Nutrition
Caffeine Glycogen Sparing Effect
Caffeine glycogen sparing may modestly shift early fuel use in endurance—carb periodization and sleep still dominate long-event performance.
Caffeine glycogen sparing effect in endurance research suggests moderate doses may shift substrate use toward fat oxidation early in effort, potentially preserving glycogen for late-race surges—when caffeine is timed pre-event and athletes are habituated appropriately. Effects are modest and study-dependent; fueling still needs carbs for long events.
Dehydration myths at athletic doses are overstated with normal fluids.
Common questions
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Can caffeine replace carbs during a marathon?
No—it may tweak early metabolism slightly. Long events still need planned carbohydrate intake; caffeine is additive, not a fuel substitute.
Related terms
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