What is the badness of MSG in cooking?

Certain individuals are definitely more sensitive to MSG (monosodium glutamate) than others. Reported affects include severe headaches including migraine headaches, flushing, rashes, heart palpitations and respiratory symptoms. However, studies have failed to determine any specific links between MSG and health problems, possibly because not all people are affected.

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Also, MSG has been shown by studies to cause brain damage in infants and is banned for use in baby foods. As for adults, excess consumption may cause headaches but no long term detrimental effects have been proven.