Nutrition
Caffeine Glycogen Sparing in Endurance
Caffeine glycogen sparing in endurance may shift early fuel use toward fat—modest effect that still requires adequate carbs on long events.
Caffeine glycogen sparing in endurance describes how moderate caffeine may shift substrate use toward fat oxidation early in effort—potentially preserving glycogen for late stages when paired with carb fueling. Effect size is modest and individual; it is not a substitute for adequate carbs on long events.
Fasted long runs plus caffeine can raise cortisol stress for some athletes. Use during rehearsed sessions with normal fuel.
Common questions
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Can caffeine replace carbs on long rides?
No—it may spare glycogen slightly; you still need rehearsed carb intake for events over ninety minutes.
Related terms
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