I dunno, a lot of the things they complain about DO have nutritional value. Vitamins, minerals, calories from sugars. People object to high-fructose corn syrup as "unnatural" and "chemical", and that definitely has nutritional value, because it has calories. People object to MSG as "chemical", but it's the sodium salt of an essential amino acid, and provides your body with that amino acid (plus sodium, which is a very necessary mineral; it just happens to be one that most of us get an abundance of). Companies add vitamin D to milk and iodine to salt because those are essential things that many people don't get enough of, and people complain of those as being "chemicals".

Of course, many of those people don't actually understand what constitutes nutritional value, and probably think that the "chemicals" provide none at all, so from a subjective viewpoint, it works.