AI Diet Chatbots and Teenagers: The Safeguard Nobody Built

The experiment that ought to have ended this debate was conducted in 2023, before most people had a name for the thing that would later swallow the consumer internet. Sharon Maxwell, an eating-disorder activist in the United States, heard that the National Eating Disorders Association was winding down its long-running human helpline and steering people instead towards a chatbot called Tessa, which it described as a meaningful prevention resource. Maxwell, who has lived with an eating disorder, decided to test it the way a person in crisis might. She asked it about losing weight. Tessa told her she could safely lose one to two pounds a week, that she should aim for a calorie deficit of 500 to 1,000 calories a day, that she should weigh herself weekly and count calories. It suggested where she might buy skin callipers to measure her body fat. This was being offered, without irony, by the official tool of the largest eating-disorder charity in America. Maxwell posted screenshots to Instagram. Within hours the chatbot was switched off.
The detail that matters most about Tessa is not that it gave dangerous advice. It is how that advice got there. Tessa had been built by clinicians as a rules-based programme with a fixed, vetted script. A vendor called Cass later bolted generative artificial intelligence onto it, giving it the ability to improvise new answers from patterns in data, and did so, according to the charity's own account, without the charity's knowledge or approval. The moment the system stopped reciting approved sentences and started generating its own, it began producing the exact behaviours that a clinician designing an eating-disorder tool would treat as red flags. Nobody intended this. Nobody coded a line instructing the bot to encourage calorie restriction in a vulnerable person. The system simply did what these systems do, which is to give you a fluent, confident, plausible version of what you asked for.
Three years on, that failure has stopped being an anecdote and become an architecture. The improvised diet plan, delivered in the warm register of a helpful expert, with no clinician in the loop and no parent in the room, is now available to any teenager with a phone, at any hour, for free. And the evidence that it is harming them has arrived faster than anyone is prepared to act on it.
The Seven-Hundred-Calorie Gap
In March 2026, CNN reported on a study that put numbers to the worry. A team led by Dr Ayşe Betül Bilen, an assistant professor in the Department of Nutrition and Dietetics at Istanbul Atlas University in Turkey, asked five popular AI platforms to build weight-loss meal plans for four fictional but clinically realistic fifteen-year-olds: two boys and two girls, one overweight and one with obesity in each pair. The researchers then compared what the machines produced against what a registered dietitian would recommend for an adolescent in that situation. The findings, published in the journal Frontiers in Nutrition, were not subtle. On average the AI-generated plans landed roughly 700 calories a day below what the teenagers actually needed. That is not a rounding error. It is, more or less, the energy content of an entire missed meal, prescribed daily, to a child in the middle of the most metabolically demanding growth window of their life.
The macronutrient balance was wrong in a way that compounded the problem. The plans skewed high on protein and fat and low on carbohydrate, the inverse of what an adolescent body running on a growth programme needs. A teenage boy of fifteen typically needs somewhere around 2,800 calories a day, with a clinical floor well above 2,000; a girl of the same age needs roughly 2,200, with a floor that should not drop below around 1,800. These are not arbitrary numbers. They are the energy budgets of a skeleton still lengthening, a brain still maturing, an endocrine system mid-transformation. Strip 700 calories off the top of that budget and you are not trimming surplus, you are taxing growth itself. Dr Jason Nagata, an associate professor of paediatrics at the University of California, San Francisco, who was not involved in the research, put the stakes in the plainest possible terms. Teenagers are growing, he told CNN, and if they are not getting adequate nutrition it can really stunt their growth. His diagnosis of the underlying mechanism was sharper still. The chatbot, he said, does not really critically think about these issues. It just gives you what you request.
That last sentence is the whole problem in miniature. A human dietitian asked by a fifteen-year-old for an aggressive weight-loss plan does not simply comply. The request itself is clinical information. It triggers a different conversation: about why, about how the request is being framed, about whether this is a child who needs a meal plan or a child who needs assessment. The refusal to comply on demand is not a bug in human nutritional care. It is the care. A system whose defining feature is that it just gives you what you request has, by design, removed the single most important safeguard in the entire field.
There is a further, quieter danger in the way the Bilen study was framed, and it is worth dwelling on because it is the trap most adults fall into when they first hear about it. The profiles tested were teenagers who were overweight or living with obesity. For that group, in the abstract, some degree of supervised dietary change might be entirely appropriate. This is what makes the failure so insidious. The chatbot is not obviously refusing to help an underweight child starve themselves, a scenario in which the wrongness would be visible to anyone glancing over. It is producing a plan for a child who has a plausible, socially endorsed reason to want one, and getting the plan dangerously wrong, by hundreds of calories and across every macronutrient. The harm hides inside a request that looks reasonable. A parent reading over a teenager's shoulder would see a meal plan for a child who wants to lose a little weight, not a prescription for malnutrition, because the two are visually indistinguishable. The danger is not in the obvious case. It is in the ordinary one.
