Regardless of "just-so" stories, there exists a physical truth of how our ancestors lived. Sometimes we can learn it, and should at least consider how it affect

Regardless of "just-so" stories, there exists a physical truth of how our ancestors lived. Sometimes we can learn it, and should at least consider how it affects us, and pretty often (I suspect anyway) the optimal choice will be changing our habits rather than fighting our nature. (Though sometimes "considering" means figuring out how to do better).