According to sports nutrition guidelines, carbohydrates primarily help athletes by ____.
Providing main source of energy for physical activity
Carbohydrates are the body's preferred and most readily available fuel source, broken down into glucose and stored as glycogen for use during physical activity.
Sports nutrition guidelines emphasise carbohydrate intake specifically because it provides the primary energy source that powers muscle activity during exercise and competition.
Carbohydrates do not directly improve eyesight, strengthen bones, or replace the need for hydration, so none of the other options describe their primary role for athletes.
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