The more the food is processed, the less real food and nutrition it contains. The chemicals that are added from the time food is grown, as in conventional farming, along with food processing are problematic and can contribute to a whole host of chronic illness. Then there is the issue with GMOs that have never been thoroughly studied for safety.

As far as excitotoxins are concerned, MSG and similar compounds are not good for the brain. People dealing with mood disorders and other mental illness should stay clear. Also people with dementia or children with autistic spectrum disorders along with conditions like MS or ALS. People that suffer from migraine also have sensitivity to MSG.

For foods in general, the cleaner the food is, the better. The less processed the better. The more man messes with it, the worse it gets. The convenience of our modern lifestyles have come at a high cost. The increase in chronic diseases and the fact that people are suffering from those conditions at much younger ages are screaming that things are seriously wrong. Diet is only one part of the puzzle - but a very critical piece. People often are unable to peel back the layers of illness without also addressing what they put into their bodies for food.