Carbohydrate Loading
topic
Carbohydrate loading is the strategic practice of increasing carbohydrate intake in the 24–72 hours before a glycogen-dependent endurance event (events lasting >90 minutes) to maximize glycogen storage beyond normal resting levels — with modified carbohydrate loading protocols achieving glycogen stores of 150–200% of normal, delaying the glycogen depletion ('hitting the wall') that limits performance in events like marathons, triathlons, and long-distance cycling, and improving endurance performance by 2–3% in events where glycogen is the limiting substrate.
Role
Carbohydrate loading is one of the most consistently effective evidence-based nutritional ergogenic interventions available for endurance athletes — yet is frequently implemented incorrectly (too late, insufficient carbohydrate volume, wrong event duration threshold) or avoided by carbohydrate-restricted athletes whose overall dietary philosophy conflicts with the science of glycogen-dependent endurance performance. The person who runs a marathon on a low-carbohydrate diet because of general dietary philosophy rather than specific understanding of glycogen metabolism is prioritizing dietary consistency over performance optimization — a trade-off that may be appropriate but should be made consciously.