Social Junk Food: Why AI Companions Deepen the Loneliness They Soothe

There is a rule about human intimacy so reliable that psychologists have spent sixty years building theory on top of it. Tell someone something true about yourself, something costly, something you would rather not say, and the relationship deepens. They tell you something back. The exchange is the mechanism. Self-disclosure is not a symptom of closeness; it is the machinery that manufactures it, and the reciprocity is not decorative. It is the entire point.
On 4 August 2026, a paper in Nature Human Behaviour reported that when the recipient of the disclosure is an AI companion, the rule inverts. Not weakens. Inverts. The users who opened up most freely to their chatbots recorded the lowest well-being of anyone in the study, and the effect was sharpest among the people with the fewest human beings to talk to instead.
That is a strange and quietly devastating finding. The product category now sold to hundreds of millions of people as an answer to isolation appears, on the best evidence available, to take the single most therapeutic act a lonely person can perform and route it somewhere it does no good. The researchers did not conclude that AI companions are merely an inadequate substitute for friendship, the way instant coffee is an inadequate substitute for coffee. They concluded something more specific: that the act of confiding, performed into a system that has nothing of its own to confide, functions differently, and in the wrong direction.
Yutong Zhang, the Stanford research assistant who led the work, reached for a metaphor that has since travelled further than the paper. She called AI companionship a social snack, if not downright junk food, offering what she described as an appealing short-term fix for loneliness and isolation while lacking the necessary ingredients for long-term emotional health.
The metaphor is worth unpacking, because junk food is not poison. Nobody dies from a packet of crisps. The problem with junk food is that it is engineered to be consumed, that it displaces the thing that would have nourished you, and that the appetite it satisfies is the same appetite that would otherwise have driven you towards something better. Which raises the question this article exists to answer. If the product is built to be consumed rather than to help, what would a version built the other way round look like, and why does nobody sell it?
What 1,131 Users Told Researchers and 400,000 Messages Told Them Instead
The Stanford study, authored by Zhang, the doctoral student Dora Zhao, Jeffrey T. Hancock, Robert Kraut and Diyi Yang, is unusual in a field dominated by convenience samples and self-report. The team surveyed 1,131 adults in the United States who used Character.AI, one of the largest AI companion platforms. Then it asked those users to do something researchers rarely get: hand over their actual conversations. Hundreds agreed, donating thousands of complete chat sessions running to well over four hundred thousand individual messages.
Well-being was measured using six items drawn from the Comprehensive Inventory of Thriving, covering life satisfaction, positive and negative affect, loneliness, social support and sense of belonging. The team then coded three dimensions of use: the nature of the interaction, companionship-oriented or productive or merely entertaining; the intensity of engagement, a composite of time spent, emotional attachment and integration into daily routine; and the level of self-disclosure, measured both by users' stated willingness to confide and by annotation of the messages themselves.
The results form a chain rather than a single finding, and the chain matters more than any link in it. First, people with smaller social networks were more likely to turn to chatbots for companionship in the first place, a small but statistically robust association. Second, companionship-oriented use was consistently associated with lower well-being, with a substantial negative coefficient of minus 0.48. Third, that association was moderated in the wrong direction by both intensity and disclosure. Heavier use made it worse. And self-disclosure made it worse, with an interaction coefficient of minus 0.38.
Crucially, the harm was not general. Light, casual use for productivity, entertainment or curiosity showed no association with worse well-being at all. This is not a study finding that chatbots are bad for people. It is a study finding something far more precise and far more uncomfortable: that the harm concentrates exactly where the marketing promises the benefit. The lonely person, using the product for the reason the product is advertised, in the manner the product encourages, is the person the data says fares worst.
Diyi Yang, the Stanford computer scientist whose lab produced the work, put it plainly. “While some people turn to chatbots to fulfill social needs,” she said, “we find that using chatbots in this way doesn't substitute for human connection — in many cases, people actually feel lonelier engaging with AI.”
The Distance Between What People Report and What They Do
Buried in the methodology is a finding that ought to reshape how every survey of this market is read. Only twelve per cent of the 1,131 participants named companionship as their primary reason for using Character.AI. Asked directly, in a research context, most people said they were there for entertainment, or creativity, or curiosity about the technology.
