Animals with no analytic faculties still manage to live healthy lives, so how do they do it? Simply, our bodies have built-in systems for regulating automatic functions. The problem is it's built to survive in the state of nature and modernity is an unnatural environment that throws a wrench in the system.
Once you realize this, the solution is clear: minimize the bad influences of modernity and try to live as close as possible to how our ancestors did. Eat meat when hungry, drink water when thirsty, lift heavy weight, and sleep at night and wake up in the morning, get some air and sunlight etc.
I've been down the quantified-self road before and at best it leads to a big useless unanalyzed database. At worst, you become paranoid constantly questioning whether you're getting the optimal sleep, calories, sun etc.