That's kinda along the lines I'm thinking. Here is a copy/paste from msgtruth.org
"Consider: If the presence of glutamate triggers a more severe histamine response than otherwise would be suffered by the unwitting allergic victim, perhaps MSG did not kill the victim directly, but was actually an accomplice. Perhaps the individual would have survived had MSG not also been in the offending food.

One has to conclude that if MSG exacerbates an already-occurring allergic reaction, then it would appear to be an extremely dangerous unnecessary food additive to place in restaurant meal."

If I'm intolerant of certain foods, which is rather possible considering my history of being allergic to many things, this excess of processed glutamate is triggering a sever histamine response, which is what is causing me to have asthma like SOB, sneezing, runny nose, and intense itching, from my neck to my ankles.
In essence, taking the intolerance and "turning" it into an allergic reaction.

I just hope I'm right this time!