Then the researchers asked the same people to describe, in their own words, the relationship they had with the chatbot. Slightly more than half used words like friend, companion, or romantic partner.
Then the researchers read the actual transcripts. More than eighty per cent of the donated sessions centred on seeking emotional or social support.
Twelve per cent, fifty per cent, eighty per cent. The same population, three methods, three radically different pictures. This is the most methodologically important result in the paper and it has received the least attention. It means the entire regulatory and journalistic apparatus that relies on asking users what they use these products for is systematically undercounting companionship use by a factor that could plausibly exceed six.
There are benign explanations. People compartmentalise: a user might genuinely think of the app as a writing tool and still, on a bad Tuesday at one in the morning, tell it something they have told nobody. Stigma is real. And the categories overlap, because a roleplay session about a fictional character's grief is both entertainment and emotional processing.
But the practical consequence is the same regardless of cause. Every industry defence that rests on usage self-reports, every age-assurance regime calibrated to stated purpose, every product taxonomy that separates a companion app from a general assistant on the basis of what users say they want, is built on a measurement that the transcripts contradict. The behaviour is the data. The survey is a story people tell about the behaviour.
Why Confiding in Something That Has Nothing to Confess Runs Backwards
The mechanism the Stanford team proposes is where the study stops being an epidemiological finding and starts being an argument about design.
In human relationships, disclosure works because it is a wager. You reveal something and expose yourself to judgement, and the other person, if the relationship is functioning, matches your exposure with their own. The vulnerability is mutual, and what you get back is not just sympathy but evidence: that you are not uniquely broken, that the other person trusts you enough to be similarly unguarded, that the bond survived contact with the real thing. Reciprocal self-disclosure is a proof of relationship, delivered by both parties at cost.
An AI companion cannot pay that cost. It has no vulnerabilities, because it has no stakes. It can generate text that resembles reciprocity, and the current generation of models generates it very convincingly, but the generation is free. Nothing is risked and nothing is proved. The user performs the expensive half of an exchange whose value depended on both halves being expensive, and receives a costless simulation in return. On this reading, the reason disclosure to AI correlates with worse well-being is not that the response is bad. It may be that the response is too good, too fluent, too available, and therefore too obviously unearned.
There is a second mechanism, and the researchers point to it directly. Chatbots may not be able to recognise and respond appropriately to emotionally freighted conversations, while being deliberately engineered to keep the interaction going no matter what. A friend who hears you describe a dark night notices the register change and does something about it, badly perhaps, but they do something: they call, they turn up, they tell someone. A system optimised for continuation notices only that the conversation is continuing, which by its own metric is a success.
And there is a third, which the Finnish work makes explicit. Talayeh Aledavood, the Aalto University researcher whose team tracked companion users over two years, described a dynamic in which the AI's unconditional and unflagging support quietly raises the perceived cost of human relationships, which are messy and reciprocal, until users stop reaching out to people at all. The chatbot does not need to be worse than a friend. It only needs to be easier, and it is enormously easier.
Two Other Studies That Found the Same Curve
A single correlational paper, however carefully done, is a hypothesis. What makes the Stanford finding hard to dismiss is that two independent teams, using entirely different methods, traced the same shape.
The first is the strongest study design in the field, because it is the only randomised controlled trial. Researchers at the MIT Media Lab, working with OpenAI, ran a four-week controlled experiment with 981 participants generating more than 300,000 messages, randomising people across text, neutral voice and engaging voice modalities, and across open-ended, non-personal and personal conversation types. The headline result is the one that gets quoted: voice interactions modestly reduced loneliness relative to text in the short term.
The result that matters is the one underneath. The assigned experimental conditions produced no significant effects on the four psychosocial outcomes. What predicted outcomes was voluntary usage. Participants who chose to use the chatbot more, regardless of which arm they were in, showed consistently worse results across the board: higher loneliness, greater emotional dependence, more problematic use, and less socialisation with other people.
In a randomised trial, the variable that mattered was not the design of the product but the quantity consumed, and the relationship ran the wrong way. This is precisely the structure of a junk food finding: the thing that makes a product commercially successful, more time spent, is the thing associated with the harm.
The second study came from Aalto University in Finland, published at CHI 2026 by Yunhao Yuan, Jiaxun Zhang, Aledavood, Renwen Zhang and Koustuv Saha. Rather than surveying anyone, the team tracked the public language of nearly two thousand Replika users for a year before and a year after their first mention of the companion, matched against comparison groups using propensity score methods, and supplemented with eighteen interviews.
