A brave new world where the poor people eat artificial meat and crickets while the rich get to eat cows and chickens.
Meat consumption is how a vast amount of indigenous cultures survived.
I’d recommend the book “Should we eat meat?” by Vaclav Smil for a very thorough dive into this topic.
Or, you know, vegetables.
Unless you mean turnip style hunger winters, as occurred during WW1 and WW2.
Maybe you just need 100g of meat to get what you'd get with 1kg of legumes.
At least that's what people usually say, but if they do the maths, it's still generally cheaper to have a plant-full diet than a meat centred one (kg vs kg aside).