This is wrong on so many levels... Just to point out the physiological misunderstanding: The word "binary" is quite misleading when applied to neurons. While n

This is wrong on so many levels... Just to point out the physiological misunderstanding: The word "binary" is quite misleading when applied to neurons. While neurons do work in concrete impulses, these impulses encode continuous values in the frequency domain. The evolutionary mechanism is also wrong: Starvation is also largely absent today, so any evolutionary pressure to preserve energy would be equally unimportant as other causes of death. In fact, obesity far outstrips starvation as cause for mortality. So if evolution had had the time to adjust, we'd all wallow in ambiguities. As a rule of thumb: attributing human behaviour that is more complex than basic emotions (fear, hunger, arousal,...) to evolution is almost always wrong. Overcoming evolutionary instincts is, after all, one of humanity's proudest achievements. It's also not entirely settled if thinking hard actually increases the brain's energy usage. It appears that the brain has a relatively high caseload, with minimal variability.