Although high in nutrients, the difficulty in digestion makes it a carciogen. Particularly red meat - bird and fish (pre omnipresent plastics and heavy metals) are relatively healthier.

Since the grain industry gained power in the 1940s. They funded much research to say

1. Meat is hard to digest (when in fact carnivorous animals have the shortest gut; we're omnivores and have a medium gut, we also have the most acidic stomach acid of the mammals which is an adaptation to eating meat)
2. Grain is the healthiest food (the only type of animal that does well on seeds is birds, they don't have teeth for bread to get stuck between and rot. The ancient Egyptians lived on bread and had the worst dental health)
3. That humans need a balanced diet of many different things - which we do when we're eating nutritionally poor foods like bread, but many thrive on simple diets of fatty meat (Inuit before they adopted the standard American diet; Buffalo hunting native Americans; modern followers of lion, carnivore, zero carb)

The standard diet as recommended by science (much of which was bought by the wheat peak bodies) has made us fat. Getting fatter is the most unhealthy state, it leads to diabetes, hypertension, bad cholesterol and early death

If you eat it more than 2 - 3 times per week.

Fr meat is the reason we have big brain.

Now if you wanna argue that we should have never left the trees and created civilization then you may have a point.