Total calories burned per day (basal + exercise).
So, if you eat 1500 calories, and burn 2000 calories, you are at a 500 calorie deficit. In order to lose 1 pound you have to lose 3500 calories, so in theory if you do the same every day, you should lose 1 pound after 7 days (500 x 7 = 3500).
Please note that this is not always exact due to water weight fluctuations.
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