People are critters of habit.
With very few exceptions simply getting enough calories from whole foods ensures enough protein and enough essential amino acids, but throughout history famine was a recurring thing. In starving times a food that is high in fat and high in "high quality" (human flesh-like) meat protein is a god send for maintaining people until the famine ends. But being critters of habit people keep eating those 'famine foods' on into the good times.
Menudo is a great example, in a mexican famine people were so hungry they resorted to eating stomachs, intestines, and brains soup. Now its a traditional dish and recommended as a hangover cure (they used to use cactus flowers for hangovers).
Up north, in starving times people got so hungry they would eat reindeer vomit. Yes, rudolf the red nosed vomit. It became a traditional ethnic food.
In my dads youth his family of nine could often only afford two eggs, so they boiled the poison out of a local poisonous weed that no one cared if the poor harvested and scrambled their two eggs up in that. Poke salat, originally a thing of the desperately poor, its an 'ethnic food' now.
Our respective cultures have their foodways based on old habits and traditions from many different reasons.
People like to defend their (past) 'culture' but cultures are in continuous flux, they cant be held static, so eliminating old bad or obsolete habits should be ok. It could even be a sign of maturity.
People are also vain critters.
Meat used to be symbolic of luxury so people like to be seen eating meat, and they like to see themselves eating meat. It can be a thing of pure conceit. Not consuming to absurd excess could also be a sign of maturity.
As for historic foodways we mostly only have written records from the wealthy. People like to point out that written cookbooks for the pharoes involved loads of meat and the 'ancient egyptians' were healthy and strong and built pyramids... of course, they ignore the fact that the pharoes who were wealthy enough to eat meat every day were riddled with heart disease.
One interesting exception to the lack of information on normal peoples diet was Marcus Porcius Cato's book on farming. Cato, an ancient roman, basically wrote a guide on how to start and manage a farm. It included a passage on what, and how much, to feed the different workers.
Quote:
(LVI) The following are the customary allowances for food: For the hands, four pecks of meal for the winter, and four and one-half for the summer. For the overseer, the housekeeper, the wagoner, the shepherd, three pecks each. For the slaves, four pounds of bread for the winter, but when they begin to cultivate the vines this is increased to five pounds until the figs are ripe, then return to four
Thats it for feeding farm workers. Grain. The romans, like the greeks, just went out and harvested edible herbs and wild veggies as needed but they had to grow or be paid in grain (meal).
In other historical accounts roman soldiers would complain when they were fed meat because it made them slow and weak. Grains and wild herbs propelled the roman army across europe.
Another historically interesting source is the original buddhist suttas. For fourty years (about 2550 years ago) the buddha wandered around teaching. The suttas are the events and teachings of those times, theres a lot of them! People of all classes would give him food to eat, he would teach people in terms familiar to their lives, and he'd just wander around and encounter ordinary stuff. In all the surviving records of that he was mentioned as eating meat one time, meat with jujubes (like a cross between an apple and a date, theyre good). Elsewhere in other suttas there is food all over the place, usually either vegan or lacto-vegetarian with honey. Buffalo boys were described tending dairy cows and once a butcher was described cutting up a cow at a crossroads but when people ate it was things like steamed barley and rice, vegetables and rice, vegetables and bread, etc. and when a young girl mistook the buddha for a tree spirit (its india) she gave him a offering of milk-rice porridge, food prepared for the gods.
The buddhists also encountered the Jains, who were around at the same time. They were like the monks and nuns of ethical veganism! Not only did they strain any macroscopic living creature out of water they were collecting to drink like the buddhists did but they wore masks to keep from breathing in little flies and they carried delicate brooms to sweep insects off walking paths.
Naturally there are lots of historical records of meat eating, but vegetarianism and even veganism is as old as recorded history.
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