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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
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@GidMK

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Health NerdVerified account

@GidMK

Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him

Sydney, New South Wales
theguardian.com/profile/gideon…
Joined November 2015

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    1. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      1/ These ads have been appearing in London courtesy of Cancer Research UK. The first thing that struck me was that advertising regulations mean they have to be truthful, hence the word “remember” appears.pic.twitter.com/DdePdL9KXn

      4 replies 7 retweets 21 likes
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    2. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      2/ Recall bias is a massive problem with these studies. People who consume a product are more likely to recall seeing ads for it. Campaigners prefer to just say “people who see ads for x consume more of x”. The word “remember” is important for the ad to be truthful.

      2 replies 2 retweets 9 likes
      Show this thread
    3. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      3/ Alas, the media don’t have to play by advertising rules. The Daily Mail’s headline reporting this study is quite typical.pic.twitter.com/pTS2dhCSMr

      1 reply 1 retweet 4 likes
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    4. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      4/ Cancer Research themselves are not much better. In their material they say: “Seeing just one extra broadcast advert per week predicted a large amount of HFSS eating...” https://www.cancerresearchuk.org/sites/default/files/executive_summary_v1.pdf …

      1 reply 1 retweet 5 likes
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    5. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      5/ Still, at least that document talks about HFSS (high in fat, sugar or salt) unlike their tube ads which use the legally meaningless term “junk food”. HFSS is a far broader category than what most people think of as junk food. The ads are misleading. https://health.spectator.co.uk/the-proposed-junk-food-ban-is-aimed-at-you-not-your-children/ …

      1 reply 1 retweet 3 likes
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    6. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      6/ But what about the claim that seeing an extra “junk food” ad leads to kids eating an extra 18,000 calories per year? This news was reported exclusively in The Grocer last March.https://www.thegrocer.co.uk/buying-and-supplying/health/hfss-food-ads-mean-teens-eating-18000-extra-calories-a-year/564254.article …

      1 reply 1 retweet 3 likes
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    7. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      7/ It claimed that kids see 6 such ads per week and that those who see 7 per week consume an extra 350 calories a week. A striking and specific claim. Was there a linear relationship? How much did those who recall no ads eat?pic.twitter.com/rE9jdpfgio

      1 reply 1 retweet 3 likes
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    8. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      8/ Alas, the study was unpublished at the time so we couldn’t assess it. The rest of the media reported it in May when the findings were due to be presented by lead author Jyotsna Vohra at the European Congress on Obesityhttps://metro.co.uk/2018/05/22/junk-food-adverts-are-fuelling-teenage-obesity-according-to-new-research-7567483/?ito=cbshare …

      1 reply 1 retweet 2 likes
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    9. Christopher Snowdon‏Verified account @cjsnowdon 16 Jan 2019

      9/ And now it’s all over London, but where is the study? There’s nothing about it on PubMed under the lead author’s name. https://www.ncbi.nlm.nih.gov/pubmed/?term=Jyotsna+Vohra …pic.twitter.com/Gkh5ls4y0U

      2 replies 1 retweet 2 likes
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    10. Health Nerd‏Verified account @GidMK 16 Jan 2019
      Replying to @cjsnowdon

      To be fair here, they did publish the whole study themselves publicly, which is not unusual for NGOs who conduct their own research: https://www.cancerresearchuk.org/sites/default/files/under_pressure.pdf …

      2 replies 0 retweets 0 likes
      Health Nerd‏Verified account @GidMK 16 Jan 2019
      Replying to @GidMK @cjsnowdon

      That being said, their conclusions are far too solid for the research that was conducted. It's a very complicated inference model, definitely not something you can put that much confidence in

      1:38 PM - 16 Jan 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 16 Jan 2019
          Replying to @GidMK @cjsnowdon

          They basically took self-reported advertising exposure, converted into a linear scale, then did the same with self-reported HFSS foods, and used linear regression to estimate the increased consumption

          1 reply 0 retweets 0 likes
        3. Health Nerd‏Verified account @GidMK 16 Jan 2019
          Replying to @GidMK @cjsnowdon

          Then they converted the increased consumption to an estimated calorie intake, based on previous literature, and used that as their final estimate. That's a lot of steps where something could've gone wrong

          1 reply 0 retweets 0 likes
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