A few posts back, I mentioned NMDA receptors and excitotoxins... Here is some information:
Many of these articles are highly scientific, so read slowly. And reading up on some background about what an NMDA receptor is, how it works, and its components may have these make more sense to you. Many of the scientific, peer-reviewed articles I found, I only have access to because I am a graduate student. The general public would have to pay for them :-( This information below is available to the general public.
-GREAT book: Excitotoxins: The Taste That Kills
**Here is a shortened book review written on the text
-Here is a well-written and thought out piece with citations: NMDA Antagonists for CFS/ME and Fibromyalgia
Remember, excitotoxins are found in many of the foods and drinks you probably eat and drink. Anything "sugar free" or "diet," including diet sodas. Splenda, sweet-n-low, and equal are absolute poison to the brain. If it doesn't come from the earth, don't eat or drink it. If you can't pronounce the ingredients, don't eat or drink it.