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Researching this it seems like PLA is also common. "Plastic" is a super vague term, and it seems like non-petroleum plastics are the norm for this application. One benefit is that these types of plastics readily biodegrade into lactic acid (which naturally occurs in many foods). From a health standpoint it seems like they could be safer than some petroleum based plastics. Would be interested to learn more from someone who knows this area better.

https://en.wikipedia.org/wiki/Polylactic_acid

So what? Doesn't mean we're expelling them. They could all be settling somewhere in our gut until one day we complain of an ache and find out we have a plastic tumor in us. Ending up like so many sea creatures dying from ingesting too much plastic.

See comment above..

alexandercrohde 4 hours ago

Commentary published in Environmental Health Perspectives in April 2010 suggested that PET might yield endocrine disruptors under conditions of common use and recommended research on this topic.[26]