[koliber]

If that is the case, then it makes sense that they did not lose weight.

However, from a layman perspective, it seems like it would be nice to be able to collaborate the measure of increased metabolism not only through one method (doubly labeled water) but also through weight loss over time.

It's like having an inaccurate measuring stick and basing the results of a study solely on measurements made by that one stick, while at the same time making an effort to make sure that no other means of measuring exist.