Despite major flaws in the raw diet philosophy, one needs to question why a so-called natural diet leaves the dieter dependent on pills for B12 (impossible to get without animal products, such as meat or eggs) or zinc (very hard to get on a raw diet).

Raw foods certainly aren't safer than cooked food, as some claim.  Most commercial chicken and a good deal of beef and pork, sadly, are loaded with bacteria and parasites

Pity the poor bacterium, the Rodney Dangerfield of the unicellular world.  It eats our trash, makes soil fertile, turns the food we swallow into useful vitamins, and yet it gets no respect.  Most people, when you get right down to it, are just plain bacteria bigots.  They want to run all 2,000-plus species of bacteria out of town just because of a few ornery germs that can harm us.

That said, humans have always eaten some cooked food.  So, too, do many land animals; and so did our human ancestors.  How?  Largely in the form of roasted grasshoppers or other small critters caught in forest fires and brushfires.  Fire foraging was quite natural and helped secure our survival.  This is how we developed the taste for cooked food.