Definition of Carbo-loading

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Carbo-loading: An eating routine used by some athletes that involves downing large amounts of carbohydrates several days before a potentially exhausting endurance event. Carbo-loading has no known potential benefits for anyone except athletes under these special circumstances.

Carbohydrates are nutrients that are used as energy sources (calories) by the body. The other two types of energy sources are in the form of fats and proteins. Carbohydrates come in the form of simple sugars and complex forms, such as starches and fiber. Complex carbohydrates come naturally from plants.