its just that most of the time i had someone else cooking for me! and usually i came home heavier than i left!
As was said before: put it on Polish hospitality. Still, it's good form to give the guest "the best" (which means: heavy) food. Just ask your family to make something different, I'm pretty sure they could find something with cereals instead of potatoes, veal instead of pork and so on. Or you can go to the marketplace, and buy what you need.
BTW, Pawian, is it Plac Imbramowski in Kraków?