> This effect was seen even though nanoplastics did not appear to cross the gut barrier

Doesn’t this contradict other studies that show ingested nanoplastic ends up in the organs?

good callout. It could be possible it didn't cross the gut barrier for mice but for humans its different

Notably the authors made additive-free polystyrene particles that were labeled with gold.

On one hand it lets them say what PS particles without additives do, on the other hand, real plastic particles have additives and that is what you're exposed to.

(micro|nano)-plastics are not all the same, additives and morphology make all the difference.