MSG / Glutamate

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How the MSG scare began

EVIDENCEMECH 1

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Your body makes and uses the glutamate in every day, and it is the brain's main excitatory messenger. But most of the glutamate you eat is used up on its first pass through the gut wall and the liver; the brain runs on glutamate it makes on the spot. Where that road breaks is taken apart in the later chapter on how MSG helps you use less salt.

The scare began in 1968. The New England Journal of Medicine printed a reader's letter in which Robert Ho Man Kwok described numbness at the back of his neck, palpitations and weakness after eating at Chinese restaurants, and guessed that MSG (monosodium glutamate) might be the cause. It was only a short letter, with no control group, no blinding and no record of dose, but it gave the world a catchy name: "Chinese restaurant syndrome."

Today the claim that "MSG is harmful" comes in many forms: headache, asthma, facial flushing, hyperactivity in children… The list of symptoms is so wide that any meal that left you feeling off can be made to fit. This story separates where the claim came from and what the evidence actually shows, then sets out who really needs to pay attention.

Educational content, not medical advice — consult a clinician.

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