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My friend, former co-competitor, business partner, and writing buddy Brad Kearns had been on a \\u201cQuantified Self\\u201d kick, tracking biomarkers, testing blood sugar and\\xa0ketone\\xa0levels, and staying abreast of all the various ways we can quantitatively check our progress. He\\u2019s months into a\\xa0ketogenic experiment\\xa0and 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)