Cooking (and Meat) Made Us Human?

From the BBC, scientific speculation on how a change in diet from raw to cooked foods may have speeded evolution:

Without cooking, an average person would have to eat around five kilos of raw food to get enough calories to survive.

The daily mountain of fruit and vegetables would mean a six-hour chewing marathon.

It is already accepted that the introduction of meat into our ancestors' diet caused their brains to grow and their intelligence to increase.

Meat - a more concentrated form of energy - not only meant bigger brains for our ancestors, but also an end to the need to devote nearly all their time to foraging to maintain energy levels. 

(Hat tip: Bayou Renaissance Man)