A parent sees their 15-year-old after a few weeks and says she looks great, she must have lost weight. It’s meant as warmth. It arrives as a rule: this version of your body is better than the one you had in March.
Most adults have said some version of that sentence. Almost none of them meant any harm by it. It’s still among the adult habits researchers have linked most consistently to worse outcomes for teenagers, and it’s the easiest one to drop.
Teenagers are not getting their ideas about bodies from nowhere. In its advisory on social media and youth mental health, the US Surgeon General’s office reported that “when asked about the impact of social media on their body image, 46% of adolescents aged 13-17 said social media makes them feel worse,” citing a 2022 survey by the Digital Wellness Lab.
Adults can’t delete that feed. What adults can do is stop being one more voice pushing in the same direction, and that turns out to be a larger lever than it sounds. This article is about what shapes a young person’s body image, what reliably backfires, what helps instead, and when to pick up the phone.
The finding that should reset the conversation
In a 2014 study in the International Journal of Eating Disorders, a team led by Paul Rohde at the Oregon Research Institute followed 496 adolescent girls with eight annual assessments, starting around age 13 and a half. They were looking for which risk factors, measured at which ages, predicted a later eating disorder.
Body dissatisfaction at ages 13, 14, 15 and 16 predicted the onset of a diagnosable eating disorder in the four years after each of those assessments. Body mass index did not predict eating disorder onset at any age.
Read that twice. The feeling predicted the illness. The number on the scale did not.
That single result undercuts the instinct most worried adults have, which is to act on what they can see and measure. Body dissatisfaction is the thing worth paying attention to, and it is invisible unless somebody is listening for it.
What shapes how a teenager sees their body
Several inputs stack, and most of them are not under a parent’s control.
Puberty itself. Body composition changes substantially during adolescence, and those changes are normal and routinely misread by the young person going through them, by their peers, and sometimes by the adults around them. What’s happening physically in these years is covered in our article on physical development.
Peers and sport culture. Teammates, locker rooms, weight classes, uniform fittings, and the running commentary of a friend group all feed in. A sport that comments on bodies as part of its routine is an exposure, not a neutral activity.
Algorithmic feeds and edited images. Most of what a teenager scrolls past has been retouched, filtered or staged, and almost none of it is labeled as such. Social media’s effects on adolescents more broadly, including the evidence on how strong those effects are and how much is still contested, are the subject of a separate article here.
Adults. This is the input most under your control and the one most often overlooked.
Weight-based teasing and stigma. A 2020 review in Current Obesity Reports by Rebecca Puhl and Leah Lessard at the University of Connecticut’s Rudd Center found that young people in larger bodies are frequent targets of weight-based victimization from peers, teachers and parents. The review links those experiences to depressive symptoms, low self-esteem and suicidal thoughts, to worse social and academic outcomes, and to physical consequences including disordered eating and less physical activity. Notice that parents appear on the list of sources.
Four things well-meaning adults do that backfire
Commenting on a young person’s body at all, including the praise
The compliments are the tricky ones, because they don’t feel like criticism. They do the same work. “You look so good, have you lost weight?” teaches a teenager two things at once: that their body is being watched, and that it is being graded.
The numbers here are stark. In a 2013 study in the Journal of Eating Disorders, Katherine Bauer and colleagues surveyed 218 mother and adolescent daughter pairs. Among girls whose parents never commented on their weight, 4.2% reported using any harmful weight-control behavior. Among girls whose parents commented frequently, that figure was 23.2%. More frequent comments were also associated with higher depressive symptoms and more binge eating.
An earlier study of 356 girls at 12 high schools, published in 2010 in the Journal of Adolescent Health, found that 45% said their mothers encouraged them to diet and 58% reported weight-related teasing from family members. The University of Minnesota researchers summarized the result bluntly: “In no instances were family weight talk and dieting variables associated with better outcomes in the girls.”
Not one instance. Not for weight, not for mood, not for eating.
Commenting on your own body in front of them
This is the one adults rarely count as a comment at all. “I shouldn’t have eaten that.” “I need to do something about this stomach.” “I look awful in this.”
