distant food

i recently noticed a weird phenomenon. at fast food joints (and other places that put pictures of their food in their menus), the object you're buying is usually in sharp focus where the rest of the items (for example, the fries and coke) are out of focus. so what is that? are all the items really large and far, far away, so far that they lose focus? i've noticed it in the burger king menu and the friday's menu, but i bet it's elsewhere.

notice how the mashed potatoes, even on the same plate, are out of focus. how large is the plate?