> How do you know which plastics
This is regulated by the FDA. See [1] for a link to their hub which goes into far more detail. Obviously a restaurant can violate the regulation, just as they can slip glass shards into your food or not wear gloves.
> Just because it's common or "natural" doesn't mean it's not bad for you
You're correct in this regard at large, see Sharks, Lions and Bears. However nitrates (especially sodium nitrate, not to be confused with potassium nitrate) have been used for a very very very long time in human history for preserving meat. The guardian article is extremely disappointing in that it makes no reference to published material and seems to make several bad claims, including to the reference of salting meat as an "alternative". That being said like all chemicals too much of it will cause adverse side effects, and there are people with genuine reasons (migraines) who want to watch their consumption of it.
> This sort of snark is really not welcome on HN
I'm mostly surprised to see blatantly conspiracy theorist level "there's fluoride in the water man!" kind of nonsense here. It's one thing to discuss your favorite nitrate-free red wine or have a preference on bacon, it's another to suggest that flouridated tap water is a negative.
There was recently a town near me, in Texas, that voted to de-flouridate their water supply. This kind of non-logical fear is backed by comments like this that suggest anything with a vaguely scientific name is bad for you or should be avoided.
We have already seen this happen with vaccines and already kids have died from measles - MEASLES. A disease that should never pop up again in the industrialized world. We shouldn't be wasting resources to convince educated adults in a first world country to get their vaccines, we should be helping to bring life saving basic medicine to everyone.
So yes, that was snarky and sharp. However I don't think it's okay to spew blatantly alarmist non-scientific nonsense and pretend it's "just an opinion". (And sorry for the rather long rant.)
[1] - https://www.fda.gov/Food/IngredientsPackagingLabeling/Packag...