3) Excitotoxins -- aspartame, monosodium glutamate and others (see below). These neurotoxic chemical additives directly harm nerve cells, over-exciting them to the point of cell death, according to Dr. Russell Blaylock. They're found in diet soda, canned soup, salad dressing, breakfast sausage and even many manufactured vegetarian foods. They're used to add flavor to over-processed, boring foods that have had the life cooked out of them.