I don't know lavita but aren't they supposed to be all we'd have after a nuclear war? Or something. Or am i confusing them with cockroaches?
Any way i just had a thought on why american food seems more like crap, even though as expat points out it isn't really any worse than what we have here...want to hear my theory? Well, if you insist... 
Most of our crap food is really bastardised versions of old nutritious, but calorific traditional favourites, eg, pies, pasties, sausage rolls, etc. They are made with crap ingredients so bolstered with fat salt and sugar, but we are familiar with the concept of the food generally.
American crap seems (and i believe often is) novel. Thereore it seems like someone has gone out of their way to take something fairly normal and squeeze more fat, calories etc in to it. Such as the corn dog, the breaded deep fried balls of macaroni cheese you used to get at tgis etc.
There's a paranoid part of me that thinks they have done this in order to seduce us with their lardy goodness, to make money out of us (and this part is fueled by a recent guardian article about american food, and how the average american chews less than they used to as foods have been engineered to melt in the mouth after a specified number of chews, as this feels more "satisfying" and so their product wins. Sorry no link or real facts re this, on phone, and as it's a digression maybe no one even wants to know!)
Lecture over. (smile)