Plant based diet is being pushed by practically everyone, with the claims that it's better for the environment, better for your health, blah,blah,blah.

[sarcasm]
How in the world did humanity survive before we were told exactly how we should eat?

For eons, there was no one telling them that they needed 35 g of fiber daily. They had no one telling them to eat a rainbow of a dozen servings of different colored vegetables and fruits each day. No one even told them they'd suffer less depression if they ate at least 415 g of fruits and vegetables daily!!!

They didn't have anyone showing them colorful pyramid diagrams that explained how to prioritize the types of foods they ate, and how many servings of each food they needed each day. They didn't have anyone giving them a plate that showed exactly how much of the plate should be taken up by exactly which types of food!

Oh, the poor humans -they had no one telling them that all animal products were deadly, especially animal fats, to be avoided at all costs.

Pollution was obviously at deadly levels before we learned that it's cow farts that cause all the pollution! Oh, the poor people who didn't know these things, and persisted in eating eggs, meat -and worst of all BUTTER and BACON anyway!

Even our grandparents were so sickly that nearly everyone died young due to insufficient legumes, polyunsaturated vegetable oils, plant based "milks", and leafy greens in their diets every single day, and those few who somehow survived through puberty, in spite of the animal products in their diets - well, they obviously suffered insurmountable infertility, leading to the decimation of the population worldwide, so that none of us were ever born.

[/sarcasm]

Yeah, not exactly the way things happened, is it?

It defies logic to even begin to believe that somehow in the last 50 years, the very foods that were the mainstays of the human diet suddenly became deadly to humans, and the foods that were only eaten when readily available in season, or were survival foods during times of famine should actually be the mainstays of our diet.