Inside Sports Nutrition · Bob Seebohar and Dina Griffin

Dr. Marco Altini's Metabolic Efficiency Experiment - Ep. #215

·1 hr 6 min·5 clips
Marco Altini discovered he was burning no fat during runs, even at easy intensities, despite years of high-carb fueling.
Dr. Marco Altini shares his year-long self-experiment with periodized nutrition and metabolic efficiency testing, revealing how he shifted from a high-carb diet to improve fat oxidation, resolve GI distress, and enhance his ultra-running performance. He discusses the importance of individual variability, the role of diet over training in changing metabolism, and practical takeaways for athletes.

As heard by us

A grounded look at periodized fueling, metabolic testing, and where rigid carb rules start to break down.

Dr. Marco Altini, with Bob Sibohar and Dena Griffin, lays out a simple shift: after years on the same high carb pattern, he moved to periodized fueling because it fit training demands better. The practical details matter more than the theory.

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Why you'd press play

You want fueling rules that bend with the work.

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