Right now I assume Fitbit uses your age, heart rate data, and BMI, and then will calculate a different estimate for calories burned based on your gender, which is to say a proxy for body fat%- as women will carry more fat/less muscle on average for a given BMI (heigh/weight metric) than men, due to the effect of testosterone on body composition and muscle mass. Obviously if someone hasn't enetered in their Body Fat measurements than it would default to the age/height/weight but please gives those of us with more detailed body info more accurate calorie burn! This can be simply done using a commonly used BMR equation that incorporates body fat. I would like to see Body Fat implemented in the calorie burn estimations because I really feel this will help accurately measure my calorie burn (if for example I weight 250 lbs and have 15% body fat I will be burning way more calories per day by just living than someone weighing 250 lbs and having 30% body fat). But many of us including myself either manually enter in our calculated Body Fat, or they use the Fitbit Aria Scale which automatically calculates body fat and syncs to the dashboard. Of course for people who don't have body fat measurements, it's easy. Problem is calculating BMR with just height/weight/age BMR is a very poor way of calculating it. Right now I believe Fitbit uses your height, age, and weight to calculate your BMR (Basal Metabolic Rate) which is the calories you burn if you did absolutely nothing all day just by living and breathing and then adds calories burned due to steps/activity/heart rate to that.
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