Huh, I think I read your comment too quickly and missed the "as long as...: qualifier and then started replying and went off on a tangent and forgot what the original comment was. Hah. My bad. Also didn't notice your name, hence my reference to you in the 3rd person.

Yeah, weight's not the best metric to use without taking into account body composition.

Oh wait, I think I figured it out. I'd combined your post and paper-machine's in my head, so I thought the simple calories-out-calories-in model in the highest level post being the thing referred to by discussion of conservation laws.