Article on MSG

Interesting read on MSG, Glutamic Acid and Glutamine. Thoughts?

http://www.hammernutrition.com/downloads/msg.pdf

Prior to dieting I was consuming large quantities of MSG through Fast Food. Since eliminating most MSG, or at the very least reducing my consumption of MSG greatly, I've eliminated the migraines and heart palpitations that bothered me for years. While ingesting the MSG, I believe my sodium-potassium balance was also very off.....consuming 5000-6000mgs of salt while ingesting very little potassium. Is this article postulating that dehydration magnifies MSG sensitivity?