Reread my comment as this was already addressed.
I explicitly stated products other than produce and meats are in the category of foods that typically are difficult to gauge quality of.
To specifically list out the products I'm talking about, consider: milk, oatmeal, flour, snack foods, ice cream, beverages, cheese, broth/stock, prepared soups, condiments such as ketchup, cooking oils, packages of tea bags, breads, jams, and so forth.
Vegetables and meats are only slightly easier to gauge quality of because they are typically not packaged, however, anyone who cooks at home regularly can tell you that you still run the risk of getting bad produce/meats even with a close-up visual inspection.