Why Carb Loading Works
Your muscles store glycogen, the high-octane carbohydrate fuel that powers sustained efforts. Carbohydrate loading increases those stores, helping delay fatigue. Each gram of glycogen binds water, so a small, temporary weight gain often signals you have more fuel onboard.
Why Carb Loading Works
Carb loading benefits events generally lasting longer than ninety minutes, like marathons, long triathlons, and gran fondos. For shorter events, it may not help as much; instead, a well-timed high-carbohydrate meal and possibly a carbohydrate mouth rinse can be enough.