MetaChat is an informal place for MeFites to touch base and post, discuss and
chatter about topics that may not belong on MetaFilter. Questions? Check the FAQ. Please note: This is important.
They used to sell that product in the States, too- I remember my grandmother using it in the 70s. (They looked like little caramel candies- some kind of appetite suppressant. I shudder to think what was in it.)
I think it was made of some kind of guar gum or something like that. It was intended to expand in your stomach to make you feel full. On that basis, I would expect it was probably also fairly uncomfortable to expel too.