Fair point that it's the methods used to grow the meat that is likely more unsustainable than meat itself. I'm sure if carnivore diets really are more beneficial to human health we'll find ways to meet that demand more efficiently.
I'm curious what is your view on insects as an alternative and more efficient source of protein? Many non-western countries eat insects regularly, and from what I understand they're the most efficient form of animal proteins available.
first of all, chitin is not a protein, it's a sugar polymer, with some amino acids in its structure
https://en.wikipedia.org/wiki/Chitin
> Chitin (C8H13O5N)n (/ˈkaɪtɪn/ KY-tin) is a long-chain polymer of N-acetylglucosamine, an amide derivative of glucose.
secondly, insects have all kinds of parasites that are unfamiliar and potentially dangerous to humans
thirdly, it is impossible to eliminate their elimination organs and this is just disgusting, frankly, think of what it's like eating prawns or shrimp that haven't been gutted properly *shudder* - and this is why the bible repeatedly says do not eat anything that crawls or flies
the most efficient type of protein as far as i'm concerned is goat, it is lean, but fat enough to not leave you short on fats, the animal itself can and does eat almost anything green, they even famously will nibble on some paper and cardboard if they see it, its hide is perfect for most purposes except heavy protection (most leather gloves are made of it), and the fibre-producing goats make very comfortable soft clothing, less abrasive than sheep, its milk is quite high in fat but this varies by the breed, they can live in conditions from deserts to alpine and taiga environments, with the right kind of breed and are easier to herd than sheep
in fact, goat is the primary red meat consumed by the largest number of people on the planet, and their dairy products, milk and yoghurt, the most common forms of dairy consumed per capita
cows have more uncommon requirements for their raising, and need a big range if the land is low fertility like tundra or prairie or scrubland, they primarily eat grass, and don't really browse much on anything else
having said that, their fat is a higher quality and quantity in the meat... but also, the most common kind of dairy cow produces a harsh protein that is difficult for a lot of people to digest, whereas goat and sheep milk is better, though jersey (red) cow milk is also good
from a health and evolutionary perspective, humans have been herding sheep, goats and cattle since maybe at least 15000 years and a great number of human haplogroups are adapted to it, as well as drinking the milks, as some 40,000 years ago a new mutation appeared in our genetics where the lactose digestion genes stopped turning off, which happens in most other mammals prior to sexual maturity (for humans this is about 8 years old)
almost every part of these animals is useful if not highly nutritious
any "science" that praises insects as food is bullshit fake science to sell yet another industrial production process for food that actually will just kill people in the long term
