[mythrwy]

Do I consume drinks? No, except water and instant coffee, no soda, no beer. Meat? Yes in small quantities and much of it comes from the local environment. I grow most of my own produce, with RO water.

Yes they are unavoidable, just the plastic containers etc probably give some and I do eat candies and imported bananas and bread etc. But pretty sure I get a lot lower dose than most people.

However I'm not sure it matters that much until a mechanism of actual damage is established.

[_yb2s]

> I grow most of my own produce, with RO water

Do you really grow enough food to make up most of your diet on RO water? And is this specifically to avoid microplastic exposure, or what?

[mythrwy]

I grow around 1/3 of my own food. Yes all with RO water. I'd like to get above 50%.

Specifically produce, however we grow most of what we eat. We pressure can, dehydrate and ferment to preserve. I have background and decades of experience in growing, which is to say it's more than just standard hobby garden level.

The RO water is not to avoid microplastics (although that might a side benefit) but rather that the water is highly mineralized. It would be a long post to explain why I do this. Some is theoretical health concerns, some is more practical.

[timeon]

This is really interesting. Do you have suggestions how to use RO in garden scale? (Like link where could I start)

[mythrwy]

I built my own RO system it cost around $1500 including a water softener. There are some ongoing supplies every year, maybe $200 or less.

I don't have any links I just figured it out, but it's not super complicated. I made it out of undersink RO membrane housings (housings from those little RO systems you can buy for around $300 that do a couple of gallons a day). The membranes have pressure pumps in front of them that get it up to a couple hundred gallons RO water total a day.

Basic steps are 1) Soften the water, 2) Pass it through very tight filters (like 1 micron), I also carbon filter for organic contaminants, 3) Booster pumps put water through osmosis membranes and from there into a storage tank.

I just used plastic totes with gravel in the bottom to house the membranes and booster pumps.

I should write up a blog post on it one day because professionally installed osmosis can be expensive.

[timeon]

Thanks!

[_yb2s]

Interesting, thanks!

[raddan]

> However I'm not sure it matters that much until a mechanism of actual damage is established.

This is the thing about all the microplastics articles I see popping up: they rarely include any description of harm. If they even mention it, it is only speculative, as in this article. Until I read a scientific article about real harms, I am going to regard most of the microplastics news as fearmongering. Humanity has been surrounded by vast quantities of plastic for decades; if there was a big effect, wouldn’t we have seen it by now? If it has big effects, those effects would be surprising, which means that the evidence would have to be strong. I don’t see a lot of strong evidence.

If anyone reading this has a paper like this, please share.

[mrguyorama]

There is no strong evidence of anything yet, but consider how long it took to "prove" to society's satisfaction that cigarettes are harmful, despite most scientists finding the lung cancer connection quite clear from pretty early. Comprehensive and long term data takes a long time. It could be worth it to be cautious in the meantime.

If microplastics are making our lives 10% worse in some dimension, we will have to stumble onto what that dimension would be basically by luck and then spend at least a decade rigorously studying it before we could make useful assertions.

The hubub about microplastics is that, we don't have great civilization wide health data on most health dimensions, so we don't even have good baselines to figure whether we have regressed in many ways. IF there is a negative effect, it will effect everyone all over the planet and there is no escape

It's an extreme corner of the likelihood/amount of harm graph, and some people think that corner of the graph warrants caution even before harm is proven.

It's the same situation we faced with leaded gasoline, and the US is pretty bad when it comes to those kinds of "mild, diffuse harm that mostly affects people who can't afford whatever system the wealthy use to avoid the harm" problems.

It's not fearmongering, we are literally gambling that microplastics have minimal harm right now.

[albertsondev]

That is perhaps the most insidious property of all when it comes to microplastics--it's incredibly difficult to work that out.

We don't have control groups, they're found in virtually every complex organism on Earth, including (best we can tell) all humans, so we can't form a control group. We've only recently really started to notice, care, or study them, so we don't have strong historical data to compare against. We don't have many isolated populations (especially of large enough size) where microplastic bioaccumulation is the only major difference in how their lives have changed in biologically relevant ways over the decades, so we can't effectively isolate the effects of microplastics from other confounding factors.

So you have these things that basically became completely ubiquitous--an unavoidable fact of not just human life, but all complex life on Earth--before anyone realized, with several other major global factors shifting concurrently. The end result is that, by the tools and methods with which we perform science, it's nearly impossible to study their exact effects. Maybe they're a slow-burning apocalypse subtly disrupting the mechanisms of life at their most fundamental levels and only getting worse with time, or maybe they do nothing or next to nothing like having a glass of sherry with your Sunday brunch once a week, or maybe they're somewhere in that vast, murky expanse in between the two extremes. Hell, there might even be a net benefit somehow. We just plain don't know, and don't know how we could know, so speculation is just about all we've got at present, and without knowing it's really hard to say if the messaging and literature surrounding the subject is aggressively over-alarmist or recklessly under-alarmist. The best we've really got is the simple fact that we notice them now, and thus have the chance to pay close attention, part of which is regularly taking basic measurements like these to try and correlate trends.

About all we do know is that they weren't here before, and "before" encompasses 99.9999% of all life that we know to have ever existed, so it's definitely weird and maybe probably bad.

There's definitely criticism to be had with the broader state of public health and science communication that harm, or at least the understanding that "we have literally no idea what the broader implications of this are but they're maybe probably not good", are considered to be implicit, either due to fallacious appeal to nature or the simple fact that alarmist headlines catch more attention, generating more traffic and revenue, and thus acceptance rates and grant money downstream. Which is, I think, the real core of the issue.