If MSG is so bad for you, why doesn't everyone in Asia have a headache?

The Observer Food Magazine

What does chiefly animate Japanese soups and broths is an amino acid called glutamate. In the best ramen shops it's made naturally from boiling dried kombu seaweed; it can also come from dried shrimp or bonito flakes, or from fermented soy. More cheaply and easily, you get it from a tin, where it is stabilised with ordinary salt and is thus monosodium glutamate.
This last fact is of little interest to the Japanese - like most Asians, they have no fear of MSG. And there lies one of the world's great food scare conundrums. If MSG is bad for you - as Jeffrey Steingarten, the great American Vogue food writer once put it - why doesn't everyone in China have a headache?

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