My middle son is diagnosis'ed BiPolar (BP), and all through the years growing up, would horde and gorge. If I bought a box of cereal he liked, it would be gone in at least 2 sittings, possibly just one. He was so afraid everyone else would "get the last" soda/cookie/koolaid drink/whatever, that he would stash several away here and there. He even hid stuff in the grandfather clock and the cover above the cat box.
He's learning to control himself to some degree, but will still eat an entire box of snack cakes if they're around, just one after another.