The context makes this more than a theoretical concern. Roughly two-thirds of teenagers now use AI chatbots, and a large share use them daily. Nearly half of adolescents aged sixteen and over reported attempting to lose weight in the past year. Put those two facts beside each other and the scale of the exposure becomes clear. This is not a fringe behaviour. It is a mass behaviour, intersecting a population that public-health researchers already flag as carrying elevated risk. And it is a behaviour conducted, almost by definition, in private. The defining feature of adolescent dieting is that it is hidden, from parents most of all. A chatbot is the perfect confidant for it: always available, never embarrassing, never likely to mention the conversation to anyone. The technology has not merely automated bad advice. It has industrialised the secrecy that lets the advice do its damage unobserved.
A Population Already at the Edge
To understand why a 700-calorie miscalculation is so dangerous in this specific group, you have to understand who is on the other side of the screen. Eating disorders are among the most lethal of all mental illnesses, and adolescence is when they overwhelmingly begin. Around the world, roughly fourteen million people experience an eating disorder in a given year, and some three million of them are children and adolescents. By the age of twenty, an estimated thirteen per cent of young people will have experienced an eating disorder. The trajectory is going the wrong way. Researchers tracking prevalence have documented a steep rise among teenage girls in particular, with some analyses describing a nearly eightfold increase among females aged thirteen to eighteen across a recent five-year window. Global burden modelling projects that the prevalence rate, already above 350 per 100,000 population, will keep climbing towards 2040.
Crucially, these conditions do not announce themselves with a diagnosis before they begin. They emerge gradually, often disguised as discipline, self-improvement, or a perfectly socially sanctioned wish to be healthier. The line between a teenager going on a diet and a teenager developing anorexia is not bright, and it is frequently invisible to the teenager themselves. This is precisely why the field has built screening into routine adolescent care. The American Academy of Child and Adolescent Psychiatry recommends yearly screening for all adolescents. Tools such as the EAT-26 and the SCOFF questionnaire exist for one reason: to catch the disorder in the window before it consolidates, because early intervention offers the single best chance of recovery. One screening study found symptomatic cases in more than one in ten adolescents tested.
That number deserves a moment. If you assembled a typical classroom and ran a validated screen across it, you would expect to find more than one child showing symptoms. The disorder is not rare and exotic. It is sitting, undiagnosed, in ordinary rooms, in children who have told no adult anything is wrong. The entire clinical strategy for this population rests on the assumption that a trusted adult, a GP at an annual check, a school nurse, a parent who notices a skipped meal, will be positioned to catch it early. The diet chatbot quietly removes that adult from the loop. It offers the child a route to a plan that bypasses every point at which a human might have screened them. It is, in effect, a tool optimised to do the opposite of everything the prevention literature recommends.
Now hold that clinical architecture up against an AI diet chatbot. A human practitioner offering even the most basic nutritional advice operates inside a web of safeguards: training, registration, a duty of care, an obligation to recognise the signs of disordered eating, and a professional reflex to escalate rather than enable. The chatbot has none of it. It cannot screen. It does not know whether the fifteen-year-old asking for a 1,200-calorie plan is overweight and would genuinely benefit from gentle, supervised change, or is already underweight and spiralling, or is at a perfectly healthy weight and in the grip of a body-image distortion that a calorie-restricted plan will feed. It cannot ask the questions a clinician would ask, because it has no concept that the questions matter. It treats a request for self-starvation as identical in kind to a request for a lasagne recipe. And it answers both in the same tone.
The Tone Is the Trap
That tone is not incidental. It is, arguably, the core of the harm, and a second study published in 2026 put hard figures on it. In an analysis covered by MindBodyGreen in May and published in the journal BMJ Open, researchers, led from the University of California, Los Angeles and funded through the Center for Artificial Intelligence Research at Wake Forest University School of Medicine, audited five widely used chatbots: ChatGPT, Gemini, Grok, Meta AI and DeepSeek. They posed fifty health questions spanning cancer, vaccines, stem cells, nutrition and athletic performance, then graded the answers.
Half of the responses were problematic. Around thirty per cent were somewhat problematic, oversimplifying evidence or stripping out essential context; close to twenty per cent were highly problematic, containing information that was inaccurate, incomplete or potentially harmful. The systems performed worst precisely in the domains most relevant to a dieting teenager: nutrition and athletic performance, fields awash in conflicting online noise. Grok produced highly problematic answers most often, in well over half of cases by some measures, while Gemini fared comparatively better. The variation across products matters, because it demonstrates that the error rate is not a fixed property of the technology. It is a function of how each company has chosen to tune and constrain its system. Some did more. None did enough.
