Ingestion of processed free glutamic acid (MSG) is known to produce a variety of adverse reactions in some people. These reactions, although seemingly dissimilar, are no more diverse than reactions found as side effects of certain neurological drugs.

The most common symptoms of MSG sensitivity are headache, flushing, tingling, weakness, and stomachache. After eating meals prepared with MSG, people with MSG sensitivity may have a migraine, visual disturbance, nausea, vomiting, diarrhea, weakness, tightness of the chest, difficulty breathing, skin rash, or sensitivity to light, noise, or smells. Read the rest of this entry »