The reason for many of these pollutants is that nappies are made from cellulose, which comes from plants, which may have been grown in polluted areas themselves Most of the others were perfume componentspic.twitter.com/8MecMWk63R
Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him
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The reason for many of these pollutants is that nappies are made from cellulose, which comes from plants, which may have been grown in polluted areas themselves Most of the others were perfume componentspic.twitter.com/8MecMWk63R
The report then estimates, with some very complex modelling, how much of these pollutants babies might be exposed to over the course of ~4,000 nappies used in their lifetimes
Without going into too much detail, the margins of error for these estimates are VERY HIGH. It's entirely possible that babies absorb far less (or far more) than the estimates
They then compare the worst-case scenario estimates - the highest end of their wide confidence interval - with reference doses for these pollutants Reference dose = dose at which toxicity is likely/possible for a specific chemical
And guess what? GLYPHOSATE WAS SAFE. IT WASN'T ONE OF THE PROBLEMATIC POLLUTANTS (green = lower maximum estimated exposure than reference dose over lifetime)pic.twitter.com/3OaRwnXX5B
There were, however, plenty of pollutants that were higher - many of them only by tiny amounts - than the reference doses That's ~potentially~ an issue
The report then goes on to recommend that the substances be removed from nappies This is a fair recommendation, because although there's no evidence that they are harmful in these doses for this exposure, babies are very vulnerable and we want to be carefulpic.twitter.com/LSYZA5MGsc
Wow, that thread went on for far longer than I was expecting. Take-homes: 1. These exposures probably aren't harmful 2. They are in ~tiny~ doses, even across 4,000+ nappies 3. BUT we are careful where infants are concerned 4. This doesn't mean you should worry
All that being said, it's worth noting how truly absurd it is that a report that found that glyphosate WASN'T AN ISSUE is being reported on as an indication that we should be scared of nappies because glyphosate
Assuming a nappy has glyphosate at the limit of detection, and assuming all of the glyphosate is leach able from cotton (it is not) and given that skin absorbs about 1% of glyphosate babies would be exposed to 15 NG of glyphosate per nappy so far below TDI it's not funny 2/2
That's basically what they found! There is even a table of results that didn't show a risk in any scenario that they were tested in which includes glyphosate!pic.twitter.com/F6Azn5xFJQ
To be fair on the dose that they report, they modelled the glyphosate exposure based on a 0.46% absorption from the amount that they dissolved in their tests, but over 4,000 nappies across years of use, rather than the single-use exposure, then used the highest estimate
I don't think that this is unfair, because safety studies of this type are almost always extremely conservative, due to the very wide margins of error on the estimates
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