Continuing this post, here are some scientific articles on meat-eating and the evolution of the human brain. While we can't reduce consciousness to the brain it seems a bigger and more complex brain, one more evolved, is prerequisite for so-called 'higher' consciousness.
This article said: "There is no doubt that human evolution has been linked to meat in many
fundamental ways. Our digestive tract is not one of obligatory
herbivores; our enzymes evolved to digest meat whose consumption aided
higher encephalization and better physical growth. Cooperative hunting
promoted the development of language and socialization. [...] Killing
animals and eating meat have been significant components of human
evolution that had a synergistic relationship with other key attributes
that have made us human, with larger brains, smaller guts, bipedalism
and language. Larger brains benefited from consuming high-quality
proteins in meat-containing diets, and, in turn, hunting and killing of
large animals, butchering of carcasses and sharing of meat have
inevitably contributed to the evolution of human intelligence in general
and to the development of language and of capacities for planning,
cooperation and socializing in particular."
Another article on human evolution and meat eating:
"'Only two types of primate survived the climate catastrophe,' says
DomÃnguez-Rodrigo. There was a 'plant-processing machine on the one
hand and a meat-eating machine on the other hand', he says. 'The
meat-eating machine evolved a bigger brain. The meat-eating
machine became us.' However the key question becomes how much meat
should a cognitive-health-conscious person eat. Too little can delay
development and cognition. But too much, particularly if it is low
quality and mass produced, is associated with other health concerns,
such as heart disease and cancer, along with memory problems later in
life."
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