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The calories burned figure gets reset to zero at midnight each day and it's quite normal to see some for today when you set up your fitbit.
As well as tracking calories burned through activity your fitbit also tracks your BMR calories. These are the calories you burn just keeping your body alive (even when asleep). They are calculated from your profile settings for age, height, weight etc so you needn't be wearing your fitbit to get them. What you are seeing includes the total BMR calories burned since midnight.
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