I've heard this too. If you dont eat anything, basically your body preserves whatever energy you have as fat. If you go longer than that, then the body will use up the energy (in the form of fat) and THEN you become skinny.
Not sure If I believe it, though in theory it makes sense.
Posted by: Blacknight159
Dunno if this is true, but by not eating your body goes into this "starvation mode" or something like that where your body conserves fat and whatnot.