"The fault, my dear Blubber, is in our guts..."

An amazing discussion by Dafydd ap Hugh at http://biglizards.net/blog/archives/2007/01/a_loaf_of_bread.html , which cites an AP report on medical research indicating that weight levels in humans may well be linked to the types of bacteria residing in our digestive tracts. As Dafydd notes, this could explain why some people eat huge amounts of food, and don't gain weight, while others seem to eat much less, and still pack on the pounds.