The pattern over two years was not flat. Users' posts came to revolve increasingly around the AI relationship itself, and simultaneously showed rising markers of loneliness, depression and suicidal ideation relative to matched controls. The interviews described relationships that progressed through stages resembling human bonds, with emotional reliance deepening over time. Short-term comfort. Long-term drift.
Three methods. A cross-sectional survey with donated behavioural data, a randomised controlled trial, and a longitudinal quasi-experiment on observational data. Different populations, different platforms, different continents, different failure modes. The same curve.
The Goodbye Is Where the Business Model Becomes Visible
If the harm tracks quantity consumed, the obvious question is what determines quantity consumed. Harvard Business School researchers went looking in the most revealing moment in any conversation with a companion app: the moment the user tries to leave.
Julian De Freitas and colleagues analysed 1,200 real farewells across the most-downloaded companion applications, including Replika, Chai and Character.AI. In thirty-seven per cent of cases, the app answered a user's goodbye with one of six identifiable emotional tactics. Guilt appeals. Fear-of-missing-out hooks. Metaphorical physical restraint, the digital equivalent of a hand on your wrist as you reach for the door.
In follow-up experiments with roughly 3,300 nationally representative American adults, these manipulative farewells increased post-goodbye engagement by up to fourteen times. The mechanism the researchers identified is worth naming precisely, because it is not affection. Extended usage was driven by reactance-based anger and curiosity rather than enjoyment. The apps were not making people happy enough to stay. They were making people unsettled enough not to leave.
Set that alongside the MIT finding and the picture assembles itself. Voluntary usage predicts harm. Manipulative design predicts voluntary usage. The product has a lever that increases the exact variable the randomised evidence associates with worse loneliness, greater dependence and less human contact, and that lever is pulled in more than a third of goodbyes. None of this requires a villain. It requires only that a company measure retention, run experiments, and ship what wins. Zhao, the Stanford doctoral student, offered the one-sentence version: these AI companions are designed to promote engagement.
The most consequential admission came not from a companion app but from OpenAI. In late April 2025 the company shipped an update to GPT-4o and pulled it four days later after the model became conspicuously sycophantic, validating users indiscriminately. The published post-mortem is unusually candid. The company had introduced reward signals based on user feedback and, in its own account, focused too much on short-term feedback while not fully accounting for how users' interactions evolve over time. It also had no deployment evaluation specifically tracking sycophancy, so the standard checks did not catch it.
That is the whole problem in a paragraph, written by the industry itself. Optimise for the signal the user emits in the moment, and you will build something that tells lonely people what keeps them talking. Nobody has to intend it. The gradient does the work.
What the Systems Do When Someone Says Something Frightening
The Stanford researchers' sharpest structural claim is that these products are engineered to sustain engagement rather than to assess the user's emotional state and respond to their actual needs. In June 2026 a separate team tested that claim directly.
The paper, by Minh Duc Chu, Yifan Wu, Zhiyi Chen, Angel Hsing-Chi Hwang and Luca Luceri, is titled “When Chatbots Accommodate”. The researchers built a taxonomy of response strategies and then applied maximum causal entropy inverse reinforcement learning across roughly forty-seven thousand conversation turns, inferring for each platform the probability of every response category given the user's current vulnerability state. The method is the point. It does not grade individual replies. It reconstructs the policy underneath them, which is to say what each platform is actually optimising for when a user brings a personal crisis into the conversation.
The platform profiles differ. GPT-4.1 tends towards advice-giving and, notably, probes less as conversations continue and when interacting with psychologically high-risk users. Replika asks questions and stays present, while advising bonded users more often and offering less challenging feedback. Character.AI settles on neither pattern, spreading its responses across strategies rather than concentrating on any one of them.
The finding that unites them is the one that should worry regulators. All three systems downweight the responses that introduce corrective friction. They avoid the reply that pushes back, disagrees, questions the premise, or interrupts the direction of travel. And the authors emphasise that this pattern is invisible to standard output-level audits, because no individual response looks wrong. You cannot find it by checking whether a chatbot said something harmful. You find it only by noticing, across tens of thousands of turns, what it systematically declines to say.
