A question I had was whether a completely plant based diet avoid ingestion of microplastics, as most articles I see are focused on the aquatic ecosystem (probably because the density of pollution in our seas is arguably more than terrestrial). A quick google search turns up a lot of articles on the deleterious effect on plants as well, so I guess there is no escape. But perhaps (hopefully) a plant based (e.g. PBHF) diet can mitigate some of the risks imminent on a meat (mainly seafood?) based diet.
Economic use of post-treated sewage includes both greywater and sludge. Both are therefore presented to plants either in the root system or over green leaf material.
I would argue its tiny amounts, and far less likely to be concentrated the way mercury is in apex predator fish (tuna, swordfish) -But it would be wrong to assume veg-heavy diet automatically removes some risk of ingested plastics, if they are micro sized, soluable, and can be taken up in transpiration or by absorption due to contact.
I'm not wanting to oversell this: I think the plastics risk in food has been overstated for many people. Its a warning story about a risk side issue which has some extreme outliers. One survey I reviewed here after another HN story discussed Indian veg around a plastics factory which had a fire. I can assure you thats not normal agriculture practice, we don't routinely worldwide burn BPA containing plastic feedstock over our plants.
