I'm guessing they mean processed foods. Like, vegetables: fine. Stuff that comes in a box/bag etc: not fine. Obviously you also can get vegetables at a supermarket.
yes, exactly. avoid the middle part - fresh and refrigerated food is on the outside usually. Processed in the middle. Anything that has a nutrition label on it, is probably not nutritious is my rule of thumb, there are exceptions of course, frozen vegetables, canned veg, grains etc.