It is like a safe harbor provision. If you exclude processed foods and grains, then you are in a relatively safe place food-wise, though not perfectly safe of course.
If you do eat processed foods, then you take your chances or you must spend a lot of time educating yourself about various ingredients and the studies about them.
If you do eat processed foods, then you take your chances or you must spend a lot of time educating yourself about various ingredients and the studies about them.