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Metabolic flexibility is the capacity to match fuel oxidation to fuel availability\u2014or switch between burning carbs and burning fat. Someone with great metabolic flexibility can burn carbs when they eat them. They can burn fat when they eat it (or when they don\u2019t eat at all). They can switch between carbohydrate metabolism and fat metabolism with relative ease. All those people who can \u201ceat whatever they want\u201d most likely have excellent metabolic flexibility. So, why does it really matter, and how does it happen? Let\u2019s get into the weeds today.

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