Interesting hypothesis regarding the adaptiveness of vegetable cooking as a strategy, Vegangelica
Although I haven't read anything about it, I assume that heat preparing meat, aside from making the food more easily digestible, it must also have been a super strategy as it kills parasites which is potentially a huge problem when you're on a meat diet.
edit :
I posted some time back that in the future, I believe meat will be grown in factories in rough equivalents to petri dishes. How would you feel about eating a lab grown beef?