to expand, meat eating on a regular basis is an extremely recent thing
it is in no way "the natural order of things"
only rich people would eat meat more than ~ once per month at best
i mean, people would eat eggs and milk all the time. same with fish. idk what culture youre referring to here, even inland places in europe had people fishing all the time. like 10 hens can produce so many eggs you dont know what to do with them. and a decently large flock of sheep has enough of them dropping dead naturally that you can eat sheep for a whole month (people really underestimate how much meat is on a whole ass sheep or cow, that can last one family a loooong time).
in fact populations in europe that didnt eat fish regularly would thin out and die off because vitamin d was in a very short supply during the little ice age and the actual ice age (around the time light skin developed 20-50k years ago, this was a very strong selection pressure). without proper levels of vitamin d you end up being unable to carry babies.
It seems like people think "oh, they only ate roughly one American meal's worth of meat a week/month? Must have been all at once as a treat then," instead of the more likely case of an ounce or two a day going into a family's boiled grain slop or stew to flesh it out and make it more palatable, tallow finding its way into various things, marrow ending up in stocks, etc. It's the quantity and role of meat in American diets that's just a "within the last century" sort of development, not its presence at all.
Like people weren't going and getting a double cheeseburger with a week's wages once a month, they were getting (or rationing) a half pound of salted pork or beef or sausage once a week/month and using it as an ingredient in other dishes.
perpetual stews were really common back in the day for sure
also like i said, its pretty trivial even now to go fishing for food despite the massive reduction in marine life. especially in northern europe, it was very common to eat fish all the time. we also know the inuits had an almost purely seal, whale, berries, and fish diet. plains tribes also had pretty high meat diets.
idk, i just think its revisionist to act like high meat intake is a new thing. plenty of historical conditions made high meat intake the only way to do things. obviously eating such high amounts of beef cant be good for you, but its not like people lived particularly long in the eras we're talking about (though if you lived past 40 odds are youd live to semi-normal life expectancy these days), so that wouldnt catch up with them.
but it's still very telling that when you give people enough money land and wealth, many of them start eating more meat, while very few of them start eating less. Chinese people rocketed their meat consumption over the last 30 years, and I really don't think anyone was propagandizing them to do so
obviously not the obscene American pounds of meat a day, but maybe 4 oz of total animal flesh per day would be a reasonable standard.
There's also a very telling trend in India where all the vegetarian states just happen to consume more dairy and have a high rate of lactase persistence compared to the meat/fish eating states