Interesting stuff. One point I'd nit-pick is that getting a little fat makes it easier to get MORE fat. There is no braking mechanism for weight gain when it is in the form of hyperinsulinemic fat gain. I think I wrote something about this in another thread: We have a myostatin gene which limits muscular gain. We have no lipostatin gene. I think Art Devany's perspective on this is more accurate than Lyle's. The body is trying to protect itself from elevated blood glucose levels and thus grows the fat base as a dumping ground. The fat then secretes hormones that help to propagate itself. This all happens after the muscles have become insulin resistant.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."