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Some examples off the top of my head:

- Many plastics contain known endocrine disrupters like BPA that have been shown to get into people's bodies and correlate with negative health impacts such as certain cancers, sex organ abnormalities and infertility

- Microplastics can damage cardiovascular tissue and correlate with heart attack, stroke and premature death.

- Microplastics correlate with infertility in men.

- Microplastics absorb heavy metals in the environment and can then transport them into the food chain. Heavy metals of course having many established negative health impacts.

These are just some examples, a quick search should get you many more (along with the sources on the above).