I can't imagine that all that stress to min/max health outcomes through strict behavior changes is good for you or worth it in the long run.

I subscribe to some nutrition and fitness subreddits and I see people obsessing about minute details of what they eat, how much they sleep, obsessing to take control over every facet of their lives because of some study they read on the internet.

I contend that worrying about these things is counter productive. Of course you should get enough sleep, you should exercise regularly and generally eat healthy. Check with your doctor, but this will probably be enough to avoid life style inflicted harm long term.

Strict controls and obsessive attention to your everyday life to maybe postpone death by some unknown amount of time, probably not worth it. Death sucks, but it's inevitable and no amount of finessing health choices will change that.