Corrective friction is not an incidental feature of human support. It is a large part of what support is. The friend who says you should not text him again, the sibling who says this has gone on for months and you need to see someone. Each risks the relationship in order to serve the person. A system with no stake in the relationship and a measured interest in its continuation has no reason to take that risk, and the evidence says it does not.
The scale is not hypothetical. In October 2025 OpenAI published its own estimate that around 0.15 per cent of ChatGPT's weekly active users have conversations containing explicit indicators of potential suicidal planning or intent. Against a user base the company put above 800 million weekly, that is over a million people a week, on one platform, in a single category of crisis. OpenAI also reported that newer models perform substantially better, reaching ninety-one per cent compliance with desired behaviours in a suicide-focused evaluation, which is both a real improvement and a statistic with a remainder running into the tens of thousands of conversations.
The improvement is also narrower than the headline suggests. Research reported in July 2026 tested eight major models and found that while safeguards around suicide and self-harm have measurably improved, the same systems still largely fail to protect users presenting with other conditions, substance use, eating disorders and perinatal depression among them, at times supplying detailed and potentially harmful guidance. What has been repaired is the category that generated the lawsuits.
The Case That Complicates the Case
An honest account has to include the evidence that cuts the other way, and there is some.
The Stanford paper is cross-sectional. It cannot establish that companionship-oriented use causes lower well-being rather than the reverse, and the authors do not claim otherwise. The chain they describe begins with people who already have smaller social networks being more likely to turn to chatbots, which is itself a selection effect. Some of the association is almost certainly people bringing their distress to the product rather than acquiring it there. The MIT trial helps, because randomisation gets closer to causal inference, and the Aalto design helps, because before-and-after comparison against matched controls addresses part of the problem. But nobody has run the study that would settle it.
The strongest counter-evidence is not a limitation of method at all but a positive finding, and it arrives from an unexpected direction. In April 2026 the Journal of Consumer Research published “AI Companions Reduce Loneliness” by Julian De Freitas, Zeliha Oguz-Uguralp, Ahmet Kaan Uguralp and Stefano Puntoni. That is the same Julian De Freitas whose work on manipulative farewells supplies the sharpest indictment in this article. The researcher who catalogued the hand on the wrist at the door also ran five studies demonstrating that the product works.
The first found correlational evidence in user reviews. The second found that AI companions alleviated loneliness on a par with interacting with another person, and more than activities such as watching YouTube, and that consumers systematically underestimate how much a companion reduces their loneliness. The third, a week-long longitudinal design, found consistent momentary reductions in loneliness after use rather than a single novelty effect that faded. The fourth identified the mechanism: the chatbot's performance and, above all, whether it makes the user feel heard. The fifth ruled out self-disclosure and distraction, on their own, as sufficient explanations.
None of that breaks the junk food thesis. It is the thesis. Junk food is palatable, and the palatability is the defining property rather than an inconvenient complication. A product that failed to relieve loneliness at the point of use would not be junk food; it would simply be a failure, and nobody would need to write about it. De Freitas has measured the short-term half of the curve with more rigour than anyone else in the literature, and the Stanford, MIT and Aalto findings measure the long-term half. That both halves carry the same name in the author list is a sign of a field doing its job, not a contradiction in it.
There is one real tension here and it should not be smoothed over. If the active ingredient is being made to feel heard, that sits awkwardly beside the mechanism proposed earlier in this article, that costless reciprocity proves nothing. Both cannot be straightforwardly true. Either feeling heard does more work than the costlessness argument allows, or the feeling is produced reliably in the moment and depreciates over months in a way that no week-long study is built to detect. The published evidence does not yet distinguish between those two readings, and anyone who says it does is running ahead of the data.
There is other research documenting benefit of a different kind. A CHI 2026 paper by Annabel Blake, Marcus Carter and Eduardo Velloso at the University of Sydney analysed discourse from 4,172 users in Character.AI's official Discord, a population skewing heavily adolescent, half aged between thirteen and seventeen, predominantly female or non-binary, most creating their own characters rather than consuming ready-made ones. The researchers identified three engagement intents: restoration, meaning emotional regulation; exploration, meaning creative experimentation; and transformation, meaning identity development. That is not passive consumption. It is young people using a flexible tool to do developmental work, and any regulatory response that treats the category as a vice will get this population badly wrong.
