If humans only ate raw, unprocessed food, we would need to eat for 9.3 hours a day in order to fuel our brains.
Cooking meat may have acted as a form of "pre-digestion", allowing less food energy intake to be spent on digesting the tougher proteins such as collagen. The digestive tract shrank, allowing more energy to be given to the growing brain of H. erectus.[29] If they ate only raw, unprocessed food, humans would need to eat for 9.3 hours per day in order to fuel their brains; which use about twice as much resting energy by percentage as other primates.[30]@Curionic
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