Apparently there is a good chance we are already doing that according to a study commissioned by the World Wide Fund for Nature (WWF) and carried out by the microplastics research team at the University of Newcastle.
The researchers say that water, both bottled and tap, is the largest source of plastic ingestion. Of consumables the highest recorded plastic levels were found in shellfish, beer and salt (?).
News report link here:
https://www.abc.net.au/news/2019-06-12/ ... s/11199498
The next phase of research is around the human health impacts of ingesting plastic.