Like, I'm pretty strictly Paleo, which means heavy on the whole foods, heavy on the real ingredients from organic and safe sources, local if possible, the only major difference between us should be just that I eat meat and you don't.
Reason I say this is, I know vegans out there who eat fake food because its vegan... but its still fake food. If you are one of the vegans that eats like me, people like us should be avoiding most of the plastic in the diet just by our choices in where the food comes from.
You can't escape it due to the whole "biodegradable/recyclable plastic will save the world" bullshit movement (which is where most of the microplastic is coming from, sadly), but we should be avoiding most of it.