Hey, Tom, I figure you've got a good answer for this one.
Kcals is strictly a measurement of heat capacity (raising the temp of 1 gram of water 1 degree celsius--I think). So how then, is this equated with the measurement of weight, vis a vis: losing weight? This would seem to imply that all adipose tissue is the same. Or--is it not the same and then this causes the fluctuations we see in weight loss from individual to individual and even within the same person?
On a side note, but possibly related, why do we get plateaus? For the last 2 weeks, I've been stuck at ~272 lbs. Finally broke through 2-days ago and am now at 267. Could this be related to the above issue?