History and Evolution
Evolution and High Protein Diets Part 2
Loren Cordain, Ph.D. and Ph.D.
The typical hunter-gatherer diet was high in protein. 
Evolution and High Protein Diets Part 1
Loren Cordain, Ph.D. and Ph.D.
By examining the environment under which our genome arose, we are able to determine if high protein diets are helpful or detrimental to our health. 
The Perfect Teeth of Hunter-Gatherers?
B.A., Casey Thaler, B.A., NASM-CPT, FNS, et. al.
Scientific literature supports the idea that hunter-gatherer teeth were healthier than modern-day teeth.