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Google AI Overviews cite YouTube more than any medical site for health queries

https://www.theguardian.com/technology/2026/jan/24/google-ai-overviews-youtube-medical-citations-study
77•bookofjoe•1h ago

Comments

jeffbee•1h ago
The assumption appears to be that the linked videos are less informative than "netdoktor" but that point is left unproven.
delichon•59m ago
I imagine that it is rare for companies to not preferentially reference content on their own sites. Does anyone know of one? The opposite would be newsworthy. If you have an expectation that Google is somehow neutral with respect to search results, I wonder how you came by it.
alex1138•55m ago
How do I respond to this nicely without getting my comment flagged
morserer•41m ago
People don't flag comments because of tone, they flag (and downvote) comments that violate the HN guidelines (https://news.ycombinator.com/newsguidelines.html). I skimmed your comment history and a ton of your recent comments violate a number of these guidelines.

Follow them and you should be able to comment without further issue. Hope this helps.

grayhatter•25m ago
I feel like you completely missed the point of the rhetorical question.
neom•54m ago
Further context: https://health.youtube/ and https://support.google.com/youtube/answer/12796915?hl=en and https://www.theverge.com/2022/10/27/23426353/youtube-doctors... (2022)
alex1138•52m ago
> High-quality health information

Oh, you mean like removing scores of covid videos from real doctors and scientists which were deemed to be misinformation

I'm glad that we've decided Youtube is the oracle for everything

sofixa•26m ago
> Oh, you mean like removing scores of covid videos from real doctors and scientists which were deemed to be misinformation

The credentials don't matter, the actual content does. And if it's misinformation, then yes, you can be a quadruple doctor, it's still misinformation.

In France, there was a real doctor, epidemiologist, who became famous because he was pushing a cure for Covid. He did some underground, barely legal, medical trials on his own, and proclaimed victory and that the "big bad government doesn't want you to know!". Well, the actual proper study finished, found there is basically no difference, and his solution wasn't adopted. He didn't get deplatformed fully, but he was definitely marginalised and fell in the "disinformation" category. Nonetheless, he continued spouting his version that was proven wrong. And years later, he's still wrong.

Fun fact about him: he's in the top 10 of scientists with the most retracted papers, for inaccuracies.

alex1138•19m ago
I'm talking about people like this https://rumble.com/vt62y6-covid-19-a-second-opinion.html who at one point or another have all been censored
gumboshoes•16m ago
How is any non-expert supposed to judge the content without some kind of guide like say credentials? Credentials do matter when the author is unknown.
xnx•50m ago
Sounds very misleading. Web pages come from many sources, but most video is hosted on YouTube. Those YouTube videos may still be from Mayo clinic. It's like saying most medical information comes from Apache, Nginx, or IIS.
barbazoo•24m ago
> Google’s search feature AI Overviews cites YouTube more than any medical website when answering queries about health conditions

It matters in the context of health related queries.

> Researchers at SE Ranking, a search engine optimisation platform, found YouTube made up 4.43% of all AI Overview citations. No hospital network, government health portal, medical association or academic institution came close to that number, they said.

> “This matters because YouTube is not a medical publisher,” the researchers wrote. “It is a general-purpose video platform. Anyone can upload content there (eg board-certified physicians, hospital channels, but also wellness influencers, life coaches, and creators with no medical training at all).”

gowld•19m ago
To the Guardian's credit, at the bottom they explicitly cited the researchers walking back their own research claims.

> However, the researchers cautioned that these videos represented fewer than 1% of all the YouTube links cited by AI Overviews on health.

> “Most of them (24 out of 25) come from medical-related channels like hospitals, clinics and health organisations,” the researchers wrote. “On top of that, 21 of the 25 videos clearly note that the content was created by a licensed or trusted source.

> “So at first glance it looks pretty reassuring. But it’s important to remember that these 25 videos are just a tiny slice (less than 1% of all YouTube links AI Overviews actually cite). With the rest of the videos, the situation could be very different.”

gumboshoes•18m ago
Might be but aren't. They're inevitably someone I've never heard of from no recognizable organization. If they have credentials, they are invisible to me.
jdlyga•48m ago
It's tough convincing people that Google AI overviews are often very wrong. People think that if it's displayed so prominently on Google, it must be factually accurate right?

