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Calories are used to express the heat output of an organism and the fuel or energy value of food. Baisicaly, they're measurements of heat measured in food and in the body. And the average person if they're 40 should consume 2000 calories a day, and the average 9 year old should consume about 1500 calories a day.

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Q: What are calories and how many should a 9 year old and 40 year old adult take every day?
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How many calories should a 14 year old girl have every day when shes 5.3?

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