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Endurance Unlimited

Fueling Insights Explained: Iñigo San-Millán on Optimizing Carbohydrate Intake for Cyclists — Season 7 Ep 9

07 Aug 2025

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You're not seeing things. CoachCast has been renamed Endurance Unlimited. Stay tuned for more great episodes and more. Now, on to this episode... Dr. Iñigo San-Millán explains the science and strategy behind optimal cycling nutrition. Learn how TrainingPeaks' new Fueling Insights feature leverages decades of his metabolic research data to help athletes and coaches evaluate and individualize fueling plans based on athlete metrics, not guesswork. From breaking through the outdated 40-gram carb ceiling to personalizing race-day nutrition for every level of today's cyclist, learn how this tool is changing how we plan, perform and recover. 03:34 Iñigo Intro and Current Roles 07:50 Revamping Carbohydrate Intake for Athletes 12:41 Metabolic Flexibility 14:28 Pioneering Carbohydrate Oxidation Research 19:08 Fat Oxidation Misconceptions in Athletes 21:07 FATMAX: Peak Fat Oxidation Point 26:30 Race Performance and Energy Expenditure 27:48 Balancing Glycogen for Athletes 31:05 Cyclists' Nutrition & Intensity 38:31 Fueling Insights Workout Calculation Steps 39:48 Metabolism Variability Among Individuals 44:32 Risks of Fasted Workouts 47:16 Understanding Gross Efficiency Limitations 56:54 The Nutrition Evolution Learn more about Fueling Insights Learn more about TrainingPeaks Episode 1, Season 5: The Biochemistry of Zone 2

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