Is "brain rot" real? What the research actually shows about short-form video

Short answer: Partly. The strongest evidence to date is a 2025 meta-analysis in Psychological Bulletin covering 71 studies and 98,299 people, which found short-form video use is associated with poorer attention (r = −.38) and inhibitory control (r = −.41). Those associations are real and moderate — but they are correlations, not proof that scrolling caused the damage. The best causal evidence is a 2025 randomized trial that blocked mobile internet for two weeks and improved sustained attention, mental health, and well-being, though only about a quarter of participants managed to comply. What works in practice is stacking several small frictions at once, not willpower and not a "dopamine detox."

This post is deliberately unexciting about it. Most writing on this topic repeats claims that are either untested or have already failed to replicate. Below is what the evidence supports, what it doesn't, and where the honest uncertainty sits.

Disclosure: Newzly is a social product and we have an obvious interest in this subject. We've tried to keep that out of the evidence sections; the one place we talk about ourselves is clearly marked, and it makes no health claim.

First: "brain rot" is a word, not a condition

Brain rot was Oxford's word of the year in 2024, defined roughly as the deterioration people feel in themselves after consuming too much trivial online content. It is a good piece of slang and it names something people genuinely experience. It is not a medical term, nothing in the research literature uses it, and no clinician can diagnose you with it.

The same goes for "short-form video addiction." It's a description, not a condition, and neither of the two diagnostic manuals recognizes it.

The American Psychiatric Association lists internet gaming disorder in DSM-5's Section III — "Conditions for Further Study," meaning it isn't a formal diagnosis — and the APA states plainly that the proposed condition is limited to gaming and "does not include problems with general use of the internet, online gambling, or use of social media or smartphones." The WHO's ICD-11 recognizes gaming disorder and nothing broader.

This matters for two practical reasons. If your use of these apps is genuinely disrupting your work, sleep, relationships, or health, that's a reason to talk to a clinician, not to read a blog post. And if it isn't, then framing an ordinary bad habit as an addiction tends to make people feel powerless about something that is, for most people, a solvable environment problem.

What the evidence actually shows

The largest study: association, not proof

The strongest single piece of evidence is a 2025 systematic review and meta-analysis in Psychological Bulletin — "Feeds, feelings, and focus" — pooling 71 studies and 98,299 participants.

Two things to hold onto. First, the attention and inhibitory-control findings are consistent and not small. Second, these are correlates. The title of the paper says so. People with poorer attention may scroll more, rather than scrolling causing poorer attention, and the design cannot separate those. The honest read is "strongly associated," not "proven to cause."

Worth noting the null results too: no association with body image or self-esteem, which cuts against a common assumption.

The best causal evidence, and its catch

In February 2025, PNAS Nexus published a preregistered randomized controlled trial by Castelo, Kushlev, Ward, Esterman, and Reiner. Participants installed an app that blocked all mobile internet on their phones for two weeks — no Wi-Fi, no mobile data — while still allowing calls, texts, and internet on a computer.

The results were large. 91% of participants improved on at least one outcome. The authors themselves put the numbers in context: the gain in sustained attention was "about the same magnitude as 10 years of age-related decline," and the effect on depression "was larger than the meta-analytic effect of antidepressants" and "similar to that of cognitive behavioral therapy."

Now the catch, which most coverage skipped. Of 467 participants, only 119 met the compliance criteria — roughly a quarter. The authors also note their sample was mostly people already motivated to cut down (83% rated their motivation at 5 or higher out of 7), that expectancy effects are possible since participants knew what the study was about, and that attrition favored people with better baseline mental health.

So: when it works, it works well. Three-quarters of a self-selected, motivated group couldn't do it. That failure rate is the most useful finding in the paper, and it's the reason the practical section below is about environment rather than resolve.

Time-boxed breaks help, but modestly

A 2025 meta-analysis in Behavioral Sciences pooled 20 randomized controlled trials and 10,106 participants on social media breaks. The pooled effect on well-being was d = 0.233 — positive, statistically real, and small.