The same 2013 study found that mothers who talked more often about their own weight, shape or size had daughters with lower self-worth and more depressive symptoms. A 2016 study in the Journal of Adolescent Health, led by Ann Haynos, followed 243 adolescents who were dieting but had not yet moved into disordered restrictive eating. Maternal dieting and poor family communication were among the factors that predicted long-term risk of escalating.
The mechanism is simple once you see it. A teenager doesn’t hear “I feel bad about my stomach.” They hear the rule the sentence implies, which is that a stomach like that is a problem, and they check their own.
Sorting food into good and bad
Food language carries moral weight that adults stop hearing. Being good today. Earning dessert. Making up for the weekend. Detoxing. Guilt-free.
Each of those sentences tells a teenager that eating is a performance with a score. In its 2016 clinical report in Pediatrics, the American Academy of Pediatrics, through authors Neville Golden, Marcie Schneider and Christine Wood, advised that the focus belongs on healthy habits rather than on weight. Neutral food language is the household version of that advice. How to feed a teenager without the moral overlay is covered in our article on adolescent eating.
Putting a teenager on a diet
This is the most direct of the four, and the evidence against it is the oldest.
The same Academy of Pediatrics report notes that most adolescents who develop an eating disorder did not have obesity beforehand, and that some develop one in the course of trying to lose weight. A 2006 study in the Journal of the American Dietetic Association followed 2,516 Minnesota adolescents for five years and found that those using unhealthy weight-control behaviors at the start were about three times as likely to be in a higher weight category five years later than those using none, with roughly six times the odds of binge eating with loss of control.
This is the honest trade-off, stated with both sides. That same Academy of Pediatrics report also concludes that obesity prevention and treatment, when conducted correctly, do not appear to predispose adolescents to eating disorders. So this is not an argument that a young person’s health is off limits, or that a clinician should never raise it. It’s an argument about who holds the instrument. A diet run by a parent at the dinner table is a different thing from care delivered by someone who knows the whole child, and the research keeps finding that the first one does harm the second one doesn’t.
What helps instead
The replacements are less obvious than the things to stop, so here they are concretely.
Talk about what a body does, not how it looks. “Your legs got you up that hill” is a different sentence from “you look fit.” Function language is available for every body in every condition, and it doesn’t create a standard anyone can fall below.
Make sure there’s enough food, reliably. Restriction at home registers as risk, not as safety. A stocked kitchen and predictable meals do more for body image than any conversation about it.
Stop narrating your own body out loud. Not softening it, not replacing it with something more positive. Stopping. Silence is a legitimate option and it’s the fastest change available.
Protect the dinner table. No commentary on anyone’s plate, from anyone. If a sibling or a visiting relative does it, that’s yours to interrupt, out loud, in the moment.
Name strengths that have nothing to do with appearance, and do it often enough that it isn’t noticeable. What they noticed. What they fixed. Who they stood up for. How they handled something hard.
Say out loud that images are edited. Not as a lecture. As an observation, repeated casually until it’s obvious.
Teaching a teenager to read a feed
Media literacy is the one preventive approach with a real evidence base behind it, and the honest label on that evidence is “modest and mostly school-based.”
A 2020 meta-analysis in Health Communication by Areeg Zuair and Pradeep Sopory pooled 21 intervention and control comparisons from 16 studies of school-based media health literacy programs. The programs produced small improvements in body image concerns and eating concerns, and a larger improvement in internalization of the thin ideal, which is the belief that a particular body type is what a person should be aiming at. The authors flag a real limit: nearly every sample was European, so how well this carries to US teenagers is not established.
A 2021 meta-analysis in the Journal of Prevention, led by Martina Kurz, pooled 17 program evaluations covering 7,392 students in grades five through nine. Positive body image and media literacy both improved more in the intervention groups than in the controls, though the variation between studies was substantial. The programs built around cognitive dissonance, meaning ones that ask participants to argue against the thin ideal themselves rather than be lectured about it, performed best.
A 2024 review in Psychology Research and Behavior Management by Suzanne Mazzeo and colleagues at Virginia Commonwealth University surveyed what makes these programs work and concluded that more research is needed to identify the best approaches. That’s the accurate tier: real signal, incomplete picture.
The home version of all this is smaller than a program. Watch something together and ask one question about how it was made. Who was paid for this. What got cut. What does this account sell.
When to stop watching and make a call
Adolescence produces plenty of food and body weirdness that resolves on its own. What you’re watching for is a pattern, not an incident.
