I'm a marathon runner and run 45+ miles a week and renovate a house full time. My calorie burns are very high, average 2800 per day (my BMR alone is only around 1250) but have been as high as 4K.
I don't know how accurate it is for people who workout a lot. I've worn it since April and not lost any weight. My body composition has changed - lost fat, gained muscle, but regardless I should have lost pounds by now. I don't lift weights outside of bodyweight exercises once a week, though my remodeling work takes strength.
It says my calorie deficit is around 600 per day. I measure my foods and have no problems with eating clean.
Some are concerned if I drop calories more it will be too much of a deficit but if the device is overestimating what I am burning then it would not be too much to reduce.
Edited by: TRI_BABE at: 8/16/2012 (14:20)
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