Well, if our brain costs just as much energy as it should, and if we can't spend every waking hour of the day feeding, then the only alternative, really, is to somehow get more energy out of the same foods.
Bé, si el nostre cervell gasta tanta energia com hauria de gastar, i si no  podem passar totes les hores del dia menjant, realment l'única alternativa és, d'alguna manera, aconseguir  més energia del mateix menjar.