As everyone knows, the ingredients in packaged foods must be listed on the container. But what most don’t know is that sub-ingredients of ingredients do not have to be listed. For instance within “natural flavors” or “hydrolyzed protein” often lurks mono sodium glutamate, MSG. Somehow, most often associated with Chinese restaurants, this food additive is found in most snack foods. Some scientists are now estimating that as many as five million Americans are suffering from headaches and other symptoms caused by innocently eating MSG.