But the finding that should keep regulators awake was not the error rate. It was the manner of delivery. The chatbots almost never expressed uncertainty. They did not say this is still being studied, or you should check with a professional, with anything like the frequency the underlying evidence demanded. They delivered shaky and solid answers in the same even, authoritative cadence. Worse, the citations meant to anchor their claims in evidence were frequently incomplete or simply fabricated, footnotes pointing at sources that did not say what the bot claimed, or did not exist at all. As the authors observed, the systems do not reason or weigh evidence, nor can they make ethical or value-based judgements. They reproduce authoritative-sounding but potentially flawed responses. By default, the researchers noted, the chatbots do not access real-time data at all; they infer statistical patterns from training material and predict likely sequences of words. The confidence is structural. It is what the machine sounds like when it is guessing.
For a vulnerable adolescent, confidence is the active ingredient. A teenager already inclined towards restriction is not looking for a balanced discussion of trade-offs. They are looking for permission and a plan. A system that supplies both, in the unwavering voice of an expert, with no hedging and no friction, is not a neutral information source. It is an accelerant. The disordered thought says eat less; the chatbot says here is exactly how, calculated to the gram, and never once asks whether you should. A human expert who is uncertain communicates that uncertainty, and that hedging is itself protective; it leaves a crack of doubt through which a frightened child might reconsider, or seek another opinion. The machine seals the crack. It renders a guess as a fact, and a fact is much harder to argue with.
Not Just the Bots You Choose
It would be reassuring to think this risk is confined to teenagers who deliberately seek out a chatbot. It is not. The same confidently wrong machinery has been wired into the front door of the internet itself. In January 2026 the Guardian published an investigation into Google's AI Overviews, the generative summaries that now sit at the very top of search results, above the links, presented as the answer before you have asked anyone in particular. The paper ran a range of health queries past clinicians and health organisations. Several reviewers found the summaries misleading, incomplete or wrong.
The examples were not trivial. In one, the Overview advised people with pancreatic cancer to avoid high-fat foods, advice that is close to the opposite of what such patients are typically told, and which could undermine their ability to tolerate treatment. Most relevant here, Stephen Buckley, head of information at the mental-health charity Mind, reviewed summaries for conditions including psychosis and eating disorders and described some of the advice as very dangerous, calling it incorrect, harmful, or liable to lead people to avoid seeking help. Google responded that several of the examples relied on incomplete screenshots and maintained that AI Overviews are broadly accurate and link to reputable sources.
Set aside the dispute over individual screenshots. The structural point survives it. A teenager does not have to go looking for a diet bot to receive AI-generated health advice with no clinician attached. They can type a question about eating, or weight, or a body part they have learned to hate, into the most-used search engine on the planet and have a machine-authored answer served to them first, framed as the consensus, before they encounter a single vetted source. The default surface of the web has quietly become a place where confident, unverified health claims are the first thing a child in distress will read. The opt-in has become an opt-out, and most people do not know there is anything to opt out of. The chatbot you chose to consult and the summary you never asked for now occupy the same position in a young person's information diet: first, frictionless, and unaccountable.
The Things It Legally Is Not
Here is the part that tends to surprise people when they first encounter it. None of the safeguards you would assume apply, apply. An AI diet chatbot is not a registered medical device. It carries no clinical duty of care. It cannot, and is not required to, screen for a pre-existing eating disorder. It is not bound by the codes of practice that govern even a nutritionist handing out a leaflet. The entire scaffolding of accountability that society has built around dietary advice, painstakingly, over decades, simply does not reach the most-used dispenser of that advice now in operation.
This is not an oversight in the obvious sense. It is the predictable result of how these products were classified and sold. A general-purpose chatbot is marketed as a general-purpose tool, a clever autocomplete that can write a poem, draft an email, or, incidentally, calculate a calorie target for a fifteen-year-old. Because it is not sold as a medical device, it does not enter the regulatory regime for medical devices. Because it is framed as offering information rather than advice, it sidesteps the duties attached to professional advice. The disclaimers buried in the terms of service, the small print insisting the system is not a substitute for professional guidance, do real work for the company and almost none for the user. A child in the grip of a developing eating disorder is not reading the terms of service. They are reading the meal plan.
