Retrospective Calorie Changes

[imd]

I log all my fitness data on a spreadsheet outside of fitbit.  I've only just noticed that all my daily calorie data has changed a little from what was logged at the time.  The changes are relatively small all about 10 to 25 calories less but it doesn't seem to make much sense.

[SteveH]

Have you updated your weight or other profile settings? Any changes to these will affect all data.

[imd]

I've updated my weight, but I didn't think this would impact past data.

[SteveH · Accepted solution]

It would be easy to test - try updating your weight to be as it was and see if the calories change back. You can always delete the weight log entry afterwards,

[imd]

That's the answer!!!  If you add a new weight it reduces your previous calories burnt.  I haven't checked how far back it changes the data, but it is at least a month. 

It makes absolutely no sense at all.