How can a person burn more calories per day than consumed? Where did the extra energy come from if food not equivalent to that amount was consumed?

Question

How can a person burn more calories per day than consumed? Where did the extra energy come from if food not equivalent to that amount was consumed?

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Answer 1

Body Fat is essentially an energy store, so when you have a calorie deficit, your body will start to break down body fat to get the extra energy it needs.