I've read Outlive (and am a big fan of Peter Attia in general), but there's really not much there besides "exercise more, eat better".
I was on strict keto for a year, with daily blood tests to monitor ketone levels. My fasting glucose would still be above 100 often enough. Even a moderately sized carb-heavy meal can send my BG above 200 (even after being off of keto for a few months).
Maybe if I paid the $2500 for his "Early" program that details all the labs he does I might get some insight, but that is clearly priced for someone outside my tax bracket.