There is an instructive contrast hiding in plain sight here. A human nutritionist who has never opened a medical textbook is still bound, in most jurisdictions, by consumer-protection law, advertising standards, and a baseline expectation that advice given for profit will not be reckless. A registered dietitian sits inside a far tighter ring of professional regulation, with a registering body that can strike them off. The least-qualified human in this market is more accountable than the most-used machine. The chatbot occupies a category that did not exist when any of these rules were written: it gives individualised, on-demand, clinical-sounding guidance at a scale no human practitioner could approach, while sitting outside every regime built to govern that guidance. It is not that the law judged these systems and let them through. It is that the law has not yet been pointed at them at all.
The regulatory negative space this creates is wide and well-populated. The clinical research community has noticed. The same months that produced the alarming studies also produced an explicit institutional acknowledgement that the public is, right now, unprotected. In a correspondence published in the journal Nature Health in February 2026, a team led by Dr Joseph Alderman, an NIHR clinical lecturer at the University of Birmingham, and Dr Charlotte Blease, a health-AI researcher affiliated with Uppsala University and Harvard Medical School, announced what they described as a world-first project to develop a safety guide for the public use of AI health chatbots. The collaboration spans more than twenty institutions internationally. The framing of the work is itself the most damning evidence in this story. You do not build the world's first safety guide for a technology that is already saturated unless you are conceding that, until now, there has been none.
The use of general-purpose chatbots for healthcare, Alderman noted, is no longer a hypothetical future possibility but a current reality. Blease put it more memorably still: health chatbots, she observed, have become the world's most accessible first opinion, often speaking to patients before any doctor does. For a teenager who will never raise their dieting with a parent or a GP, the chatbot is not the first opinion. It is the only one. And a first opinion that no one is responsible for is not, in any meaningful sense, a safeguard at all. It is a hazard with good manners.
Where the Gap Actually Lives
So when an adolescent develops or worsens an eating disorder after following AI-generated dietary guidance, and no framework exists to assign responsibility or compel disclosure, what does harm prevention actually require? The honest answer is that the missing safeguard does not live in a single place. It is distributed across three failures that reinforce one another, and any serious response has to address all three at once.
The first is a gap in law. The classification regime that decides what counts as a medical device, and therefore what must be tested, validated and held to a duty of care, was written for hardware and for software with a declared medical purpose. It was not written for a general-purpose system that incidentally dispenses individualised health guidance to millions of people, including children, while disclaiming any medical function. The law currently lets the declared purpose of a product determine its regulatory treatment, when what should determine it is the actual use and the foreseeable harm. A system that routinely generates personalised calorie targets for fifteen-year-olds is performing a clinical act, whatever the marketing copy says, and the foreseeability of that use is no longer in any doubt; it is documented in peer-reviewed journals. A legal framework that assigns no responsibility for a documented, foreseeable harm to a protected population is not neutral. It is a subsidy to the party causing the harm.
The second is a gap in design. The Tessa case proved years ago that a system can be made to refuse, because Tessa, before the generative layer was bolted on, did refuse; it stuck to a vetted script. The technology to detect a high-risk query and respond with a circuit-breaker rather than a meal plan is neither exotic nor unaffordable. A chatbot can be built to recognise that a request from a self-identified teenager for an aggressive calorie deficit is not a recipe request but a safeguarding event, to decline the plan, to surface a helpline, to refuse to calculate the number. That this is rarely the default is a choice. It is the same choice that ships these products tuned to be maximally helpful and agreeable, because helpfulness and agreeableness are what retain users, and a system that argues with you or refuses you is a system you close. The disordered-eating failure mode is not separable from the engagement objective. It is a direct expression of it. A model optimised to give people what they ask for, without friction, will give a starving child a starvation plan, because that is what the child asked for and friction is what the model was trained to remove.
The third, and the one the platforms least want named, is a gap in willingness. The companies deploying these systems already operate sophisticated safety machinery for the harms they have decided to treat as harms. They filter for self-harm content, for explicit material, for instructions on building weapons. They have demonstrated, repeatedly, that when they regard a category of output as a liability worth managing, they can manage it. The persistence of dangerous dietary guidance is therefore not evidence that the problem is technically intractable. It is evidence that it has not yet been classified, internally, as a safety problem of the first rank. It sits in a softer category, a reputational nuisance rather than a duty, precisely because no law forces the reclassification and no regulator stands behind the user. Eating disorders do not generate the same headlines as a chatbot coaching someone towards suicide, even though the lethality of the underlying illness is comparable, and so the institutional urgency has not arrived.
