Sorry, I didn't make it very clear what sort of answer I wanted. Specifically, if two people have equal calorie consumption and loss through activity, but the paleo dieter has more favorable body composition, where does the extra energy go on paleo diet if not to fat? The high glycemic dieter will put on fat so I know where their energy is going. Since the paleo/low carb dieters calories are not going toward fat storage, it must be being utilized in some other way. What is that way?
In reference to your suggestion, I actually wouldn't put on any fat, I lived like that (as most people did) for a long time and always had low body fat. Even when not exercising regularly. :-) Even still, there is more to health than body comp., which is why I am a faithful paleo supporter. :-)