My dad has had it for years. I know his big no no's are anything with seeds (my stepmom picks all the seeds out of tomatoes or peppers), beans, fresh bread, peels or skins, nuts, and maybe leafy greens (this one may be because he hates salad anyway). I think he has to be pretty careful with seasonings like pepper. He got really sick one time and thought he was being very good on his eating. Come to find out, he had been eating blueberry muffins at the coffeehouse. He didn't know the blueberries had little seeds in them. At one point, to avoid a colostomy, he lived on Ensure and boiled potatoes for several months. He's really careful and he's doing a lot better, as long as he doesn't get too cocky and go too crazy.