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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. Health Nerd‏Verified account @GidMK 21 May 2019

      Health Nerd Retweeted

      Do blue light filters help with sleep? This is a pretty complex question, so let's break it down a little 1/ https://t.co/DPPeLGvpqI 

      Health Nerd added,

      This Tweet is unavailable.
      3 replies 10 retweets 34 likes
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    2. Health Nerd‏Verified account @GidMK 21 May 2019

      What is blue light and why might it be a problem? 2/pic.twitter.com/h3IRqYPWJj

      1 reply 0 retweets 0 likes
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    3. Health Nerd‏Verified account @GidMK 21 May 2019

      Blue light is exactly what it sounds like, light that is blue, with a wavelength of about 450-495 nanometers 3/pic.twitter.com/wYZGqUxYDQ

      1 reply 0 retweets 0 likes
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    4. Health Nerd‏Verified account @GidMK 21 May 2019

      The basic idea behind blue light being bad for us is that we evolved to live with the only source of light: the sun This means that our biological clocks are geared towards the sun's rhythms 4/pic.twitter.com/ciYhEgKUWL

      1 reply 0 retweets 0 likes
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    5. Health Nerd‏Verified account @GidMK 21 May 2019

      A number of studies have shown that various aspects of our biology are changed depending on whether we are exposed to sunlight, and at different points in the day 5/

      1 reply 0 retweets 0 likes
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    6. Health Nerd‏Verified account @GidMK 21 May 2019

      In particular, it seems that a specific set of wavelengths - blue light - can impact our sleep regulatory hormones and potentially change how we sleep 6/pic.twitter.com/62SMjcD5cs

      1 reply 0 retweets 0 likes
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      Health Nerd‏Verified account @GidMK 21 May 2019

      And furthermore, these wavelengths are emitted quite a bit by smartphones and other devices, partly because they are pretty bright and allow us to see better in the dark 7/

      3:52 PM - 21 May 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 21 May 2019

          So, blue light at night sounds like the enemy! It's unnatural, and might impact our hormones. This sounds scary 8/pic.twitter.com/etj7BR6yi5

          1 reply 0 retweets 0 likes
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        3. Health Nerd‏Verified account @GidMK 21 May 2019

          BUT There are some issues here 9/

          1 reply 0 retweets 0 likes
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        4. Health Nerd‏Verified account @GidMK 21 May 2019

          Firstly, the relationship between blue light and poor health isn't as solid as it's often made out to be If you look at this systematic review, many of the studies have been conducted on 10 people or fewer!https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1527773 …

          1 reply 2 retweets 4 likes
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        5. Health Nerd‏Verified account @GidMK 21 May 2019

          And while most of the research shows some STATISTICALLY significant changes to things like melatonin and brainwaves, the evidence is much less solid for CLINICALLY significant changes 11/

          1 reply 0 retweets 1 like
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        6. Health Nerd‏Verified account @GidMK 21 May 2019

          The problem is that there just isn't a lot of research, outside of large epidemiological trials, that have managed to get enough people to say definitively whether there are actually health problems associated with blue light 12/

          1 reply 0 retweets 1 like
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        7. Health Nerd‏Verified account @GidMK 21 May 2019

          It's also not obvious how long these changes to melatonin last. The systematic review I mentioned earlier found that they may be very transient, lasting only 15 mins How much does that impact your health? We just don't really know 🤷‍♂️ 13/pic.twitter.com/K9IyuT6hzA

          2 replies 0 retweets 2 likes
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        8. Health Nerd‏Verified account @GidMK 21 May 2019

          So what about all the blue light blockers? Well, there are plenty of studies on those too The problem is that they're mostly not very good 14/

          1 reply 0 retweets 1 like
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        9. Health Nerd‏Verified account @GidMK 21 May 2019

          For example, this recent study took 14 people, and gave half blue light filtering glasses and the other half normal glasses They found some barely significant differences (p=0.035-0.049) It's not enormously convincing stuff 15/ https://www.sciencedirect.com/science/article/pii/S0022395617308592 …

          1 reply 0 retweets 1 like
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        10. Health Nerd‏Verified account @GidMK 21 May 2019

          A 2017 systematic review could not identify a single study (!) of appropriate length and duration to make any statements about blue light blockers either way 16/pic.twitter.com/YzcjziwUvC

          1 reply 2 retweets 3 likes
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        11. Health Nerd‏Verified account @GidMK 21 May 2019

          Do blue light glasses work? Currently, best evidence suggests they probably don't do that much, but the best evidence is really not good 17/pic.twitter.com/qD4NoAcWNr

          1 reply 0 retweets 1 like
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        12. Health Nerd‏Verified account @GidMK 21 May 2019

          To sum up: - Blue light might be bad - We aren't sure, it might not be - Blocking blue light might help - It also might be a total waste of time 18/pic.twitter.com/9OwkhF122S

          1 reply 0 retweets 7 likes
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        13. Health Nerd‏Verified account @GidMK 21 May 2019

          Best bet seems to be that blue light blocking software/glasses might improve your sleep a little, but it's hard to know if there's a real benefit to your health there 19/

          1 reply 0 retweets 1 like
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        14. Health Nerd‏Verified account @GidMK 21 May 2019

          This is particularly true given that many of the studies are unblinded and rely on self-reported symptoms, which makes them MUCH less reliable as evidence 20/

          3 replies 0 retweets 3 likes
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        15. Health Nerd‏Verified account @GidMK 22 May 2019

          Podcast now out on this topic and recent headlineshttps://soundcloud.com/senscipod/episode-7-blue-light-glasses …

          0 replies 0 retweets 1 like
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        16. End of conversation

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