Define "just fine". PLA microplastics can have strongly hormonal effects. In european perch, for example, they were even found to significantly alter social behavior.[0] MPs can cause tissue damage, oxidative stress, and changes in immune-related gene expression as well as antioxidant status in fish[1] and humans may experience oxidative stress, cytotoxicity, neurotoxicity, immune system disruption, and transfer of MPs to other tissues after being exposed to them.[1][2]
Define "just fine". PLA microplastics can have strongly hormonal effects. In european perch, for example, they were even found to significantly alter social behavior.[0] MPs can cause tissue damage, oxidative stress, and changes in immune-related gene expression as well as antioxidant status in fish[1] and humans may experience oxidative stress, cytotoxicity, neurotoxicity, immune system disruption, and transfer of MPs to other tissues after being exposed to them.[1][2]
[0] https://www.sciencedirect.com/science/article/pii/S004896972...
[1] https://www.frontiersin.org/articles/10.3389/fenvs.2022.8272...
[2] https://www.undp.org/kosovo/blog/microplastics-human-health-...