Since it’s related: ketchup (the word, not necessarily the sauce) has a historical origin in China. It would have been a fermented fish sauce rather than a tomato based sauce.

This is about right. Teflon (PTFE) itself is mostly harmless to humans because you aren’t likely to consume large enough amounts or small enough particles of Teflon for it to enter your bloodstream.

Other PFAS like PFOA, PFOS, PFHXS, and PFNA, which are the kind you would find used to coat the inside of a popcorn bag to keep the butter off the bag, are commonly found in human blood and have been linked to negative health outcomes in humans.