It's amazing that just doing what feels good and ignoring all advice - whether from online / media / friends - often leads to a better end result than studying up on everything. Can certainly land you in trouble too, but largely, the body's built-in feedback systems are better at telling me what I should do than the words other people create to explain how their body's feedback systems have worked.
Check out ulta labs (obtuse, some learning curve) if you want to DIY, otherwise there's a couple services out there that make the learning curve shorter. One I see come up a bunch is Inside Tracker.
Health and fitness is a fun little side hobby that you can turn into a fairly intellectual exercise. Get hooked on Peter Attia's podcast, read a bunch of studies, get labs done, put together an exercise and nutrition plan and then get DXA scans to watch body composition change. It can easily replace other intellectual hobbies :)
Recently moved into an apartment with a 24 hour gym and started doing basic strength training with weights as well - quickly learned that my body prefers that to cardio, and now I do 2-4 miles of walking a day and 20-40 minutes in the gym. It's amazing. Wish I'd been doing it for years.
I'll give that podcast a look