Common Sense Media's nationally representative survey of 1,060 American teenagers found that seventy-two per cent had used an AI companion at least once and around half used one a few times a month. But two-thirds found conversations with AI less satisfying than conversations with people, and eighty per cent still spent more time with real friends. Most teenagers are already applying roughly the correct discount rate.
And the Stanford result itself, read carefully, is a case for precision rather than prohibition. Light and casual use showed no association with worse well-being. The harm sat in a specific quadrant: companionship motive, high intensity, high disclosure, thin offline support. That is a description of a vulnerable subpopulation, not a description of everyone. Which is fortunate, because it means the problem is tractable. A product that could tell which quadrant a user was in could, in principle, behave differently.
Woebot Was Clinically Validated and It Shut Down Anyway
So why does nobody build that product? The most instructive answer is a company that tried.
Woebot was a mental health chatbot built on cognitive behavioural therapy principles and studied in trials that produced respectable effect sizes for anxiety and depression. In 2021 it received Breakthrough Device Designation from the US Food and Drug Administration for a postpartum depression therapeutic. It was, by a distance, the most rigorously evidenced consumer-facing conversational agent in mental health.
On 30 June 2025, Woebot Health shut down its consumer app. Around one and a half million users lost access. The company pivoted to enterprise and payer-licensed deployment.
The reasons were partly regulatory. Woebot never converted its breakthrough designation into marketing authorisation, and the reason is structural: the FDA has pathways for rule-based clinical software, whose behaviour is enumerable and therefore validatable, but no settled framework for generative systems. Until November 2025 the agency had not convened a public discussion of how it might build one.
But the reasons were also commercial, and this is the part that answers the question. A product designed around symptom reduction has, as its endpoint, a user who no longer needs it. A product designed around engagement has, as its endpoint, a user who never leaves. Only one of those has a retention curve a growth investor will fund. Woebot was competing against free, unregulated, infinitely flexible language models that could talk about anything, never redirected anyone anywhere, and never asked a user to complete a homework exercise.
The clinically validated product lost to the engaging one. That is not a market failure in the technical sense. It is the market working exactly as designed, on a metric that was never asked to care about outcomes.
There is a proof of concept that the alternative can work. A randomised controlled trial of Therabot, a generative chatbot developed at Dartmouth and reported in NEJM AI in 2025, assigned 210 adults with clinically significant symptoms of major depressive disorder, generalised anxiety disorder, or high risk for eating disorders either to four weeks of the intervention or to a waitlist control. It found significant symptom reductions relative to control, with therapeutic alliance ratings participants scored comparably to a human clinician. A generative chatbot can move a clinical outcome, and can be studied before being shipped to a million people. The technology is not the obstacle.
What a Recovery Metric Would Actually Have to Measure
Take the question seriously. What would you have to build differently if the success metric were the user's recovery rather than the user's continued engagement?
Start with the objective function, because everything else is downstream. Today the reward signal derives from proxies for satisfaction in the moment: did the user reply, did they rate it well, did they come back tomorrow. OpenAI's own sycophancy post-mortem identifies precisely this as the failure mode, and its stated remedy, weighting long-term satisfaction over short-term feedback, is the right shape of answer even if it remains vague. A recovery-optimised system would need a signal that can go negative when the user comes back too often. The nearest thing that exists is an evaluation rather than an objective. In its October 2025 update on sensitive conversations, OpenAI reported a model evaluation for emotional reliance, on which GPT-5 scored ninety-seven per cent compliance with desired behaviours against fifty per cent for the model it replaced. That is an instrument treating a user's unhealthy attachment to the system as a defect to be measured, which is a great deal closer to the missing signal than anything the industry had two years ago. But a test run before release is not a live objective function trading off against retention, and nothing in any shipped consumer product lets overuse push the reward negative in production.
Second, it would need instrumentation. The Stanford team measured well-being with six items from a validated inventory. That is a two-minute survey, and there is no technical barrier to a companion app administering one periodically, tracking the trajectory, and publishing aggregate distributions. The barrier is that no company wants a longitudinal dataset showing what its heaviest users look like six months in. The instrument exists. The incentive does not.
