Kerry Trebilcock, 21, suffers from pica, which causes victims to crave objects that are not food.
Kerry, of Mylor, Cornwall, said: "One day I will beat this and be able to have a shower or do the washing-up without feeling hungry."
Sponge eater Kerry said she likes to spice up her bizarre snacks with hot sauce or mustard.
Sometimes, she dips them in tea or hot chocolate like biscuits.
She also chomps on chunks of soap — but only organic fruit-flavoured varieties, with lemon and lime her favourite.
Kerry said: "I have been very particular about the type of sponges and soaps I'd eat and how I'd prepare them.