They do feel like complete pieces of shit at all times. Whenever their stomach is not full, they feel it as painful hunger (because it happens so rarely) so they go back to stuffing themselves way past full with the usual fiberless junk food they like. Then their intestines get clogged with multiple kilograms of food so they still feel like shit when not eating. And you can bet they'll suffer when trying to get it out, but they won't be able to feel light for very long before their stomach starts requesting more food again. And that's the ham cycle, keeping them in a perpetual bad state, all in the name of food.