Within a day of beginning a fast, most of the body's stores of _____ are depleted.

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Within a day of beginning a fast, most of the body's stores of glycogen are depleted. Glycogen is the stored form of glucose in the body, and it is used for energy during periods of fasting or prolonged exercise. Once glycogen stores are depleted, the body begins to break down fat stores for energy. Within a day of beginning a fast, most of the body's stores of glycogen are depleted.

Within a Day of Beginning a Fast, Most of the Body's