With the words “natural flavor” food chemists and companies can put whatever they want into our food that is “generally regarded as safe” including excitotoxins. Natural flavor can legally contain natural occurring “glutamate” bi-products like MSG – which are known excitotoxins.
Excitotoxins overexcite your cells until they die or are damaged causing “injury” and “incapacitating” you with disease. When consumed over time, excitotoxins can cause nerve disorders resulting a myriad of diseases from stroke to Alzheimer’s to Parkinson’s. And lots of other side effects too – like obesity, migraines, fatigue and depression.
Source: http://www.cbsnews.com/videos/tweaking-tastes-and-creating-cravings/