Full subtitle: "POTATOES: Humans evolved large brains because our ancestors ate starchy carbohydrates" Our saliva suggests improved carbohydrate digestion: "..

Full subtitle: "POTATOES: Humans evolved large brains because our ancestors ate starchy carbohydrates" Our saliva suggests improved carbohydrate digestion: "...humans possess six salivary amylase genes, while other primates just have two, increasing the ability to digest starch. ...after cooking became widespread and the salivary amylase genes multiplied, this increased the availability of dietary glucose to the brain and foetus which, in turn, allowed the acceleration in brain size which occurred from around 800,000 years ago onwards."