I've never found myself to have any particular food allergies with the exception of MSG. I started noticing this quite a while back. There seems to be a lot of evidence that "Chinese restuarant syndrome" is a myth:
While many people believe that monosodium glutamate (MSG) is the cause of these symptoms, an association has never been demonstrated under rigorously controlled conditions, even in studies with people who were convinced that they were sensitive to the compound. Adequately controlling for experimental bias includes a placebo-controlled double-blinded experimental design and the application in capsules because of the strong and unique after-taste of glutamates. (Wikipedia)Wow, look at all those referenced studies!
Even DBPC (double blind placebo controlled) studies indicated no MSG reactions. I decided perhaps I was just imagining things. I tried to be skeptical and objective. Yet time after time I would start to experience a racing heartbeat and a headache, only to realize I had eaten something with MSG. A big offender was Hidden Valley Ranch Dressing. I loved that stuff. When I tried to make it myself it never had the same zing as those fiendish little packets. That awesome zing, of course, was MSG. I loved you so, yet you broke my heart (well, made it race alarmingly). Nowadays, I avoid store-bought mayo, and things with labels in general, so I wouldn't be whipping up any ranch dressing that wasn't made from scratch anyway.
The Eades have this to say about MSG:
[aspartame]--along with other similar molecules, most notably MSG (monosodium glutamate), the food additive and flavor enhancer so pervasive in processed foods--behaves as a brain excitotoxin. Its chemical structure allows it to fiit into a receptor within the brain called the NMDA (N-methyl-d-aspartate) receptor, triggering such overstimulation in the nerve cell that it dies. In other words, the brain cell literally becomes excited to death. (The Protein Power LifePlan, pp 166)Oh great, just what I need, less brain cells.
So regardless of all the research apparently proving that I am imaging all this, I avoid MSG whilst still nostalgic for its savory taste. This is a classic n=1 decision. Perhaps most people really are imagining their "Chinese restaurant syndrome" but I am going to stick to what works best for me, even if it's all just a figment of my imagination. My brain cells will be grateful.