>>His personal
trainer claims to have seen this over and over again: any time someone
changes their diet in some substantial (i.e., non-trivial) way, they lose a
bit of weight. I've started to ask people about this, too, and I see that

there may be some physiological basis for this.  It's also possible that
it's related to the fact, at least in part, that when people start a new
plan, they tend to be more attentive and diligent about what they're doing.

Judy