Hi!
For a very long time, I couldn't understand why I wasn't losing weight even though I was eating at the calorie level dictated by my Fitbit - when I say "long time," I mean over a few years (I've been a Fitbit user since May of 2012). Finally, last year I had my resting metabolic rate tested by my doctor, and found it to be about 25% lower than what it appears Fitbit was using as a baseline for my daily calorie burns. This made the total daily burns given to me by Fitbit almost useless.
Through a lot of research and trial and error I was able to work something out where I adjusted my age and height as well as switched from a Charge HR to an Alta and I think I've finally gotten my daily burns where they should be. However: (1) my distance walked each day is incorrect due to not being able to appropriately adjust my stride, (2) my expensive Charge HR is now useless to me (as the change in my age has lowered the HR range for exercise zones for me and significantly over-inflates calories burned), (3) the body fat percentage feature on my expensive Aria scale is now useless to me (it won't even calculate anymore, I assume due to the age I entered since that's when it stopped), and, possibly most importantly, (4) not everyone who runs into this issue is going to have the time and knowledge to figure something like this out.
It's an accepted fact that BMR calculations based on general statistics can be off by a wide margin - they are based on estimates and averages only, and while they're "good enough" for most people they're still going to be grossly incorrect for a lot of Fitbit users. Being able to take those estimates and averages and replace them with a personalized number based on actual medical testing would be a huge step in making the Fitbit experience infinitely more accurate and useful for those users who need that capability and are armed with the knowledge to address it appropriately.
PLEASE incorporate this feature!!
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