It’s especially attractive if you read something that promises to help your aching joints, or make your rash go away. I don’t promise such easy stuff. My thing is “What is going on with your lifestyle and nutrition that might manifest as arthritis or a rash?”
So test. How can you fix something if you don’t know it needs fixing until your diagnosis of something life-threatening?
These tests I highly recommend. At least twice a year or as often and you feel the need.
CRP should be under 1. If not, get on an anti-inflammatory diet and look at supplements.
Vitamin D level is not totally agreed on, but 40 to 70 seems to be a consensus. That said a big study showed women at 50 level had a huge reduction in breast cancer occurrence.
A1C measures your average blood sugar over about 3 months. 5 or below means your brain is not shrinking, you are not at risk for a host of physical and neurological insults.