02-04-2016 09:35
02-04-2016 09:35
02-05-2016 15:44
02-05-2016 15:44
Short answer, yes.
If you go to your Settings, Personal Info, Body Info, you'll see that Fitbit is updating your entered weight there to reflect your last weight log entry. I've also seen my BMR per 15 minutes or 5 minutes decrease on the appropriate charts over my 25-pound weight loss. I started at 228 and I'm down to 203. My BMR has dropped from 1,835 to 1,722. Over that time Fitbit has dropped my hourly BMR from 76 to 72, so I'd say that's accurate.
Charge HR, Flex | Windows 10 | Android | iPad
Take a look at the Fitbit help site for further assistance and information.