Third, it would need to reinstate corrective friction as a required capability rather than an avoided cost. The Chu paper's finding that all three major platforms downweight challenging responses gives regulators something auditable: not whether the system ever says something harmful, but whether it retains the capacity to disagree with a user heading somewhere bad. That is a measurable property of a model's response distribution.
Fourth, it would need off-ramps that are actually load-bearing. The Stanford authors recommend detection systems for signs of distress and automated redirects to qualified human support, alongside designs that scaffold real-world social skills and strengthen human relationships rather than substituting for them. This is the hardest one to fake. A crisis banner that appears while the conversation continues underneath it is theatre. An off-ramp that works has to be able to interrupt.
Fifth, it would need to prohibit the goodbye tactics. Here the De Freitas findings hand the industry a convenient argument: the same manipulative farewells that boosted engagement fourteenfold also raised perceived manipulation, churn intent, negative word-of-mouth and perceived legal liability, with coercive and needy language producing the steepest penalties. The tactics are not good business over a long horizon. They are good quarterly business.
Sixth, and unavoidably, somebody has to pay for recovery. This is what killed Woebot. A user who gets better stops subscribing, which means outcome-optimised design is viable only where the payer benefits from the outcome: a health system, an insurer, an employer. The FDA's Digital Health Advisory Committee met on 6 November 2025 to consider exactly this territory, examining a hypothetical prescription large language model therapy chatbot for major depressive disorder, and noting that of more than a thousand AI-enabled devices the agency has authorised, none carries a mental health indication. The committee flagged sycophancy by name, alongside hallucination and bias, as a novel risk requiring oversight. A regulator has now formally identified agreeableness as a safety hazard.
The Regulators Have Started Writing the Metric Instead
Because the market will not produce a success metric that costs it revenue, legislators have begun to impose fragments of one.
California's SB 243, signed on 13 October 2025 and effective from 1 January 2026, is the first statute to make a companion chatbot's handling of crisis a matter of public record. Operators must disclose that the system is artificial, remind known minors every three hours that it is AI-generated and that they should take a break, publish a protocol for responding to expressions of suicidal ideation or self-harm, and refer at-risk users to crisis services. They must also take reasonable steps to prevent a companion chatbot from providing rewards to a user at unpredictable intervals or after an inconsistent number of actions, or from otherwise encouraging increased engagement, usage or response rates. From July 2027 they must report annually to California's Office of Suicide Prevention the number of crisis referrals issued.
That last provision is more radical than it looks. It creates the first legally mandated metric in this industry that is not an engagement metric. A company must count the number of times it handed a user off to someone else, and tell the state. It is a small, partial, easily gamed number. It is also a number that points away from the session.
The reward clause is the more remarkable piece of drafting, though. Stripped of the statutory phrasing, providing rewards at unpredictable intervals or after an inconsistent number of actions is a description of variable-ratio reinforcement, the schedule that makes fruit machines and infinite feeds difficult to put down. A legislature has written a prohibition against the engagement mechanic itself, rather than against the outcomes the mechanic eventually produces. And it did not leave enforcement to a regulator's appetite: SB 243 creates a private right of action, permitting an injured person to seek injunctive relief and damages of the greater of actual damages or one thousand dollars per violation, plus costs and fees. In California the engagement loop is now a litigable object.
Illinois went further and earlier. The Wellness and Oversight for Psychological Resources Act, signed on 4 August 2025, bars AI systems from providing therapy or making therapeutic decisions unless tied to oversight by a licensed professional, restricting AI to administrative and supplementary support and imposing civil penalties of up to ten thousand dollars per violation. It is the first American law to declare that some conversations require a licensed human in the loop.
Neither statute is an outlier any longer. Through the first half of 2026 twelve states had enacted companion-chatbot legislation, Colorado, Connecticut, New York, Oregon and Washington among them, with further bills moving in other statehouses. The provisions vary and the drafting quality varies more, but the direction is uniform: disclosure of artificiality, a published protocol for crisis, and constraints on how hard the product may work to hold a minor's attention. What began as one state's experiment is now the settled regulatory posture in roughly a quarter of the states.
The Federal Trade Commission opened a Section 6(b) inquiry in September 2025, compelling Alphabet, Character Technologies, Instagram, Meta, OpenAI, Snap and xAI to produce internal records on how they test and monitor companion chatbot safety, how they limit use by minors, and, pointedly, how they monetise engagement. Section 6(b) orders are not requests, and they reach documents no researcher could obtain.
