[HN Gopher] Effects of tea, catechins and catechin derivatives o...
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Effects of tea, catechins and catechin derivatives on Omicron
subvariants
Author : anigbrowl
Score : 26 points
Date : 2023-10-04 20:10 UTC (2 hours ago)
(HTM) web link (www.nature.com)
(TXT) w3m dump (www.nature.com)
| giantg2 wrote:
| Interesting. I wonder if there's any practical application
| observed in the wild. Like people who drink tea are less likely
| to catch it or something.
| hn_throwaway_99 wrote:
| The abstract appears to be suggesting that this tea
| inactivation might make it less likely for Covid positive
| people to _give it_ to others. Covid is mainly spread through
| saliva (droplets when coughing /speaking), but unless you're
| putting tea up your nose it would seem to not have that much
| protective effect from catching it.
|
| > Healthy volunteers consumed a candy containing green tea or
| black tea, and saliva collected from them immediately after the
| candy consumption significantly decreased BA.1 virus
| infectivity in vitro.
| amluto wrote:
| Or perhaps if you are actively drinking tea and possibly
| rinsing your nose with it, it will protect you from infection
| to a decent degree?
|
| The study is showing a good deal of virus inactivation from
| _the levels of tea that might be present in saliva 0 minutes
| after drinking tea_. But not such an extreme degree of
| inactivation that it seems at all likely that residual levels
| of the active ingredients an hour later would be likely to
| help much.
| iterateAutomate wrote:
| > This work was funded by Japan Science and Technology Agency,
| JPMJTM20Y6, ITO EN, Ltd.
|
| Found in the "Funding" section of the research paper.
|
| > Ito En is the largest green tea distributor in Japan
|
| https://en.wikipedia.org/wiki/Ito_En
|
| Not saying this is enough to invalidate the work of these
| scientists, just food for thought.
| daft_pink wrote:
| we have a vaccine. why are we testing tea against a deadly
| disease?
| Zolde wrote:
| It feels like a little too late. Science has to wait on controls,
| and that is difficult to do with a new disease.
|
| Civilian science/shitposters were promoting tea and catechins
| since early 2020, but such information was classified as
| dangerous misinformation by the authorities fighting an
| "infodemic".
|
| https://justpaste.it/8bq9r
|
| > If smelling not good is a bit of a problem, then raw apples,
| lemons, spinach, lettuce, green tea and chew gum would help a bit
|
| > Significant inactivation of SARS-CoV-2 by a green tea catechin,
| a catechin-derivative and galloylated theaflavins in vitro
|
| > Preferably only tea and not tea extract pills, as the latter
| have a chance to cause liver injury
|
| > results strongly suggest that EGCG, and more remarkably TSA and
| galloylated theaflavins, inactivate the novel coronavirus
|
| > Teas contain Epigallocatechin-gallate (EGCG) which is a zinc
| ionophore that helps your cells to absorb zinc that halts viral
| replication in your cells.
|
| > Antiviral activity of [green tea] and plant juices ([black
| chokeberry (Aronia melanocarpa) juice], [pomegranate (Punica
| granatum) juice]) against SARS-CoV-2 and influenza virus in vitro
|
| > Green tea, muscadine grapes, cacao powder, and dark chocolate -
| able to bind to a particular enzyme, or protease, in the virus
| and stop it reproducing
|
| > To further substantiate the inhibitory activities, extracts
| prepared from [green tea (GT), two muscadine grapes (MG), cacao,
| and dark chocolate (DC)], which are rich in CAG, ECG, GAG, EGCG,
| or/and PB2, were used for inhibitory assay.
| amluto wrote:
| It's not too little too late. It's just too little.
|
| The paper is showing about a 100x reduction in infectivity from
| exposure to saliva collected "0 minutes" after drinking tea.
| That's a very small effect. Compare to, say, penicillin, which
| will kill viruses in the levels present in your blood and
| tissue _hours_ after taking a small pill.
|
| Or, for a different comparison, I don't know of anyone testing
| a handgun against COVID (sorry, xkcd), but pool water and
| presumably chlorinated tap water reduces infectivity by at
| least 1000x in 30 seconds:
|
| https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8480993/
|
| Maybe one could use these compounds in tea as a basis to try to
| develop a useful antiviral drug. But numbers like this don't
| make it look like the pandemic could have been averted by
| telling everyone to drink four cups of tea a day or to
| continuously gargle chlorinated tap water.
|
| (Seriously, I doubt there were evil authorities out there
| trying to get people not to drink lots of tea so they could
| drum or support for mask mandates or quantitative easing or
| whatever other measures seem horrible. This whole concept seems
| utterly absurd. And at least opening a window or using a MERV
| 13 or N95 or better seem like more justifiable public health
| measures than distributing free bottles of iced tea!)
| experimenting wrote:
| Not necessarily evil, but elitist.
|
| Authorities were writing that even multivitimins could be
| dangerous and had no scientific proof against Covid. Mentions
| of turmeric got your Youtube video delisted. It is crazy that
| the information gathered above has to reside on a paste site,
| when 25 years ago anyone would have found it on BBS or
| mailing list. Western medicine is needlessly dismissive of
| natural medicine. They censored wisdom of the crowds.
|
| First masks were made taboo, as they did not work for
| civilians (but in reality they had not enough in stock to
| service health care workers). The flip flop on masks only
| came later. In February it was known that chloroquine, which
| helped for SARS-1, was also likely effective for SARS-2.
| Interesting to see the hitjob on that. Ivermectine in vitro
| studies were only censored, because these were discussed on
| "far-right" sites, not because it did not work (because it
| turned out to help in vivo, but doctors lost license for
| prescribing it anyway).
|
| Let the people, especially black skinned people, take vitamin
| D next time there is a viral pandemic. No need for public
| health info-management. It did more damage than good.
| underdeserver wrote:
| @dang - typo in the title.
| dang wrote:
| Fixed. Thanks!
| underdeserver wrote:
| Ummm. What? Tea inactivates Covid? I had lots of tea when I was
| sick. Didn't do much.
| hn_throwaway_99 wrote:
| That's not what the abstract appears to say. It is arguing that
| tea (specifically green tea or black tea candies) reduced the
| _infectivity_ of people who already had Covid. It didn 't argue
| that tea improved symptoms of people who were already infected.
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