"good" and "bad" are comparisons, not quantifications. The correct question is something like: all else being equal, what is the difference in expected lifespan

"good" and "bad" are comparisons, not quantifications. The correct question is something like: all else being equal, what is the difference in expected lifespan between a juice drinker and a juice abstainer? I'm pretty sure that HN has consumed more of my lifespan than any diet could compensate for.