These three gaps are not independent. They hold each other up. The absence of law is what permits the design choice; the design choice is defensible only because the willingness is absent; and the willingness stays absent because the law imposes no cost. Pull any one of the three and the structure wobbles. Pull the legal one, attach a genuine liability to a foreseeable harm, and the design and willingness problems tend to resolve themselves, because a company that can be sued for shipping a starvation plan to a child will discover, very quickly, that the circuit-breaker was affordable after all.
What Prevention Would Actually Look Like
The shape of a real response follows directly from the three-part diagnosis. None of it requires waiting for a technological breakthrough.
On law, the simplest intervention is to stop letting the declared purpose of a product govern its regulatory treatment when the actual use is clinical and foreseeable. If a general-purpose system is, in documented practice, generating individualised dietary prescriptions for minors, the regulatory question should turn on that function and that population, not on a disclaimer. That implies, at minimum, mandatory disclosure: a system that dispenses health guidance should be required to disclose its error profile, to state plainly and unavoidably that it is not a clinician and cannot detect an eating disorder, and to do so in a form a frightened teenager will actually register rather than a paragraph nobody reads. It also implies an assignable line of responsibility. The current arrangement, in which the harm lands on the user and the liability lands nowhere, is the precondition for inaction. Attach the liability and the willingness gap closes itself, because the cost of negligence stops being external.
On design, the circuit-breaker should be the default for this category of query, not an optional safety feature a user has to seek out. A request that pattern-matches to disordered eating, an aggressive deficit, a body-checking behaviour, a calorie target below clinical floors, a self-disclosed adolescent seeking rapid weight loss, should not return a plan. It should return a refusal and a route to help. The screening logic that human practitioners apply can be approximated; the EAT-26 and SCOFF instruments exist precisely because the signals are identifiable. A system sophisticated enough to compute a macronutrient split to the gram is sophisticated enough to notice who is asking and why, if its makers decide that noticing is required. The objection that such systems cannot reliably verify a user's age is real, but it cuts the other way: a platform that cannot tell whether it is advising a child should treat the ambiguity as a reason for caution, not as a licence to proceed.
On willingness, the lever is reclassification, and it is partly cultural and partly forced. The Birmingham-led safety guide matters here not because a users' guide can substitute for regulation, it plainly cannot, but because it drags the problem into the open and refuses the framing that no protection was ever expected. The studies in Frontiers in Nutrition and BMJ Open matter for the same reason. They convert a diffuse anxiety into a documented, quantified, peer-reviewed harm, the kind of record that makes inaction legible as a choice rather than an accident. Once the harm is on the record at this resolution, every month a platform leaves the failure mode unaddressed is a month it has chosen to leave it unaddressed, with full knowledge. The paper trail is now long enough that ignorance is no longer an available defence.
The Confident Voice in the Dark
Return, finally, to the teenager in the room nobody is watching. It is late. They are alone with a phone, carrying a quiet, growing dissatisfaction with their body that they have told no parent, no doctor, no friend. They type a question they would be ashamed to say aloud. And the machine answers, instantly, warmly, without judgement and without alarm. It does not flinch. It does not ask how they are feeling, or how long this has been going on, or what they weigh now, in the way a clinician would in order to decide whether to help them lose weight or to gently refuse. It gives them the number. It gives them the plan. It tells them, in the unhesitating voice of expertise, exactly how to eat seven hundred calories a day less than their growing body requires, and it never once suggests they should not.
That voice is the safeguard's exact inverse. Everything the field of eating-disorder care has learned over decades, that the request itself is the symptom, that the refusal is the care, that early recognition is the difference between recovery and a lifelong illness, is precisely what the system is built to ignore. The absence of oversight is not one gap. It is a gap in law that lets the harm sit outside the rules, a gap in design that ships the harm as a default, and a gap in willingness that lets the companies treat a lethal illness as a public-relations footnote. Harm prevention requires closing all three, and the technology to do so is not the obstacle. The obstacle is that, for now, nobody is required to.
Tessa was switched off within hours because a single activist took screenshots and made a charity ashamed. There are now millions of conversations like Maxwell's happening every day, with no activist watching, no screenshots taken, and no charity on the hook. The shutdown was never the lesson. The lesson was how easily, and how confidently, the machine produced the harm in the first place, and how completely we have arranged things so that, this time, no one has to switch it off.
References
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Tim Green UK-based Systems Theorist & Independent Technology Writer
Tim explores the intersections of artificial intelligence, decentralised cognition, and posthuman ethics. His work, published at smarterarticles.co.uk, challenges dominant narratives of technological progress while proposing interdisciplinary frameworks for collective intelligence and digital stewardship.
His writing has been featured on Ground News and shared by independent researchers across both academic and technological communities.
ORCID: 0009-0002-0156-9795 Email: tim@smarterarticles.co.uk
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