I've been concerned about brain fogging for some time, but never knew whether it was a real effect (or just 'me') or where it came from. After doing the Elimination Diet for about 6 weeks and then the RPAH Glutamates Challenge of 4 tablespoons of soy sauce over rice, I developed quite strong brain fogging within about an hour. As a former regular eater of strong cheeses, Marmite, and soy sauce with sushi, I then understood where my brain fog problem came from! I also think that my heart rhythm issues have decreased since I've started avoiding foodstuffs with high levels of glutamates. Your website and the RPAH book and challenges led me to my answer, thank you very much! I also recently learned that when my mother got bad arthritis in the 70s or 80s, she did some research and decided MSG was probably the culprit, cut it out and the arthritis subsided.- Neil, UK

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