yeah i would assume the 10% thing has to do with how much of our brain is used for thinking and conscious mental tasks....cuz the human body does SO MUCH shit (digests food, sends blood through all different areas, heals injuries, regenerates skin, sends the nutrients and minerals u eat all over the place, etc) that the brain is controlling that u don't even realize...you're not consciously digesting ur food and deciding what to do with the stuff from it..