To some extent it is correct to eat a little more when one exercises. However, for most people the body's basic use of energy makes the greatest demands and the difference between this and the amount needed for exercise is small. Example for a person weighing 73 kg:
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Normal consumption of energy during sleep or sitting still
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1900 kcal/day
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One hour of walking
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340 kcal
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One hour of intensive gymnastics
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750 kcal
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