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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
Verified account
@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. Health Nerd‏Verified account @GidMK 12 Nov 2019

      In other words, the PRIMARY FINDINGS of this research project is that drinking more/less water DOESN'T IMPACT CHILDREN'S PERFORMANCE ON COGNITIVE TASKS That's the exact opposite of what the media reportedpic.twitter.com/uaa7gSlEpu

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    2. Health Nerd‏Verified account @GidMK 12 Nov 2019

      What they DID find, and what was then converted into the headlines, was that if you look WITHIN GROUPS, there were some statistically significant trends, where better urine markers of hydration led to better accuracy on the testspic.twitter.com/8m5mwUGbVF

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    3. Health Nerd‏Verified account @GidMK 12 Nov 2019

      I.e. if you look just at kids when they were in the AL condition (drinking as much water as they wanted), those who had more concentrated urine appeared to be slightly less accurate on some cognitive tests

      1 reply 0 retweets 1 like
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    4. Health Nerd‏Verified account @GidMK 12 Nov 2019

      But remember - there was no difference between conditions In other words, perhaps dehydration affects cognition, but drinking more/less water doesn't appear to make any difference

      1 reply 1 retweet 4 likes
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    5. Health Nerd‏Verified account @GidMK 12 Nov 2019

      Here's the main table of results As you can see, there are really very few differences between the three groups on any test for reaction time or accuracypic.twitter.com/jdzJ4do8AH

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    6. Health Nerd‏Verified account @GidMK 12 Nov 2019

      Moreover, it's very hard to tell if the statistical tests were controlled for multiple comparisons, which is concerning because many of the p-values were between 0.03-0.05pic.twitter.com/kCMktXnc3t

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    7. Health Nerd‏Verified account @GidMK 12 Nov 2019

      And, reminder, this was an industry-funded trial, which makes the reporting of the apparently negative findings even more worrying

      1 reply 0 retweets 1 like
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    8. Health Nerd‏Verified account @GidMK 12 Nov 2019

      Also worth noting that the study didn't really look at multitasking per se, this was based on an extrapolation from the within-group tests that looked at cognitive load!

      1 reply 0 retweets 0 likes
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    9. Health Nerd‏Verified account @GidMK 12 Nov 2019

      TO RECAP: - industry-funded trial - potential issues with study design - strange numbers - results NEGATIVE for primary outcome - didn't look at multitasking - somehow still reported as "water helps multitasking"

      1 reply 0 retweets 1 like
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    10. Health Nerd‏Verified account @GidMK 12 Nov 2019

      P.S. I forgot to mention that I don't think you can call a trial measuring low water intake to high water intake a trial of water It's a trial of dehydrationpic.twitter.com/g6Hv4gyR0h

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      Health Nerd‏Verified account @GidMK 12 Nov 2019

      I mean, imagine measuring cognitive ability in people who hadn't eaten in days vs those who'd eaten plenty It's a ridiculous thing to test in the first place!

      7:47 PM - 12 Nov 2019
      • 3 Likes
      • Maie Lynn Bee, PhD John Baxindine C (she/her) #BlackLivesMatter
      2 replies 0 retweets 3 likes
        1. Bunceptor‏ @blasphemybunny 12 Nov 2019
          Replying to @GidMK

          Um...as I understand it multitasking doesn't exist. Your brain is just switching quickly(or not so quickly) between one task and the other...

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        1. Scott Krugman, MD‏Verified account @Dr_ScottK 13 Nov 2019
          Replying to @GidMK

          How do these studies even get published? Wow.

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