tldr, not much because we can't measure it to begin with

did read, >e360: Do we really eat a credit card’s worth of plastic each week? >Rauert: That has absolutely been debunked

and >...we found is that lipids and fats will give you a false positive for polyethylene. Lipids are made up of the same building blocks as polyethylene, so when we analyze them, they look identical in our analysis instrument. >I know it is easy to say we don’t have enough information yet, but we do know about [the health risks from] these chemicals that are in all the plastics that your food is wrapped in.

Not just because we can't measure it but because its hard to say what's due to the plastic and what's due to additives in the plastics

> And while we know a lot about the impact of chemicals added to plastic — such as phthalates, which have been shown to impact fertility, or bisphenols, which have been linked to Type 2 diabetes — we know very little about what effect the plastic particles themselves might be having.