Thanks for that clarification. The few times I have had attacks were either after Asian restaurants, that Zatarain&#x27;s rice (MSG clearly indicated in the ingredients, I checked after my attack started) and my first time: Quiznos.<p>I had so few attacks, that I forget about my intolerance. Not sure if I had headaches, because I was so focused on my pseudo  heart attack! I spent 7 weeks in Vietnam and I saw MSG everywhere. Never had an attack.<p>I constantly eat parmesan, mushrooms, or tomatoes (rarely blue cheese). I have always been a &quot;jumpy&quot; person, perhaps these foods always have affected me, just slightly. Perhaps it is the time to be formally tested. Thanks again.