I'm pretty sure the bod pod works via bio-impedance as well.
Other than as described by BIB, another way to find your BMR (and estimated TDEE based on BMR) is with a respirometer that some docs have in their offices. I don't remember the exact science behind it but it has to do with measurable respiratory quotients.
From my experience the respirometers I've seen did not yield believable results as the TDEE always seemed too high, but that was only one brand/model. I'd like to believe that better ones exist.





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