That is a much more sober number than the PNAS trial, and both can be true: a short break produces a modest average benefit, while a strictly enforced two-week cut produces a large one in the minority who sustain it.

Two popular claims that don't hold up

"Dopamine detox." You cannot detox from dopamine. It is a neurotransmitter your brain manufactures and requires for ordinary function, including movement and motivation. There is a real and reasonable idea buried under the label — taking a break from very high-stimulation activity so that lower-stimulation activity feels worth doing again — but the mechanism as popularly described is not how the brain works, and no study has shown a "dopamine reset." Use the idea; drop the word.

"Just put your phone in another room." This one is genuinely unsettled, and almost nobody writing about it says so.

The claim comes from a well-known 2017 study, Brain Drain, which found that the mere presence of your own phone consumed cognitive capacity even when you successfully resisted checking it. Then a 2022 preregistered direct replication in Acta Psychologica ran the same tasks across six phone location and power conditions and found no effect at all.

But a 2023 meta-analysis in Behavioral Sciences, pooling 22 studies and 43 effects, did find a significant overall negative effect of smartphone presence on cognitive performance — while noting substantial heterogeneity and that not all cognitive domains are equally affected.

So the honest position is: contested, not debunked and not established. Moving your phone out of reach is free and may help you. Just don't let anyone tell you it's settled science in either direction.

What the evidence supports, ranked

1. Stack several small frictions at once — the best-supported approach

A randomized controlled trial published in the International Journal of Mental Health and Addiction (2022) offered participants ten nudge strategies rather than any single fix — disabling non-essential notifications, switching the display to grayscale, and eight similar changes — and let them choose which to adopt for two to six weeks.

Across two studies (N = 51 pre–post; N = 70 versus a screen-time-monitoring control), it reduced problematic smartphone use, cut screen time, lowered depressive symptoms, and improved sleep quality — and problematic-use scores stayed at normal levels for at least six weeks.

The useful design point is that the intervention was a menu of small environmental changes, not one decisive fix or an instruction to try harder. That is the shape of the thing that worked.

2. Turn off non-essential notifications

Part of the stack above, and the one with the clearest mechanism: an interruption you never receive is one you never have to resist. Leave calls and messages from actual people; turn off everything a company sends you to bring you back.

3. Grayscale — real, and smaller than the internet claims

Grayscale genuinely reduces screen time. Earlier work found reductions of roughly 22 to 50 minutes a day. But a 2024 study in Mobile Media & Communication found about a 20-minute daily reduction and no change in the number of times people unlocked their phones.

That second half is the interesting part. Grayscale makes the phone less rewarding to stay on; it does nothing to the habit of picking it up. Expect it to shorten sessions, not to stop reaching.

4. Remove the app, not just the time

The PNAS trial removed capability rather than asking for restraint, and that is the common thread across everything above that worked. Deleting the app from your phone while keeping the account on a browser is the low-cost version of the same idea: it doesn't forbid anything, it just adds enough steps that the automatic reach stops paying off.

5. A time-boxed break, with realistic expectations

d = 0.233. Worth doing, unlikely to be transformative on its own, and best used to create room for something else rather than as an end in itself.

The finding that gets left out: what fills the gap

The PNAS researchers reported something beyond the headline numbers. When people lost mobile internet, they spent more time socializing in person, exercising, and being outdoors — and for the group that went first, the well-being gains were still measurable two weeks after they got their phones back.

The detox literature points the same way from the other direction: results are inconsistent, and some studies find breaks increase loneliness. Removing a social habit leaves a social hole. What goes into it appears to matter as much as what came out.

If you take one thing from this post, take that. "Use your phone less" is a subtraction, and subtractions are hard to sustain — which is roughly what the 25% compliance rate is telling us. The interventions that held up replaced something.

Where Newzly fits — and where it doesn't

This is the part where we talk about our own product. It is not a health claim, and nothing in the research above was conducted on Newzly.

