Weirdly, as a scientist by training, I am quite unscientific when it comes to these kinds of things. Nature is exquisitely subtle and it can be really hard to "

Weirdly, as a scientist by training, I am quite unscientific when it comes to these kinds of things. Nature is exquisitely subtle and it can be really hard to "measure" these things when you may not even know what to measure for. That said, I know full well that physiological chemistry can be sensitive with reaped to down isotopic distributions due to competing kinetic pathways, even though isotopes are supposed to "behave the same". Meanwhile, we're just about realizing that gut fauna can influence a bunch of stuff that ought to be "orthogonal". So when it comes to wide scale exposure to things like this I typically keep an open mind because biology is crazy complex and most our models are woefully simplistic. In any case global spread of microplastics can't really be good...