Is the Root of Nihilism Simply Poor Health?

Random turbo thought:

Perhaps the root of nihilism is simply poor health.

To me, misery, depression, anxiety are simply manifestations of poor health (fatigue, overwork, no recovery, sleep deprivation, physiology out of whack from over-consumption of alcohol/weed/caffeine). Thus the sentiment:

Life is no good and has no purpose

Is this simply a reflection of poor health? Because if you are in great health, you desire the ‘eternal return‘– you desire to seek to live a lifetime!

Physiology 101