Do you literally believe no epidemiological study of the effects of plastics on human health has occurred?
The question was about plastic pollution, and specifically the effect of micro plastic particulates on humans. I couldn't find anything after a cursory search, although to be honest I don't really know what terms I should be searching for.
Googling epidemiological study of the effects of plastics on human health is a decent place to start.
Asking about it here on hn is very definitely not.