Irony apart, my idea (borrowed somewhere I can't remember) is that body functions are too intertwined to just isolate a single variable, or determine a single cause.
People, consume what you want, sleep how you want, and assess what it is that you "want" individually. It's not hard too see if alcohol, sleep deprivation, etc. causes you harm or not.
As for long-range damage or good: look at people who lived long (and healthy).
Irony apart, my idea (borrowed somewhere I can't remember) is that body functions are too intertwined to just isolate a single variable, or determine a single cause.
People, consume what you want, sleep how you want, and assess what it is that you "want" individually. It's not hard too see if alcohol, sleep deprivation, etc. causes you harm or not.
As for long-range damage or good: look at people who lived long (and healthy).