My friend, former co-competitor, business partner, and writing buddy Brad Kearns had been on a “Quantified Self” kick, tracking biomarkers, testing blood sugar and ketone levels, and staying abreast of all the various ways we can quantitatively check our progress. He’s months into a ketogenic experiment and had hoped to marry his subjective impressions to objective measurements to strengthen his intuition and improve his results.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)