CB> "...some weight gain just might be immune-related..."

> "...offending substances are cordoned off..."

> "...it's really like they can eat anything and the weight drops off of
them. The rules of calorie physics just don't seem to apply..."

This is absolutely fascinating to me and is the only explanation for how it
is possible when taking up a paleo diet to increase fat and calorie intake
yet lose weight.  The common "rules of calorie physics" would declare this
an impossibility.

My thinking on this right now is that both factors are at work.  Someone
slaving away on a low calorie, low fat diet can drop weight easily by
changing over to the much higher fat- and calorie-laden paleo approach.
The withdrawal hunger is such that you just go crazy eating nuts, bacon,
meat.  You just can't seem to get your fill at first on the diet, yet the
weight slides right off as the body gets used to the idea that it doesn't
have to defend itself and eliminates the fat.  After a while, though a
plateau is reached and the body starts to hold onto excess calories again,
to store fat.  Just how much "excess" calories and/or fat is required to
stop losing or start gradually gaining weight probably depends upon the
person.