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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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    Health Nerd‏Verified account @GidMK 16 Jan 2020

    A bunch of people have already asked me about this study I have Some Thoughts Many of them are that this is totally ridiculous, drink whatever milk you want ughpic.twitter.com/YuCR9s5NlV

    1:35 PM - 16 Jan 2020
    • 7 Retweets
    • 46 Likes
    • 🐀💔👼 Ryan Pace kelly (under development) Nick Hiebert Darko Stojilović Frederik Dalgaard Brenda Davy, PhD RD Jasam Nitko The_Skeptical_Scientist⚗️💉🔬🔭⚖️
    3 replies 7 retweets 46 likes
      1. New conversation
      2. Health Nerd‏Verified account @GidMK 16 Jan 2020

        So, study is here. It's a cross-sectional epidemiological trial using NHANES data to look at associations between milk fat and telomere length:https://new.hindawi.com/journals/omcl/2019/1574021/ …

        1 reply 0 retweets 0 likes
        Show this thread
      3. Health Nerd‏Verified account @GidMK 16 Jan 2020

        What's that you say? That doesn't sound anything like the headlines? I see you've spotted one of the MASSIVE GLARING ISSUESpic.twitter.com/NL2XpFgPY1

        1 reply 0 retweets 7 likes
        Show this thread
      4. Health Nerd‏Verified account @GidMK 16 Jan 2020

        The study used telomere shortening as a proxy for biological age Basically, shorter telomeres means 'older', because shorter telomeres are associated with aging

        1 reply 0 retweets 0 likes
        Show this thread
      5. Health Nerd‏Verified account @GidMK 16 Jan 2020

        (Telomeres are part of our DNA that stop it from breaking when it replicates. You have less of them as you grow older, which some people think is part of the reason that we get less healthy as we age)pic.twitter.com/6iLjGFhzIh

        1 reply 0 retweets 2 likes
        Show this thread
      6. Health Nerd‏Verified account @GidMK 16 Jan 2020

        FIRST PROBLEM: telomeres are NOT age. They are ASSOCIATED with age In other words, you can't predict much from shorter telomeres. It might just be that they get shorter as we age naturally, rather than causing our aging processes per sepic.twitter.com/9gn5y4Zy1e

        1 reply 0 retweets 5 likes
        Show this thread
      7. Health Nerd‏Verified account @GidMK 16 Jan 2020

        So making any claims about adding years to your life from this research is baldly wrong. The study made some weird extrapolations from shortened telomeres to 4.5 years of aging, but that's not very realistic

        1 reply 0 retweets 3 likes
        Show this thread
      8. Health Nerd‏Verified account @GidMK 16 Jan 2020

        SECOND PROBLEM: The analysis was cross-sectional Basically, the researcher (yes just one) took a sample of people at one point in time and looked at whether full-fat milk was associated with telomere issues

        1 reply 0 retweets 3 likes
        Show this thread
      9. Health Nerd‏Verified account @GidMK 16 Jan 2020

        This is a problem, because we haven't measured people over time All we can say is that, in the NHANES sample from 1999-2002, people with shorter telomeres drank more full fat milkpic.twitter.com/p5ZowpcOoI

        1 reply 0 retweets 4 likes
        Show this thread
      10. Health Nerd‏Verified account @GidMK 16 Jan 2020

        Which brings us to the THIRD PROBLEM: this study was observational in nature All the analysis did was look at the association between full/low fat milks and telomere length

        1 reply 0 retweets 3 likes
        Show this thread
      11. Health Nerd‏Verified account @GidMK 16 Jan 2020

        The study didn't even control for many covariates. It's not hard to see how your telomere length (a complex measure of DNA) could be influenced by things that this study failed to control for

        4 replies 0 retweets 3 likes
        Show this thread
      12. Health Nerd‏Verified account @GidMK 16 Jan 2020

        For example, it might be that people with sick parents are more likely to drink full fat milk. Having sick parents is associated with telomere issues, so instead of the milk it's the sick parents' fault

        2 replies 0 retweets 1 like
        Show this thread
      13. Health Nerd‏Verified account @GidMK 16 Jan 2020

        Also, the main analysis treated fat % in milk as a linear variable? That's just total nonsense, you can't buy milk (in most places) that has 2.35% fat

        1 reply 0 retweets 5 likes
        Show this thread
      14. Health Nerd‏Verified account @GidMK 16 Jan 2020

        For this study to be correct, people would have to be homogenizing their own milk which is...unlikely

        1 reply 0 retweets 2 likes
        Show this thread
      15. Health Nerd‏Verified account @GidMK 16 Jan 2020

        Anyway, there are more problems but I think that's enough for now You can't really take much away from this study except that adults in 2000 who drank full fat milk might've had slightly shorter telomerespic.twitter.com/LSREjADsty

        1 reply 0 retweets 0 likes
        Show this thread
      16. Health Nerd‏Verified account @GidMK 16 Jan 2020

        TL:DR - drinking skimmed milk can't "add 4.5 years to your life" - the study had nothing to do with age - probably not causal - DRINK WHATEVER MILK YOU WANT

        1 reply 3 retweets 16 likes
        Show this thread
      17. Health Nerd‏Verified account @GidMK 16 Jan 2020

        Health Nerd Retweeted Health Nerd

        Oh, forgot to mention that if this regression was accurate you'd expect that people who eat cheese, which has a very high percentage of milk fat, would have basically no telomereshttps://twitter.com/GidMK/status/1217927165884321792?s=20 …

        Health Nerd added,

        Health NerdVerified account @GidMK
        Also, the main analysis treated fat % in milk as a linear variable? That's just total nonsense, you can't buy milk (in most places) that has 2.35% fat
        Show this thread
        0 replies 1 retweet 10 likes
        Show this thread
      18. End of conversation

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