Unpopular opinion. Humans never ate meat as an "ancestral diet". We were fucking foragers till we were able to secure a consistent meat source in farming. Can you imagine taking out wild animals that can risk your life for just your family to starve? Alot of advancements and selective breeding lead to us being able to have meat as a part of our diet. Both agriculture and animal husbandry have allowed us to grow as a population and achieve "unnatural" life spans and body types (while also advancing our technology). Sorry but the bs of meat only diet or vegetarian only diet being an answer it isnt it. Chemicals and unnatural processes are poisoning us. Dont subscribe to an ideal and be blinded to the bigger picture. We are meant to be omnivorous of food and information. We never settle on any source.