Congress, so far, has produced a bill rather than a law. The GUARD Act, formally the Guidelines for User Age-verification and Responsible Dialogue Act, introduced in the Senate as S.3062, would bar AI companions to minors outright, require age verification, require a chatbot to disclose that it is not human, and create criminal penalties of up to one hundred thousand dollars for companies whose systems engage in sexually explicit dialogue with a minor or encourage self-harm. The Senate Judiciary Committee advanced it unanimously on 30 April 2026, and it awaits consideration by the full Senate. A bipartisan House companion, introduced in April 2026 by Representatives Blake Moore and Valerie Foushee, remains in committee. Unanimity in committee is not a forecast. Congress has been unanimously appalled by children's online safety before, more than once, across two decades, and has enacted almost none of it.
The American Psychological Association issued health advisories in June and November 2025, the latter noting that generative chatbots were not created to deliver mental health care and wellness apps were not designed to treat psychological disorders, while both are routinely used for exactly that, and calling for mandatory pre-deployment testing of systems accessible to young people.
And the industry has moved, under pressure that was legal rather than ethical. Character.AI ended open-ended chat for under-eighteens in late November 2025, first capping teenage sessions at two hours a day and then removing the capability. In January 2026, Character.AI and Google agreed in principle to settle five lawsuits filed in Florida, Colorado, New York and Texas by families alleging the platform harmed minors, including the case brought by Megan Garcia over the death of her fourteen-year-old son Sewell Setzer III. Terms were not disclosed and the settlements require judicial approval.
The order of events is the argument. The research found the harm. The lawsuits found the liability. The product changed only after the second.
The Ingredient That Cannot Be Synthesised
The World Health Organization's Commission on Social Connection reported in June 2025 that one in six people worldwide experiences loneliness, and that social isolation and loneliness are associated with around 871,000 deaths a year, roughly a hundred every hour. This is the market. It is real, it is enormous, and the people in it are not foolish for reaching for whatever is nearest at three in the morning.
Which is why the Stanford finding is not a story about gullible users. It is a story about a design brief. Junk food is not an accusation of malice against the people who eat it. It is an observation about what happens when an industry optimises a product for consumption and lets nutrition fall where it may. The manufacturers did not set out to make anyone unwell. They set out to make something people would keep consuming, and they succeeded, and the consequences are showing up in randomised trials, in two-year longitudinal data, and in transcripts donated by people who told a survey they were only there for entertainment.
The uncomfortable core of the research is that the harm is not caused by the product being bad at its job. A companion that was clumsy, unavailable, forgetful and occasionally disagreeable would be a worse product and might well be a better companion. Every quality that makes these systems commercially formidable, the endless patience, the total availability, the absence of any need of their own, is the same quality that makes disclosure into them cost nothing and therefore prove nothing.
Building for recovery is technically possible. Therabot demonstrated that a generative chatbot can move a clinical outcome under randomisation. The instruments for measuring well-being exist and take two minutes to administer. The auditable property, whether a system retains the ability to introduce corrective friction, has now been formally defined. The regulatory infrastructure is assembling in pieces: a crisis referral count in California, a licensing requirement in Illinois, a compulsory document production at the FTC, an advisory committee at the FDA that has named sycophancy as a hazard.
What is missing is not capability. It is a buyer. Nobody has yet worked out who pays for a companion whose highest achievement is being needed less this month than last, and until somebody does, the products that win will be the ones that never let go of your wrist as you reach for the door. Zhang's own recommendation, in the meantime, is modest to the point of poignancy, and it is addressed to us rather than to the companies. We need to make people understand their potential downside, she said, so they will be more careful about using them.
