Good way to stretch the stomach - drink a heap of water after downing a high carb meal (oats, muesli etc), stretches the stomach more than just water alone because of the oats swelling up. Sure, you'll feel kinda overfull and sick for a while, but once the body flushed the water through, you'll feel good as gold.
Added benefit that the oats may release the water slower during digestion, keeping you hydrated for longer. (This is only something I've read elsewhere, so don't quote me on this, just kinda makes sense to me.)