The Source Of The Myth
In 1968, a scientist wrote to the New England Journal of Medicine saying that he'd experienced something he decided to call "Chinese Restaurant Syndrome" after chowing down on Chinese food. He claimed he'd experienced "a numbness at the back of the neck that radiates to the arms and back," along with "general weakness and palpitation."
At the time, they decided to place the blame on the flavor additive.
But research over the next few decades didn't support the claim that a normal dose of MSG could cause the mysterious "Chinese Restaurant Syndrome" effects.
Instead, as the ACS says, the scientific consensus from that research is that "MSG can temporarily affect a select few when consumed in huge quantities on an empty stomach, but it's perfectly safe for the vast majority of people."
So, a normal person may get temporary symptoms if they eat huge quantities of the stuff without any other other food. But no normal person would consume MSG in that way — it would make as much sense as eating tablespoons of salt, and cause the same reaction.
As for glutamate itself — as the ACS explains, it's one of the 20 amino acids that make up all naturally occurring proteins. Nothing to fear, here.
http://www.businessinsider.com/is-ms...-to-eat-2014-8