Good thing I like to cook :)
“Cooked food does many familiar things,” he observes. “It makes our food safer, creates rich and delicious tastes and reduces spoilage. Heating can allow us to open, cut or mash tough foods. But none of these advantages is as important as a little-appreciated aspect: cooking increases the amount of energy our bodies obtain from food.”
That is what it comes down to maximum energy extraction from the foods we eat. The more energy you have the other things you can do to save energy. Like make machines.