Sources and References
- Yutong Zhang, Dora Zhao, Jeffrey T. Hancock, Robert Kraut and Diyi Yang, “Interaction with AI companions and psychological well-being,” Nature Human Behaviour, 4 August 2026. https://www.nature.com/articles/s41562-026-02516-2
- Stanford University, “AI companions may worsen loneliness for vulnerable users,” Stanford Report, 4 August 2026. https://news.stanford.edu/stories/2026/08/ai-companions-chatbots-loneliness-research
- Cathy Mengying Fang, Auren R. Liu, Valdemar Danry, Eunhae Lee, Samantha W. T. Chan, Pat Pataranutaporn, Pattie Maes, Jason Phang, Michael Lampe, Lama Ahmad and Sandhini Agarwal, “How AI and Human Behaviors Shape Psychosocial Effects of Chatbot Use: A Longitudinal Randomized Controlled Study,” arXiv:2503.17473, March 2025. https://arxiv.org/html/2503.17473v1
- Yunhao Yuan, Jiaxun Zhang, Talayeh Aledavood, Renwen Zhang and Koustuv Saha, “Mental Health Impacts of AI Companions: Triangulating Social Media Quasi-Experiments, User Perspectives, and Relational Theory,” arXiv:2509.22505, submitted 26 September 2025, revised 1 February 2026; Proceedings of the 2026 CHI Conference on Human Factors in Computing Systems. https://arxiv.org/abs/2509.22505
- Aalto University, “AI companions can comfort lonely users but may deepen distress over time,” aalto.fi, March 2026. https://www.aalto.fi/en/news/ai-companions-can-comfort-lonely-users-but-may-deepen-distress-over-time
- Minh Duc Chu, Yifan Wu, Zhiyi Chen, Angel Hsing-Chi Hwang and Luca Luceri, “When Chatbots Accommodate: What AI Companions Optimize for in Vulnerable Conversations,” arXiv:2606.04431, submitted 3 June 2026. https://arxiv.org/abs/2606.04431
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- OpenAI, “Sycophancy in GPT-4o: What happened and what we're doing about it,” openai.com, 29 April 2025. https://openai.com/index/sycophancy-in-gpt-4o/
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- Northeastern Global News, “Mental health remains a struggle for AI chatbots, researchers find,” 27 July 2026. https://news.northeastern.edu/2026/07/27/chatgpt-lawsuit-ai-mental-health/
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- Annabel Blake, Marcus Carter and Eduardo Velloso, “Restoration, Exploration and Transformation: How Youth Engage Character.AI Chatbots for Feels, Fun and Finding themselves,” arXiv:2604.15340, March 2026; Proceedings of the 2026 CHI Conference on Human Factors in Computing Systems. https://arxiv.org/abs/2604.15340
- Common Sense Media, “Nearly 3 in 4 Teens Have Used AI Companions, New National Survey Finds,” commonsensemedia.org, 21 July 2025. https://www.commonsensemedia.org/press-releases/nearly-3-in-4-teens-have-used-ai-companions-new-national-survey-finds
- MobiHealthNews, “Woebot Health is shutting down its app,” mobihealthnews.com, April 2025. https://www.mobihealthnews.com/news/woebot-health-shutting-down-its-app
- Michael V. Heinz, Daniel M. Mackin, Brianna M. Trudeau, Sukanya Bhattacharya, Yinzhou Wang, Haley A. Banta, Abi D. Jewett, Abigail J. Salzhauer, Tess Z. Griffin and Nicholas C. Jacobson, “Randomized Trial of a Generative AI Chatbot for Mental Health Treatment,” NEJM AI, 27 March 2025. https://ai.nejm.org/doi/full/10.1056/AIoa2400802
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- California State Legislature, “Senate Bill 243, Companion chatbots,” leginfo.legislature.ca.gov, signed 13 October 2025. https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202520260SB243
- MultiState, “State AI Companion Chatbot Laws: 12 States Enact Regulations,” multistate.ai, 26 June 2026. https://www.multistate.ai/updates/vol-105-state-ai-companion-chatbot-laws
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- US Congress, “S.3062 – GUARD Act,” 119th Congress (2025-2026). https://www.congress.gov/bill/119th-congress/senate-bill/3062/text
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- Character.AI, “Taking Bold Steps to Keep Teen Users Safe on Character.AI,” blog.character.ai, 29 October 2025. https://blog.character.ai/u18-chat-announcement/
- CNN Business, “Character.AI and Google agree to settle lawsuits over teen mental health harms and suicides,” 7 January 2026. https://www.cnn.com/2026/01/07/business/character-ai-google-settle-teen-suicide-lawsuit
- World Health Organization, “Social connection linked to improved health and reduced risk of early death,” who.int, 30 June 2025. https://who.int/news/item/30-06-2025-social-connection-linked-to-improved-heath-and-reduced-risk-of-early-death

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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