The National Institute of Mental Health’s general threshold for children’s mental health is the most useful one a worried parent can hold: seek an evaluation when something has lasted weeks or longer, is causing distress to the young person or the family, or is getting in the way of school, friendships or home life. You don’t need to be sure. You need a pattern.
Applied here, that pattern tends to look like some combination of the following.
- Eating has stopped being ordinary and become stressful. Rules keep multiplying while the list of acceptable foods keeps shrinking.
- They’ve stopped eating with other people. Meals at home get avoided, lunch gets skipped, and social plans involving food get declined.
- Mood now tracks food and body. Whether it was a good day is decided by what they ate or what the mirror said.
- Exercise has stopped being optional. Missing it causes real distress, and it happens anyway when they’re sick or injured.
- They’ve pulled back from activities, friends or interests they used to care about.
- Physical changes that a clinician should look at: fainting or dizziness, feeling cold all the time, persistent fatigue, or periods that stop or become irregular.
Take any of these to the pediatrician rather than to a search engine. They can examine the young person, order what’s needed, and refer.
They happen in every kind of body, to every kind of teenager
The stereotype is a thin, white, affluent teenage girl. That image delays diagnosis for everyone it doesn’t match, which is most people.
The National Institute of Mental Health reports that 2.7% of US adolescents aged 13 to 18 had an eating disorder at some point in their lives, 3.8% of girls and 1.5% of boys, based on the National Comorbidity Survey Adolescent Supplement fielded between 2001 and 2004. Treat that figure as a floor rather than a current count: the data are more than two decades old and covered only three diagnoses.
Boys and young men are in that number. So are transgender and nonbinary teenagers, at higher rates. A 2020 review in Current Opinion in Psychiatry by Jason Nagata at the University of California San Francisco, Kyle Ganson and S. Bryn Austin reported US lifetime eating disorder prevalence, based on self-reported diagnosis by a health care provider, of 10.5% among transgender men and 8.1% among transgender women, with sexual minority adults also reporting higher lifetime rates than cisgender heterosexual adults.
Body size is not a screening tool either. A 2017 review in Current Problems in Pediatric and Adolescent Health Care by Lindsay Moskowitz and Eric Weiselberg describes atypical anorexia nervosa, in which the illness is present without the low body weight the stereotype expects, and notes it can produce significant illness and death. The same review reports that anorexia nervosa has the highest mortality rate of any psychiatric illness.
A teenager who doesn’t look the part waits longer for help. That delay is the thing the stereotype costs.
The numbers to keep
Eating disorders are treatable. The National Institute of Mental Health states plainly that they can be treated successfully and that early detection and treatment matter for a full recovery. That’s the reason to call before you’re certain rather than after.
The National Alliance for Eating Disorders helpline: 1-866-662-1235. It’s free, it runs 9 a.m. to 7 p.m. Eastern time Monday through Friday, and it’s answered by licensed therapists who specialize in eating disorders. The Alliance also runs free weekly therapist-led support groups and a national referral database at findEDhelp.com. The organization states that eating disorders affect people of all ages, backgrounds and body sizes, and that there is no particular look.
The 988 Suicide and Crisis Lifeline: call or text 988, or chat at 988lifeline.org. Call 911 if someone’s life is in immediate danger. The National Institute of Mental Health lists 988 on its own eating disorders page for a reason: these illnesses carry elevated risk of co-occurring depression, anxiety and substance use.
For treatment near you, the Substance Abuse and Mental Health Services Administration runs a locator at findtreatment.gov. And your pediatrician is a legitimate first call, not a lesser one.
Four sentences to retire
A practical swap list, for the moments these come up:
- “You look great, have you lost weight?” Try: “It’s good to see you. How was your week?”
- “I shouldn’t have eaten that.” Try: nothing. Say nothing about your own body where they can hear it.
- “Are you sure you want seconds?” Try: pass the dish.
- “You’d feel better about yourself if you just…” Try: “What would help right now?”
None of these are about finding kinder words for the same message. The message is the problem.
The highest-return change
If you do one thing after reading this, make it the second item on that list.
