Perhaps it's more along these lines: We wake up for the 9 to 5. We break the fast at 8 or 9 or 10 (put a number of your choosing). We eat lunch at noon. The 9 to 5 ends. We go back to our den and eat at 7. Then it repeats. Nothing inherently wrong with this. But it's quite robotic, no? But are we robots?
It is April 18, 2012. I read a news article yesterday saying the total processing power of the whole world is about that of a single human brain. Ironically, this is a robotic way to compare but it gets the point across rapidly. (i.e. The comparison of a computer to a human brain doesn't mean that a human brain has been reduced literally to a non-sentient machine obviously.)
We are not robots. But we increasingly live a robotic life.
Perhaps we just have not adjusted to this robotic life. The way we have evolved clashes with these artificial routines.
Perhaps it's good to mix it up once in a while in our own way. Go primal.