Newzly is a way for a small group of friends to keep up with each other without a feed of strangers. You write one line about your day, it gets set as a story on a dated newspaper page, and your friends read it — and you read theirs.

The relevant difference is structural, not therapeutic. There is no video in it. Nothing autoplays. A day's edition ends. You write, you read what your friends published, and you're finished — there is no mechanism designed to keep you there, because there's nothing to sell you by keeping you there. You can also turn discovery off entirely, hiding suggestions and the discover page, so the only people in it are ones you added yourself.

Two neighbouring posts, if one of those is the actual problem. If the feed you want out of is the one full of strangers rather than the one full of video, we compared five private social networks — including what you can fix inside Instagram first. And if you are curious how the writing half works, a chatbot can write a newspaper article but cannot set the page is its own post.

We are not going to tell you an app fixes attention. What we'd say honestly is narrower: if you're cutting short-form video and the research says the gap needs filling with something social, a finite thing you do with people you actually know is a more plausible candidate than another infinite feed.

It's free to start, no card, and you can try it without an account at newzly.app.

Sources

• Nguyen, L., Walters, J., Paul, S., Ijurco, S. M., Rainey, G. E., Parekh, N., Blair, G., & Darrah, M. (2025). Feeds, feelings, and focus: A systematic review and meta-analysis examining the cognitive and mental health correlates of short-form video use. Psychological Bulletin. doi:10.1037/bul0000498 · PubMed · summary
• Castelo, N., Kushlev, K., Ward, A. F., Esterman, M., & Reiner, P. B. (2025). Blocking mobile internet on smartphones improves sustained attention, mental health, and subjective well-being. PNAS Nexus, 4(2), pgaf017. Full text
• Liu, Y., Mohamad, E. M. W., Azlan, A. A., & Tan, Y. (2025). Am I Happier Without You? Social Media Detox and Well-Being: A Meta-Analysis of Randomized Controlled Trials. Behavioral Sciences. Full text
• Olson, J. A. et al. (2022). A Nudge-Based Intervention to Reduce Problematic Smartphone Use: Randomised Controlled Trial. International Journal of Mental Health and Addiction. Full text
• Dekker, C. A., & Baumgartner, S. E. (2024). Is life brighter when your phone is not? The efficacy of a grayscale smartphone intervention addressing digital well-being. Mobile Media & Communication. Full text
• Ward, A. F., Duke, K., Gneezy, A., & Bos, M. W. (2017). Brain Drain: The Mere Presence of One's Own Smartphone Reduces Available Cognitive Capacity. Journal of the Association for Consumer Research, 2(2). Full text
• Ruiz Pardo, A. C., & Minda, J. P. (2022). Reexamining the "brain drain" effect: A replication of Ward et al. (2017). Acta Psychologica, 230, 103717. doi:10.1016/j.actpsy.2022.103717 · PubMed
• Böttger, T., Poschik, M., & Zierer, K. (2023). Does the Brain Drain Effect Really Exist? A Meta-Analysis. Behavioral Sciences, 13(9), 751. Full text · PubMed
• American Psychiatric Association. Internet Gaming. psychiatry.org
• Mark, G. Attention Span / American Psychological Association interview on attention research. APA, Speaking of Psychology

Important: this is not medical advice

Everything above is a summary of published research, linked in full so you can read the primary sources yourself rather than take our word for it. It is general information for a general audience.

It is not medical, psychological, or clinical advice, and it is not a diagnosis or a treatment plan. Newzly is not a healthcare provider and no one involved in writing this is your clinician. Findings are reported as the researchers reported them, including the limitations they stated; where the evidence is correlational or has failed to replicate, we've said so, and none of it establishes what will happen for any individual person.

If your use of these apps is affecting your sleep, work, studies, relationships, or mental health, or if you're experiencing distress of any kind, please speak to a qualified healthcare professional. If you are in crisis, contact your local emergency services or a crisis line — in the US, call or text 988 for the Suicide & Crisis Lifeline.

Last reviewed: August 18, 2026. Research moves; if you're reading this much later, check the primary sources.