Stop narrating bodies out loud, including your own, in front of the young people in your house. It costs nothing, it requires no conversation, no buy-in and no announcement, and it removes one of the few inputs on the whole list that you fully control. The research on parent weight talk is unusually one-directional: across the outcomes measured, it has not been found to help.
Then watch for the pattern, not the size. And if you’re reading this because you’re already worried about someone, the number is 1-866-662-1235, and the pediatrician’s office opens in the morning.
Sources
- U.S. Department of Health and Human Services, Office of the Surgeon General. “Social Media and Youth Mental Health: The U.S. Surgeon General's Advisory.” hhs.gov
- National Institute of Mental Health. “Eating Disorders (statistics).” nimh.nih.gov
- National Institute of Mental Health. “Eating Disorders.” nimh.nih.gov
- National Institute of Mental Health. “Children and Mental Health: Is This Just a Stage? (NIH Publication No. 24-MH-8085).” nimh.nih.gov
- National Alliance for Eating Disorders. “National Alliance for Eating Disorders (helpline, support groups and referral database).” allianceforeatingdisorders.com
- Golden NH, Schneider M, Wood C (American Academy of Pediatrics). “Preventing Obesity and Eating Disorders in Adolescents. Pediatrics, 2016. PubMed. DOI: 10.1542/peds.2016-1649.” doi.org
- Rohde P, Stice E, Marti CN. “Development and predictive effects of eating disorder risk factors during adolescence: Implications for prevention efforts. International Journal of Eating Disorders, 2014. PubMed. DOI: 10.1002/eat.22270.” doi.org
- Neumark-Sztainer D et al.. “Family weight talk and dieting: how much do they matter for body dissatisfaction and disordered eating behaviors in adolescent girls? Journal of Adolescent Health, 2010. PubMed. DOI: 10.1016/j.jadohealth.2010.02.001.” doi.org
- Bauer KW, Bucchianeri MM, Neumark-Sztainer D. “Mother-reported parental weight talk and adolescent girls' emotional health, weight control attempts, and disordered eating behaviors. Journal of Eating Disorders, 2013. PubMed. DOI: 10.1186/2050-2974-1-45.” doi.org
- Haynos AF et al.. “Factors Predicting an Escalation of Restrictive Eating During Adolescence. Journal of Adolescent Health, 2016. PubMed. DOI: 10.1016/j.jadohealth.2016.03.011.” doi.org
- Puhl RM, Lessard LM. “Weight Stigma in Youth: Prevalence, Consequences, and Considerations for Clinical Practice. Current Obesity Reports, 2020. PubMed. DOI: 10.1007/s13679-020-00408-8.” doi.org
- Nagata JM, Ganson KT, Austin SB. “Emerging trends in eating disorders among sexual and gender minorities. Current Opinion in Psychiatry, 2020. PubMed. DOI: 10.1097/YCO.0000000000000645.” doi.org
- Moskowitz L, Weiselberg E. “Anorexia Nervosa/Atypical Anorexia Nervosa. Current Problems in Pediatric and Adolescent Health Care, 2017. PubMed. DOI: 10.1016/j.cppeds.2017.02.003.” doi.org
- Zuair AA, Sopory P. “Effects of Media Health Literacy School-Based Interventions on Adolescents' Body Image Concerns, Eating Concerns, and Thin-Internalization Attitudes: A Systematic Review and Meta-Analysis. Health Communication, 2020. PubMed. DOI: 10.1080/10410236.2020.1813954.” doi.org
- Kurz M et al.. “School-Based Interventions Improve Body Image and Media Literacy in Youth: A Systematic Review and Meta-Analysis. Journal of Prevention, 2021. PubMed. DOI: 10.1007/s10935-021-00660-1.” doi.org
- Mazzeo SE et al.. “Mitigating Harms of Social Media for Adolescent Body Image and Eating Disorders: A Review. Psychology Research and Behavior Management, 2024. PubMed. DOI: 10.2147/PRBM.S410600.” doi.org
- Neumark-Sztainer D et al.. “Obesity, disordered eating, and eating disorders in a longitudinal study of adolescents: how do dieters fare 5 years later? Journal of the American Dietetic Association, 2006. PubMed. DOI: 10.1016/j.jada.2006.01.003.” doi.org
- Substance Abuse and Mental Health Services Administration. “FindTreatment.gov.” findtreatment.gov