Endurance athletes should avoid carbohydrates in the hour prior to exercise to avoid reactive hypoglycemia.

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Historically, endurance athletes have been advised to avoid carbohydrates in the hour prior to exercise-the most convenient time for many athletes to consume a pre-exercise snack-due to concern for rebound or reactive hypoglycemia and diminished performance. However, evidence suggests that carbohydrate consumption in the hour before exercise provides more benefit than potential harm, though it probably does not provide the same performance boost as carbohydrates consumed at least 2 hours before the onset of exercise.

Endurance Athletes Should Avoid Carbohydrates in the Hour Prior to Exercise