Endurance Unlimited Fueling Insights Explained: Iñigo San-Millán on Optimizing Carbohydrate Intake for Cyclists — Season 7 Ep 9
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Aug 7, 2025 
Iñigo San-Millán, a world-renowned exercise physiology expert and director of high performance with Team UAE, discusses the future of cycling nutrition. He elaborates on how TrainingPeaks' Fueling Insights feature transforms carbohydrate intake strategies for cyclists. Iñigo reveals the importance of metabolic flexibility and personalizing race-day nutrition, while debunking fat oxidation misconceptions. He also emphasizes the evolution of dietary guidelines and offers valuable insights into managing glycogen for optimal performance.
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Predicts Substrate Use From Power
- Fueling Insights predicts fat and carb use from power and athlete metrics.
- Iñigo San-Millán explains it links metabolic work to mechanical power.
Target Higher Carb Intake For Racing
- Iñigo San-Millán recommends 80–125 g/h carbs for many athletes during long, intense efforts.
- Train and plan to absorb that amount rather than stick to old 35–55 g/h rules.
Metabolic Flexibility Varies With Fitness
- Elite athletes show strong mitochondrial function and can oxidize more fat and lactate.
- Metabolic syndrome patients burn more carbs at low intensity and lack high-intensity glycolytic power.