From an evolutionary perspective, we have evolved: we use tools and process nearly anything we eat anyway. Plants are the only thing we eat with minimal preparation, and only some of those.
When was the last time you had raw beef? for me, it was beef tartare a few years ago...
Raw grain? Nope, that's all processed, either by boiling, or grinding and turning into something else.
Homo Erectus was thought to have subsisted on raw meat. There's evidence of intestinal parasites that suggests such a diet.
Apparently, at some point, we decided to cook our meat, which reduced the parasite load and removed the need for low pH comparative to other carnivores.
But not too long ago, humans did eat some raw meats. Primitive hunters sometimes ate raw hearts, and drinking fresh blood was not unheard of. 1,000 years ago, the Mongols would sometimes nick their horses and drink blood to sustain them on long journeys.
It's also usually prepared in some way, whether it's flash frozen or treated with vinegar.
But, I guess my point is that the evolutionary argument doesn't really make sense in a world where we evolved tools and have been eating processed food for a long, long time.
Also, evolution happens a lot faster than people give it credit for. Something I read somewhere is that the genes for lactose digestion only started remaining "switched on" in adults like 8,000 years ago, and yet a third of the world now has this gene.
That's a really short time! That's not far from when we develop writing (around 6,000 years ago).
When was the last time you had raw beef? for me, it was beef tartare a few years ago...
Raw grain? Nope, that's all processed, either by boiling, or grinding and turning into something else.