are you really plastic free ,have you ever thought about it , maybe you ate a fish that had had eaten plastic (Microparticles of plastic inside of the fish ). 

https://www.independent.co.uk/environment/plastic-microparticles-fish-flesh-eaten-humans-food-chain-mackerel-anchovy-mullet-a7860726.html

if you keep using plastic , we maybe not aware of it's harm but later it will come for us and kill us .