"AI responses may include mistakes. Learn more"

It's not mistakes, half the time it's completely wrong and total bullshit information. Even comparing it to other AI, if you put the same question into GPT 5.2 or Gemini, you get much more accurate answers.

alex1138•44m ago
It absolutely baffles me they didn't do more work or testing on this. Their (unofficial??) motto is literally Search. That's what they're known for. The fact it's trash is an unbelievably damning indictment of what they are
bethekidyouwant•24m ago
Testing what every possible combination of words? Did they test their search results before AI in this way?
gowld•13m ago
That's because decent (but still flawed) GenAI is expensive. The AI Overview model is even cheaper than the AI Mode model, which is cheaper than the Gemini free model, which is cheaper than the Gemini Thinking model, which is cheaer than the Gemini Pro model, which is still very misleading when working on human language source content. (It's much better at math and code).
not_good_coder•42m ago
The authoritative sources of medical information is debatable in general. Chatting with initial results to ask for a breakdown of sources with classified recommendations is a logical 2nd step for context.
laborcontract•38m ago
Google AI overviews are often bad, yes, but why is youtube as a source necessarily a bad thing? Are these researchers doctors? A close relative is a practicing surgeon and a professor in his field. He watches youtube videos of surgeries practically every day. Doctors from every field well understand that YT is a great way to share their work and discuss w/ others.

Before we get too worked up about the results, just look at the source. It's a SERP ranking aggregator (not linking to them to give them free marketing) that's analyzing only the domains, not the credibility of the content itself.

This report is a nothingburger.

ceejayoz•27m ago
> A close relative is a practicing surgeon and a professor in his field. He watches youtube videos of surgeries practically every day.

A professor in the field can probably go "ok this video is bullshit" a couple minutes in if it's wrong. They can identify a bad surgeon, a dangerous technique, or an edge case that may not be covered.

You and I cannot. Basically, the same problem the general public has with phishing, but even more devastating potential consequences.

raincole•22m ago
The same can be said for average "medical sites" the Google search gives you anyway.
ceejayoz•16m ago
It's a lot easier for me to assess the Mayo Clinic's website being legitimate than an individual YouTuber's channel.
laborcontract•21m ago
Your comment doesn't address my point. The same criticism applies to any medium.
ceejayoz•15m ago
The point is you can't say "an expert finds x useful in their field y" and expect it to always mean "any random idiot will find x useful in field y".
mikkupikku•37m ago
Don't all real/respectable medical websites basically just say "Go talk to a real doctor, dummy."?

...and then there's WebMD, "oh you've had a cough since yesterday? It's probably terminal lung cancer."

gowld•18m ago
WebMD is a real doctor, I guess. It's got an MD right in the name!
abixb•35m ago
Heavy Gemini user here, another observation: Gemini cites lots of "AI generated" videos as its primary source, which creates a closed loop and has the potential to debase shared reality.

A few days ago, I asked it some questions on Russia's industrial base and military hardware manufacturing capability, and it wrote a very convincing response, except the video embedded at the end of the response was an AI generated one. It might have had actual facts, but overall, my trust in Gemini's response to my query went DOWN after I noticed the AI generated video attached as the source.

Countering debasement of shared reality and NOT using AI generated videos as sources should be a HUGE priority for Google.

YouTube channels with AI generated videos have exploded in sheer quantity, and I think majority of the new channels and videos uploaded to YouTube might actually be AI; "Dead internet theory," et al.

panki27•8m ago
Ourobouros - The mythical snake that eats its own tail (and ingests its own excrement)
no_wizard•7m ago
>Countering debasement of shared reality and NOT using AI generated videos as sources should be a HUGE priority for Google.

This itself seems pretty damning of these AI systems from a narrative point of view, if we take it at face value.

You can't trust AI to generate things that are sufficiently grounded in facts that you can't even use it as a reference point. Why should end users believe the narrative that these things are as capable as they're being told they are, by extension?

paulddraper•34m ago
Same energy as “lol you really used Wikipedia you dumba—“
quantumwoke•30m ago
It's crazy to me that somewhere along the way we lost physical media as a reference point. Journals and YouTube can be good sources of information, but unless heavily confined to high quality information current AI is not able to judge citation quality to come up with good recommendations. The synthesis of real world medical experience is often collated in medical textbooks and yet AI doesn't cite them nearly as much as it should.
jeffbee•13m ago
The vast majority of journal articles are not available freely to the public. A second problem is that the business of scientific journals has destroyed itself by massive proliferation of lower quality journals with misleading names, slapdash peer review, and the crisis of quiet retractions.
gumboshoes•20m ago
I have permanent prompts in Gemini settings to tell it to never include videos in its answers. Never ever for any reason. Yet of course it always does. Even if I trusted any of the video authors or material - and I don't know them so how can I trust them? - I still don't watch a video that could be text I could read in one-tenth of the time. Text is superior to video 99% of the time in my experience.
jeffbee•15m ago
That's interesting ... why would you want to wall off and ignore what is undoubtedly one of the largest repositories of knowledge (and trivia and ignorance, but also knowledge) ever assembled? The idea that a person can read and understand an article faster than they can watch a video with the same level of comprehension does not, to me, seem obviously true. If it were true there would be no role for things like university lecturers. Everyone would just read the text.
ffsm8•7m ago
YouTube has almost no original knowledge.

Most of the "educational" and documentation style content there is usually "just" gathered together from other sources, occasionally with links back to the original sources in the descriptions.

I'm not trying to be dismissive of the platform, it's just inherently catered towards summarizing results for entertainment, not for clarity or correctness.

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