeling, not with food. "You've seemed stressed, and I've noticed you've been skipping meals; how are you doing?" opens more than "You need to eat."

  • Look honestly at the messages at home. Diet talk, body criticism, and "earning" food are absorbed more than we realize. A parent's own steadiness about their body is one of the most protective things a teenager can witness. We cover this more in our piece on what families need to know when a parent is on a GLP-1.

  • Don't wait for a crisis, and don't wait for proof. You do not need to be certain to ask for help. Uncertainty is reason enough to talk to someone who understands eating disorders.


When Should You Get Help for a Teen's Eating?


The earlier an eating disorder is caught, the better the chance of a full recovery. The American Academy of Pediatrics is direct about this: earlier identification is linked to better outcomes for young people. Eating disorders are serious illnesses, but they are also treatable, with adolescence being the most hopeful time to treat one.


That's why the normal-versus-disordered eating question matters. Not to make you anxious about every food phase, most of them are exactly what they look like, but so that the few times it is something more, you catch it while it is still small.


Dr. Angela Derrick notes, “Many of my adult clients in mid-life tell me that they wish they had been offered the treatment and recovery resources in adolescence, when their eating disorders developed. However, it can be really challenging for parents to know how to intervene, as these conversations are tricky and they fear alienating their child. I have been recommending the newly published book, “End the Food Fight: Replacing Control with Connection and Help Your Child Heal from an Eating Disorder” by Tom Wooldridge, PsyD. as a tool for parents who are making efforts to address their concerns about their child’s eating habits. I appreciate the emphasis on maintaining the relationship between the parent and child and looking for opportunities for connection rather than control.”

How SpringSource Can Help


At SpringSource: Eating, Weight & Mood Disorders, we help families with exactly this uncertainty, the "is this normal or is this something" question. Our approach is weight-inclusive and non-shaming, toward your teenager and toward you. We don't treat a worried parent as a problem, and we don't treat a teenager's eating as a character flaw. We treat it as what it usually is: a signal that deserves a careful, caring look.


If something in this piece sounds like your family, we would be glad to help you think it through. We offer a free 15-minute consultation. Call us at 224-202-6260, fill out our contact form, or schedule online.


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