Set up a "Health & Fitness" project in Claude (or whatever). Feed it:
* Basic data: height, weight, age, sex
* Basic metric snapshots from Apple Health or whatever: HRV range, RHR, typical sleep structure - go through everything and summarize it
* Typical diet (do you track it in MFP or Cronometer? Great, upload a nutrition report)
* Any supplements and medications you take
* Typical exercise habits
* Any health records you have - bloodwork results, interpreted imaging results, etc.
* Family history like you would describe it to a doctor
* Summary of any health complaints
* Anything else that seems relevant.
Then go through a few conversation loops asking it if there's any more information you could provide that would help it be more useful.
Then ask it things like "Given <health complaint>, what should I be doing more of? Less of?"—or "Please speculate about potential causes of <thing>".
Or, even if you don't have any particular health complaints you're working with, just being able to ask it questions like "What's one supplement I should consider starting or stopping today?" (and then obviously do some follow-up research...)
This is life-changing. Anyone skeptical of this has not tried it.