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I recommend the book Breath by James Nestor. A well researched book, in which he makes the case for nasal breathing.

That's not an answer to my question at all. I'm asking about the comments and attitudes that seem to treat mouth breathing as bad and wondering where they come from. I'm (relatively) sure that a book published in 2020 isn't the root cause.

Historically, it feels more like a class thing. A proper, civilized person would keep their mouth closed.

As for the current mouth vs nose and belly vs chest breathing, it really feels like a fad/cult. There seem to be a constant stream of very small "studies" with questionable methodologies with just enough results to warrant further investigation.

It’s been a thing in uk for hundreds of years and because of the internet cultures are merging.

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